Accessories for Central Inverter SUNNY STRING-MONITOR...

SSM16-24-IA-IEN105120 | 98-4024820 | Version 2.0 EN

Accessories for Central InverterSUNNY STRING-MONITOR SSM16-11/SSM24-11Installation Guide

SMA Solar Technology AG Table of Contents

Installation Guide SSM16-24-IA-IEN105120 3

Table of Contents1 Information on this Guide . . . . . . . . . . . . . . . . . . . . . . . . . . 82 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102.1 Appropriate Usage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102.2 Target Group Qualification . . . . . . . . . . . . . . . . . . . . . . . . . . . 102.3 Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102.4 Symbols on the Type Label and the Sunny String-Monitor . . . . 133 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143.1 Sunny String‑Monitor SSM16-11 / SSM24-11 . . . . . . . . . . . . 143.2 String Current Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143.3 String Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183.4 Overvoltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193.5 Remote Tripping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193.5.1 Remote Tripping as a Shunt Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193.5.2 Remote Tripping as Undervoltage Release . . . . . . . . . . . . . . . . . . . . . . . . . . 193.6 Type Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194 Scope of Delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.1 Sunny String-Monitor SSM16-11 . . . . . . . . . . . . . . . . . . . . . . . 204.2 Sunny String-Monitor SSM24-11 . . . . . . . . . . . . . . . . . . . . . . . 215 Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235.1 Base Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235.1.1 Selecting the Mounting Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235.1.2 Mounting the Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245.1.3 Mounting the Sunny String-Monitor on the Base. . . . . . . . . . . . . . . . . . . . . . 255.2 Wall Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265.2.1 Selecting the Mounting Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265.2.2 Mounting the Sunny String-Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Table of Contents SMA Solar Technology AG

4 SSM16-24-IA-IEN105120 Installation Guide

6 Electrical Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296.1 Overview of the Connection Area . . . . . . . . . . . . . . . . . . . . . . 296.2 Connecting the PV Strings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316.2.1 Calculating the Maximum Number of Strings per Measuring Input . . . . . . . 316.2.2 Connecting the PV Strings to Isolation Terminals. . . . . . . . . . . . . . . . . . . . . . 316.2.3 Connecting the PV Strings to the SUNCLIX DC Plug Connectors . . . . . . . . . 316.2.4 Connecting the PV Strings to Tyco, MC3, and MC4 Plug Connectors . . . . . 346.3 Connecting the DC Main Cable . . . . . . . . . . . . . . . . . . . . . . . . 346.4 Connecting the Grounding Cable. . . . . . . . . . . . . . . . . . . . . . . 356.5 Connecting the Data Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . 366.5.1 Selecting the Data Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 366.5.2 Connecting the Data Cable Shield Contact . . . . . . . . . . . . . . . . . . . . . . . . . 366.5.3 Connecting the Data Cable in the Sunny String-Monitor . . . . . . . . . . . . . . . 376.5.4 Connecting the Data Cable in the Sunny Central . . . . . . . . . . . . . . . . . . . . . 386.6 Connecting the Remote Tripping for the DC Circuit Breaker. . . 406.6.1 Dimensioning the Connection Cable for the Shunt Trip. . . . . . . . . . . . . . . . . 406.6.2 Connecting the Shunt Release. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 416.6.3 Connecting the Feedback Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 416.7 Installing the Theft Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . 427 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 437.1 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 437.2 Preparing and Carrying Out Commissioning . . . . . . . . . . . . . . 437.2.1 Requirements for Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 437.2.2 Terminating the Data Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 437.2.3 Noting the Serial Number of the Piggy-Backs for Data Processing. . . . . . . . 457.2.4 Filling In the Commissioning Report. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 457.3 Switching On the Sunny String-Monitor . . . . . . . . . . . . . . . . . . 467.4 Reconnecting the DC Circuit Breaker after Tripping . . . . . . . . . 468 Disconnecting the Sunny String-Monitor . . . . . . . . . . . . . 47



9 Configuring the Sunny String-Monitor via Sunny Central Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

9.1 Organizing the Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . 489.2 Detecting Sunny String-Monitors. . . . . . . . . . . . . . . . . . . . . . . . 489.3 Setting the Parameters for the String Current Monitoring . . . . . 509.3.1 Setting the Number of Strings per Measuring Channel . . . . . . . . . . . . . . . . 509.3.2 Setting the Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 509.3.3 Setting the Tripping Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 519.3.4 Setting the Tolerance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 519.3.5 Setting the Monitoring Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 519.3.6 Setting the Nighttime Deactivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 519.3.7 Setting the Theft Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 529.4 Reading the Measured Values . . . . . . . . . . . . . . . . . . . . . . . . . 529.4.1 Reading the Mean Values of the Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . 529.4.2 Reading the Mean Values for the Individual Measuring Channels. . . . . . . . 529.5 Reading and Confirming Messages . . . . . . . . . . . . . . . . . . . . . 529.5.1 Resetting the Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 529.5.2 Reading and Confirming Current Messages . . . . . . . . . . . . . . . . . . . . . . . . . 529.5.3 Reading and Confirming the Event History . . . . . . . . . . . . . . . . . . . . . . . . . . 52

10 Configuring the Sunny String-Monitor with Sunny Data Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

10.1 Organizing the Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . 5310.2 Detecting the Sunny String-Monitor . . . . . . . . . . . . . . . . . . . . . 5510.3 Setting Parameters for String Current Monitoring . . . . . . . . . . . 5610.3.1 Overview of the Program Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5610.3.2 Setting the Number of Strings per Measuring Channel . . . . . . . . . . . . . . . . 5710.3.3 Setting the Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5710.3.4 Setting the Monitoring Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5710.3.5 Setting the Tripping Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5810.3.6 Setting the Tolerance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5810.3.7 Setting the Nighttime Deactivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Table of Contents SMA Solar Technology AG


10.3.8 Setting the Theft Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5910.4 Reading the Measured Values . . . . . . . . . . . . . . . . . . . . . . . . . 5911 Configuring the Sunny String-Monitor with

Sunny WebBox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6011.1 Organizing the Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . 6011.2 Sunny WebBox Interface Overview . . . . . . . . . . . . . . . . . . . . . 6011.3 Detecting the Sunny Central . . . . . . . . . . . . . . . . . . . . . . . . . . . 6111.4 Detecting the Sunny String-Monitor . . . . . . . . . . . . . . . . . . . . . 6111.5 Setting the Parameters for Sunny Central Control. . . . . . . . . . . 6211.5.1 Setting the Number of Strings per Measuring Channel . . . . . . . . . . . . . . . . 6211.5.2 Setting the Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6211.5.3 Setting the Monitoring Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6311.5.4 Setting the Tripping Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6311.5.5 Setting the Tolerance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6311.6 Setting the Parameters for the Sunny Central String Monitor

Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6411.6.1 Setting the Number of Strings per Measuring Channel . . . . . . . . . . . . . . . . 6411.6.2 Setting the Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6411.6.3 Setting the Communication Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6511.6.4 Setting the Monitoring Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6511.6.5 Setting the Tripping Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6511.6.6 Setting the Tolerance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6611.7 Reading the Measured Values . . . . . . . . . . . . . . . . . . . . . . . . . 6611.7.1 Reading the Measured Values of the Groups. . . . . . . . . . . . . . . . . . . . . . . . 6611.7.2 Reading the Measured Values for the Individual

Measuring Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6611.8 Acknowledging Error Messages. . . . . . . . . . . . . . . . . . . . . . . . 6711.8.1 Acknowledging Error Messages with Sunny Central Control . . . . . . . . . . . . 6711.8.2 Acknowledging Error Messages with the Sunny Central String Monitor

Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67



12 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6812.1 LED signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6812.2 Communication and Operation Faults . . . . . . . . . . . . . . . . . . . 6913 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7013.1 Sunny String‑Monitor SSM16-11 . . . . . . . . . . . . . . . . . . . . . . . 7013.2 Sunny String‑Monitor SSM24-11 . . . . . . . . . . . . . . . . . . . . . . . 7614 Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

1 Information on this Guide SMA Solar Technology AG


1 Information on this GuideValidityThis installation guide applies to the following devices:

• Sunny String‑Monitor SSM16‑11• Sunny String-Monitor SSM24-11

Target GroupThis manual is intended for skilled workers. Only qualified personnel are allowed to perform the tasks set forth in this manual (see section 2.2 ”Target Group Qualification”, page 10).

Additional InformationAdditional information is available at www.SMA.de/en:

Utility ModelThe Sunny String-Monitor SSM 16-11 and the Sunny String-Monitor SSM24-11 have pending utility patents.

Document title Document typeProduct Details ‒ Features and Mounting Options for SUNNY STRING-MONITOR SSM 16-11

Technical Information

Product Details ‒ Features and Mounting Options for SUNNY STRING-MONITOR SSM 24-11

Technical Information

Plant communication in large-scale PV plants ‒ POSSIBILITIES OF PLANT COMMUNICATION

Technical Description

SMA Solar Technology AG 1 Information on this Guide


Symbols

Typography

NomenclatureThe manual deals with both the Sunny String‑Monitor SSM16-11 and the Sunny String‑Monitor SSM24-11 and they are referred to as the Sunny String-Monitor.

Symbol ExplanationIndicates a hazardous situation which, if not avoided, will result in death or serious injury.Indicates a hazardous situation which, if not avoided, could result in death or serious injury.Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.Indicates a situation that can result in property damage if not avoided.

Indicates information that is important for a specific topic or objective, but is not safety-relevant.

☐ Indicates a requirement for meeting a specific goal.☑ Desired result.✖ Undesired result. Followed by a solution on how to achieve the desired

result.

Typography Usage Example"light" • Information displayed on

the inverter• Elements on a software

interface• Connections

• The value can be read in the field "Energy".

bold • Elements from which you should make a selection

• Elements which you should input

• Select Settings.• Enter 10 in the "Minutes" field.

> • Several elements which you should select

• Select Settings > Date.

[Button/key] • The button or key which you should select or press

• Select [Next].

2 Safety SMA Solar Technology AG


2 Safety2.1 Appropriate UsageThe Sunny String‑Monitor is a DC sub-distributor to which several strings can be connected in parallel. The Sunny String-Monitor monitors the input current to the strings, detects failures and thus helps to minimize power and yield losses.

Figure 1: Principle of a grid-tie PV plant

2.2 Target Group QualificationAll work on the plants may only be carried out by qualified technical personnel. Qualified means that the personnel must possess training relevant to the task performed and must be familiar with the content of this manual.

2.3 Safety InstructionsFollowing InstructionsFailure to follow this manual and the operating or safety instructions it contains may lead to severe injury from electric shock.

• Only perform work as described in this manual. Observe all safety instructions.• Keep the documentation for the Sunny String-Monitor and for the installed components with the

system documentation. They must be accessible at all times.

Position DesignationA PV arrayB Sunny String-Monitor C Sunny CentralD TransformerE Power distribution grid

SMA Solar Technology AG 2 Safety


Electric ShockThe Sunny String-Monitor is connected to high voltages. Work on the Sunny String-Monitor is only allowed if the power is disconnected and in compliance with the guidelines that apply at the installation location.

• Disconnecting the device:– Remove the DC fuses in the central inverter or main DC distributor, such as the Sunny Main

Box, in a no-load condition.– Switch off the DC circuit breaker in the Sunny String-Monitor.– Only open or close the isolation terminals in the Sunny String-Monitor in a no-load condition.– Only insert or remove the fuses when wearing personal protective gear.– Only plug in or unplug the Solar Plug when no load is present.

• Ensure that the device cannot be reconnected.• Ensure that no voltage is present in the system.• Ground and short-circuit.• Cover or safeguard any adjacent live components. Protective covers must always be fitted.

If there is a grounding fault, grounded plant sections may be presumed live.• Ensure there is no voltage present before touching.

Operating a damaged Sunny String-Monitor may cause severe injury from electric shock.• The Sunny String-Monitor may only be used when it is technically faultless and safe to operate.• Operate the Sunny String-Monitor only without visible damage and check regularly for visible

damage. • Ensure that all external safety equipment is freely accessible at all times and is regularly checked

for proper functioning.

BurnsSome components, such as fuses, can become hot during operation.

• Wear safety gloves when working on the device.

2 Safety SMA Solar Technology AG


Damage to the Sunny String-MonitorIf the Sunny String-Monitor or the PV plant are handled by persons unauthorized to do so, they might sustain damage.

• Lock the Sunny String-Monitor after it has been put into operation.• Remove the keys from the door locks.• Keep the keys in a safe place.

Environmental InfluencesWhen closed, the Sunny String-Monitor carries IP54 and is thus protected from dust and water.

• Do not carry out any assembly work in rain, fog or if humidity exceeds 95%.• Close the doors of the Sunny String-Monitor after work on it is complete.

Electrostatic DischargeElectrostatic discharge can destroy electronic component parts.

• When you work on the Sunny String-Monitor or its assemblies, observe the ESD safety regulations and wear protective gloves.

• Conduct any electrostatic charges away from the electronic component parts before touching them. To do this, touch the unpainted grounded parts of the housing, the PE connection, for example.

SMA Solar Technology AG 2 Safety


2.4 Symbols on the Type Label and the Sunny String-MonitorSymbol Explanation

Warning of dangerous electrical voltage.The Sunny String-Monitor is connected to high voltages. All work on the Sunny String-Monitor must only be carried out by electrically skilled persons.Warning of hot surface.The Sunny String-Monitor can become hot during operation. Avoid contact during operation.Take note of all the documentation supplied with the Sunny String-Monitor.

CE mark.The Sunny String-Monitor complies with the requirements of the applicable EC guidelines.The Sunny String-Monitor must not be disposed of via domestic waste arrangements.

3 Product Description SMA Solar Technology AG


3 Product Description3.1 Sunny String‑Monitor SSM16-11 / SSM24-11The Sunny String‑Monitor is a DC sub-distributor to which several strings can be connected in parallel. The Sunny String-Monitor monitors the input current to the strings and detects malfunctions.

Figure 2: Structure of the Sunny String-Monitor

The string currents are monitored by the measuring board in the String Monitor Unit in the Sunny String-Monitor. A Piggy-Back is integrated in the measuring board for data processing. The data processing Piggy-Back manages the string currents and the parameterization of the measuring board.The string fuses in the Sunny String-Monitor protect the PV string modules from reverse currents.

3.2 String Current MonitoringThe string currents are monitored via the measuring board in the String Monitor Unit (SMU). The String Monitor Unit measures the string currents and continuously calculates the average currents. The SMU compares the string currents with the mean values. If a string current exceeds or falls short of the mean value by the set tolerance value, the warning 380 "SMU" is displayed.You can adjust the parameters for monitoring the string current on the Sunny Central 100/200/250/350 inverters and the Sunny Central in the HE-11 series on the integrated Sunny Central Control data logger or in the Sunny Data Control program on the PC. It is also possible to read mean values on the Sunny Central Control and in the Sunny Data Control.

Position DesignationA DoorsB Switch cabinet lock

SMA Solar Technology AG 3 Product Description


With the Sunny Central inverters in the CP and the HE-20 series, you can set the parameters on the PC via the WebBox interface and read the mean values and the messages.With the parameterization, the Sunny String-Monitor can determine the total malfunction of a string within a polling interval. Slightly elevated string currents are reliably detected in several polling intervals and distinguished from typical current fluctuations of the PV array.The following describes:

• The circumstances under which the string current is monitored• The intervals at which data is transmitted• Which parameters are important for the sensitivity with which the string current is monitored.

Requirements for Activating the String Current Monitoring☐ The DC power of the PV array exceeds 5% of the nominal AC power of the Sunny Central.

PDC > 0.05 * PAC nom

☐ The string current mean value of the individual groups is equal or greater than 0.5 A.IM String ≥ 0.5 A

Error SumThe error sum is a measure of the sensitivity of the string current monitoring. It can be parameterized via the tripping time and tolerance, and is described by the following formula:

The individual error sums of the measuring channels are reset at 00:00 o'clock.

Value DesignationPDC PV array powerPAC nom Sunny Central nominal AC power

Value DesignationIM String Mean value of string-current from each group



Polling IntervalThe Sunny String-Monitor continually measures the string currents and saves them in cycles. The data logger reads these values every 5 minutes.Tripping TimeThe tripping time is the time span between the occurrence of a fault and the error message. The tripping time is set to 180 minutes as default. You can set the parameters for the tripping time between 2 … 1440 minutes.

ToleranceThe tolerance indicates how much the string current may deviate from the mean value. When the string current is outside of the tolerance limits, the data logger detects the deviation and stores it. The tolerance can be set between 10% … 100%.

Grouping StringsYou can assign the strings to the 8 measuring channels in order to simplify monitoring. Should individual PV strings be overshadowed, aligned differently or fitted with different modules, it is also possible to group the individual measuring channels. This makes it possible to compare measuring channels with the same properties.

ComparisonEvery 5 minutes, the data logger compares the string-current with the mean value for the group. If the string-current exceeds the tolerance limit, the data logger stores the deviation. If at the next poll, there is still a deviation between the string-current and the mean value, the deviations are added together. If the sum of deviations exceeds the error sum, the data logger sends the 380 "SMU" warning. When the error is acknowledged, the error sum is reset, and the warning disappears from the display.It is possible to see from the Sunny Central Control or via the Sunny WebBox which Sunny String-Monitor and which measuring channels are deviating from the mean value for the group.

Example:

It is assumed that at time t0 the mean value of a group is 5 A. The set tolerance is 10%. This means that the tolerance range is from 4.5 A … 5.5 A. The tripping time is set to 10 minutes. The polling interval is 5 minutes. The error sum can therefore be calculated as follows:



All the string currents are now compared to this mean value in the 5 minute polling interval. If all the string currents lie within the set tolerance of 10%, no addition is carried out.If, however, a string shows a string current of 6 A, then the difference between the actual string current of 6 A and the tolerance limit of 5.5 A is added to the total. The difference is 0.5 A, which is a deviation of 10% from the mean value. This difference of 10% is now added to the total until the error sum of 20% is reached.The error sum is reached when the error remains the same for two polling intervals. The data logger sends the warning 380 "SMU".



3.3 String FusesThe string fuses protect the modules of a PV plant from reverse currents.

Figure 3: The principle of reverse currentReverse current can occur when different open-circuit voltages are applied to modules connected in parallel. In this event, the reverse current can be much higher than the module's short-circuit current. The higher the reverse current, the higher the heat will rise in the modules of the faulty PV string. Pronounced warming can destroy the modules of the faulty PV string.Reverse current can have the following causes:

• Short circuit in one or more modules• Short circuit in one or more cells in a module• Double ground fault in a module • Double ground fault in the cabling

The string fuses trip when the string current is too high and thus protect the modules of the faulty PV string. The Sunny String-Monitor informs Sunny Central Control of the failure of the PV string.In the case of grounded PV arrays, the positive or the negative pole can be grounded at the inverter. To do this, cylindrical bridges are fitted in the Sunny String-Monitor instead of fuses.

If a string fails, the current difference in the above example is 4.5 A, which equates to a deviation of 90% from the mean value. If the settings in the above example remain the same, i.e. tolerance at 10% and tripping time at 10 minutes, the error sum of 20% is already reached after the first polling interval of 5 minutes. The data logger now sends an "SMU" warning.



3.4 Overvoltage ProtectionIntegrated surge arresters provide overvoltage protection. The surge arresters protect the inverters from transient overvoltages. The integrated surge arresters can be monitored in the Sunny String-Monitor. To guarantee the functionality of the integrated surge arrester, this must be connected to an external grounding. The connection to ground is provided by a ground terminal.

3.5 Remote Tripping

3.5.1 Remote Tripping as a Shunt TripThe DC circuit breaker is fitted optionally with a remote trigger which is configured as a shunt trip.The remote trigger with the shunt trip is used to switch off the DC circuit breaker in an electrically controlled way. Action of the shunt trip is configured at a voltage between 70% … 110% of the nominal voltage of the shunt trip UN. If a voltage is present at the shunt trip, the DC circuit breaker is tripped. The DC circuit breaker is controlled via a make contact.The function of the shunt trip is not guaranteed if a cable breaks, a connection is loose, voltage is too low or the voltage supply fails. We recommend the use of an uninterrupted voltage supply. The activation time for safely activating the shunt trip is at least 3 seconds.After it has been triggered remotely, the DC circuit breaker must be connected again manually.

3.5.2 Remote Tripping as Undervoltage ReleaseThe DC circuit breaker is fitted optionally with a remote trigger which is configured as an undervoltage release.Remote tripping with the undervoltage release is used to switch off the DC circuit breaker in an electronically controlled way. The DC circuit breaker is tripped when there is no voltage at the undervoltage release, or if the voltage falls below 85% of the nominal release voltage UN. After tripping, the DC circuit breaker can be connected again after the voltage rises above 85% of the undervoltage release nominal voltage UN.In order to avoid an inadvertent tripping, we recommend an uninterrupted power supply. The undervoltage release is designed for continuous operation. Activation takes place via a normally closed contact. The minimum interruption time for reliable tripping of the undervoltage release is 1 second.After it has been triggered remotely, the DC circuit breaker must be connected again manually.

3.6 Type LabelThe purpose of the type label is to identify the Sunny String-Monitor. You will find the type label on the inside of the right door and on the right external wall of the Sunny String-Monitor. You will find the following information on the type label:

• Type (Type/Model)• Serial number (Serial No.) of the Sunny String-Monitor

4 Scope of Delivery SMA Solar Technology AG


4 Scope of Delivery4.1 Sunny String-Monitor SSM16-11Check the scope of supply for completeness and any visible external damage. Please contact your supplier if the delivery is not complete or you find any damage.

Figure 4: Sunny String-Monitor SSM16-11 - scope of delivery

Position Quantity DesignationA 1 Sunny String-Monitor SSM16-11B 1 Base*

C 1 Switch cabinet keyD 2 Mounting rail*

E 8 Screw*

F 0/16 Cylindrical bridges*

G 16/32 Fuses*

H 32/64 DC plug connector +pole*

SMA Solar Technology AG 4 Scope of Delivery


4.2 Sunny String-Monitor SSM24-11Check the scope of supply for completeness and any visible external damage. Please contact your dealer if the delivery is not complete or you find any damage.

Figure 5: Sunny String-Monitor SSM24-11 - scope of delivery

I 32/64 DC plug connector -pole*

K 32/64 Sealing plugs for DC plug connectors*

L 1 Installation guideM 1 Circuit diagram

* optional

Position Quantity DesignationA 1 Sunny String-Monitor SSM24-11B 1 Base*

C 1 Switch cabinet keyD 2 Mounting rail*

Position Quantity Designation

4 Scope of Delivery SMA Solar Technology AG


E 8 Screw*

F 0/24 Cylindrical bridges*

G 24/48 Fuses*

H 48/96 DC plug connector +pole*

I 48/96 DC plug connector -pole *

K 48/96 Sealing plugs for DC plug connectors*

L 1 Installation guideM 1 Circuit diagram

* optional

Position Quantity Designation

SMA Solar Technology AG 5 Assembly


5 Assembly5.1 Base Mounting

5.1.1 Selecting the Mounting Location

Requirements:☐ The mounting location is not an escape route, nor in a residential or office area.☐ The mounting location must be easily accessible for maintenance work.☐ The mounting location is shaded.☐ The mounting location is protected from rain as far as possible.

Danger to life due to fire or explosion.• Do not install the Sunny String-Monitor on flammable construction materials.• Do not install the Sunny String-Monitor near highly flammable materials.• Do not install the Sunny String-Monitor in potentially explosive areas.

5 Assembly SMA Solar Technology AG


Figure 6: Arrangement of the cables in the base area

5.1.2 Mounting the Base

Figure 7: Dimension of the support for the base

Position DesignationA PV+ string cableB Grounding cable, RS485 communications cable, cable for remote tripping

(optional)C DC main cable to Sunny CentralD PV‒ string cable

1 060 mm

59

5 m

m

59

5 m

m

245 mm



1. Dig a pit. Note the depth of the pit on the base. Tip: the maximum depth of the pit is marked on the sides of the Sunny String-Monitor.

2. Set the base in the pit with the side of the kick plate facing forwards.3. Remove the upper kick plate.4. Presort the output cables according to location and place in the base.5. Half-fill the pit with gravel or sand. Use a grain from 2 mm … 4 mm.

5.1.3 Mounting the Sunny String-Monitor on the Base

1. Loosen the 4 fixing screws on the bottom plate of the Sunny String-Monitor.

2. Remove the upper kick plate.

3. Place the Sunny String-Monitor on the base.4. Fix the Sunny String-Monitor to the base using the screws that were previously removed.5. Insert all the output cables through bottom plate into the Sunny Strong-Monitor, and fasten to

the internal cable support rail.6. In order to stop the kick plate from being opened by unauthorized persons, fit the two safety

bolts to the inner side of the bottom plate.

6.Penetrating moisture can lead to condensation, corrosion, and leakage currents. Using the base filler stops condensation forming.

• Fill the remaining space around the base with base filler. Use a grain from 4 mm … 8 mm.

Damage to the cable glands and plug connections due to improper transport and installation.The cable glands and plug connections protrude from the enclosure.

• When transporting and mounting the Sunny String-Monitor, ensure that the cable glands and plug connections are not damaged.



5.2 Wall Mounting

5.2.1 Selecting the Mounting Location

☐ The mounting location is not an escape route, nor in a residential or office area.☐ The mounting wall can support the weight of the Sunny String-Monitor.☐ The mounting location must be easily accessible for maintenance work.☐ Mounting location is shaded.☐ The mounting location is protected from rain as far as possible.

• Include external cable support rail.• Mount the Sunny String-Monitor so that the connection area is pointing downward.• Do not mount the Sunny String-Monitor flat on its back or leaning.• If the PV array has a stand, place the

Sunny String‑Monitor on the PV array stand in the shade.

Danger to life due to fire or explosion.• Do not install the Sunny String-Monitor on flammable construction materials.• Do not install the Sunny String-Monitor near highly flammable materials.• Do not install the Sunny String-Monitor in potentially explosive areas.



5.2.2 Mounting the Sunny String-Monitor

Required Material:• 4 screws with a diameter of 8 mm. Consider the wall properties when choosing the screws.• 4 washers• 4 screw anchors. Consider the wall properties when choosing the screw anchors.

Figure 8: SSM 16-11 dimensions

Damage to the cable glands and plug connections due to improper transport and installation.The cable glands and plug connections protrude from the enclosure.

• When transporting and mounting the Sunny String-Monitor, ensure that the cable glands and plug connections are not damaged.



Figure 9: SSM 24-11 dimensions

1. Mark the position of the holes.2. Drill the holes in the indicated positions.3. Insert the screw anchors.4. Attach the mounting rails to the

Sunny String‑Monitor with the screws supplied (torque: 15 Nm).

5. Fasten the Sunny String-Monitor to the wall or stand using suitable screws. The connection area must point downwards.

6. Make sure that the device is securely in place.

SMA Solar Technology AG 6 Electrical Connection


6 Electrical Connection6.1 Overview of the Connection Area

Figure 10: Terminals for connections

Position DesignationA Main DC cable connection, − poleB DC-string connections − poleC Grounding cable connectionD Connection for remote tripping*

* optional

E Data cable connectionF DC-string connections, +poleG Main DC cable connection, +pole

6 Electrical Connection SMA Solar Technology AG


Figure 11: View of the Sunny String-Monitor from below (example)

Figure 12: Operating status LEDs

Position DesignationA Drainage channelsB Cable entry for connecting the string +pole*

* optionally with DC connector

C Cable entry for connecting the incoming data cableD Cable entry for connecting the outgoing data cableE Cable entries for connecting to the remote tripping deviceF Cable entry for connecting the main DC cable +pole**

** optional

G Cable entry for connecting the main DC cable +poleH Cable entry for connecting the grounding cableI Cable entry for connecting the main DC cable − poleK Cable entry for connecting the main DC cable − pole**

L Cable entry for connecting the strings − pole*

Position LED MeaningA LED 1, green Digital input, optional for theft protectionB LED 2, green Surge arrester

B

A

C

D



6.2 Connecting the PV Strings

6.2.1 Calculating the Maximum Number of Strings per Measuring Input

You can connect several PV strings in parallel in the Sunny String-Monitor. The maximum number of PV strings connected in parallel depends on the adjustable tolerance and can be determined as follows:

N = maximum number of PV strings that can be connected in parallel.You can adjust the "Tolerance" parameter through the Sunny Central Control, Sunny Data Control or Sunny WebBox, depending on the type of inverter.

6.2.2 Connecting the PV Strings to Isolation Terminals1. For each cable entry, remove the filler-plugs from the cable glands.2. Guide the strings through the cable glands into the enclosure interior. Make sure polarity is

correct when doing this.3. Cut the wires to length and strip 12 mm off the insulation.4. Connect the wires to the isolation terminals. Make sure polarity is correct when doing this.5. Tighten the cable glands.

6.2.3 Connecting the PV Strings to the SUNCLIX DC Plug Connectors

Requirement:☐ There is one SUNCLIX DC plug connector for each string cable.☐ PV1-F cable is available.

C LED 3, orange Data transmissionD LED 4, red Failure of the control board

Maximum Number of StringsIf you connect more PV strings than the calculated maximum, it is not possible to detect the failure of one PV string.

• Adhere to the maximum number of PV strings which can be connected in parallel.

Position LED Meaning



Procedure:• Assemble the SUNCLIX DC plug connectors• Connect the SUNCLIX DC plug connectors to the Sunny String-Monitor

Assemble the SUNCLIX DC plug connectors

Figure 13: SUNCLIX DC plug connector

Use the following procedure to assemble each DC plug connector.

1. Cut the wire to length and strip 12 mm off the insulation.2. Guide the stripped wire all the way into the DC

plug connector. Ensure the correctness of the polarity assignment and of the type of plug.

3. Push the clamping clip downward.☑ The clamping clip snaps audibly into place.

☑ The stranded wire can be seen inside the clamping clip chamber.

Position DesignationA Negative DC plug connectorB Positive DC plug connector

+

++

++



✖ Is the stranded wire not visible in the chamber?The stranded wire is not correctly in place.• Declamp the clamping clip. To do this insert

a screwdriver with a 3.5 mm blade into the clamping clip and pry it out.

• Remove the wire and start again from step 2.4. Push the bolted connection toward the thread and

screw it tight (torque of 2 Nm).

Connect the SUNCLIX DC plug connectors to the Sunny String-Monitor1. Remove the transport plugs from all the DC plug connectors.2. Connect the assembled DC connectors to the Sunny String-Monitor.

☑ The DC connectors click audibly into position.3. Ensure that all DC connectors are securely in place.4. Insert the sealing plugs into the DC connectors that

are not required. This way you seal the DC plug connectors.

Sealing plugThe sealing plugs included in the delivery are meant only for the DC plug connectors.

• Do not insert the sealing plugs into the DC inputs on the Sunny String-Monitor.

+

1

2

+

1

2



5. Insert the DC plug connectors with sealing plugs into the remaining DC inputs on the Sunny String-Monitor. This way you seal the Sunny String-Monitor.

6.2.4 Connecting the PV Strings to Tyco, MC3, and MC4 Plug Connectors

1. Remove the sealing plugs from the plugs.2. Connect the DC plug connectors.

6.3 Connecting the DC Main Cable

Requirement:☐ The correct terminal cross section for the main DC cable has been chosen.

Terminal Cross Section for Copper Cable

Damage to the electronics due to wrong cable installation.In order for the Sunny String-Monitor and Sunny Central to work properly, EMC guidelines must be observed.

• Lay the DC main cable and the data cable separately and at a distance greater than 400 mm from one another.

Connection terminal

Number of cables

Terminal cross section Round,

single-strandRound,

multi-strandSectoral,

single-strandSectoral,

multi-strandmaximum 240 mm2

1*

* Sunny String-Monitor SSM16/24-11 with bottom plate: connection of 1 cable per DC terminal possible.

25 mm2 …50 mm2

25 mm2 …240 mm2

50 mm2 …185 mm2

35 mm2 …240 mm2

2**

** Sunny String‑Monitor SSM16/24-11 without bottom plate: connection of 2 cables per DC terminal possible.

25 mm2 …50 mm2

25 mm2 …120 mm2

50 mm2 …120 mm2

35 mm2 …120 mm2

maximum 300 mm2

1* - 150 mm2 …300 mm2

150 mm2 …185 mm2

150 mm2 …240 mm2

2** 70 mm2 70 mm2 …185 mm2

95 mm2 …185 mm2

95 mm2 …185 mm2



Terminal Cross Section of Aluminum Cable

1. Remove filler-plugs from the cable glands.2. Guide the DC main cable through the cable glands into the enclosure interior. Make sure

polarity is correct when doing this.3. Strip the main DC cable appropriately for terminal used and attach it to cage clamps. Tighten

to the torque specified.

4. Make sure that it is securely in place.5. Tighten the cable glands.

6.4 Connecting the Grounding CableTo guarantee the functionality of the integrated surge arrester, this must be connected to an external earth.Requirement:☐ Minimum cross section of the grounding cable 16 mm2

1. Remove the filler-plugs from the cable gland.2. Guide the grounding cable through the cable gland into the enclosure interior.3. Strip the grounding cable 16 mm.4. Connect the grounding cable to the ground terminal (torque: 3.5 Nm).5. Tighten the cable gland.

Connection terminal

Number of cables

Terminal cross section Round,

single-strandRound,

multi-strandSectoral,

single-strandSectoral,

multi-strandmaximum 240 mm2

1*

* Sunny String-Monitor SSM16/24-11 with bottom plate: connection of 1 cable per DC terminal possible.

25 mm2 …50 mm2

25 mm2 …240 mm2

50 mm2 …185 mm2

95 mm2 …185 mm2

2**

** Sunny String‑Monitor SSM16/24-11 without bottom plate: connection of 2 cables per DC terminal possible.

25 mm2 …50 mm2

25 mm2 …120 mm2

50 mm2 …120 mm2

50 mm2 …95 mm2

maximum 300 mm2

1* - 150 mm2 …300 mm2

150 mm2 …185 mm2

150 mm2 …240 mm2

2** 70 mm2 70 mm2 …185 mm2

95 mm2 …185 mm2

95 mm2 …185 mm2

Terminal Stripped insulation Torque240 mm² terminal 35 mm 40 Nm300 mm² terminal 45 mm 50 Nm



6. Ground the grounding cable in the vicinity of the Sunny String-Monitor, for example, with a ground rod.

6.5 Connecting the Data Cable

6.5.1 Selecting the Data Cable

The data cable of the RS485 communication and the power supply connects the Sunny String-Monitor to the Sunny Central.

• Use a shared cable of type Li2YCYv (TP) 4 x 2 x 0.5 mm for the data cable of the RS485 communication and the +55 VDC voltage supply.

6.5.2 Connecting the Data Cable Shield Contact1. Remove the filler-plugs from the cable gland.2. Guide the data cables through the cable gland into the enclosure interior.3. Remove the data cable cover.4. Loosen the thumbscrew on the shield clamp and

pull the cable through. Lay the cable shield on the shield rails as you do so.

5. Only tighten the shield clamps hand-tight. This prevents any damage to the insulation.6. Tighten the cable gland.

Damage to the electronics due to wrong cable installation.In order for the Sunny String-Monitor and Sunny Central to work properly, EMC guidelines must be observed.

• Lay the AC/DC main cable and the data cable separately and at a distance greater than 400 mm from one another.

• Lay the data cable shield in the Sunny Central and in the Sunny String-Monitor.

Maximum shield diameter 8 mm



6.5.3 Connecting the Data Cable in the Sunny String-Monitor

You can use the Sunny String-Monitor SSM as well as the Sunny String-Monitor SSM16-11 and the Sunny String-Monitor SSM24-11 for string monitoring. These have various numbers of Piggy-Backs for data processing.

• Sunny String-Monitor SSM: 1 Piggy-Back for data processing.• Sunny String‑Monitor SSM16-11: 2 Piggy-Backs for data processing.• Sunny String-Monitor 24-11: 3 Piggy-Backs for data processing.

Parallel Connection of the Data Cables• If you are using several Sunny String-Monitors, connect them in parallel. This way there

will be an incoming and an outgoing data cable at every Sunny String-Monitor. Only one incoming data cable is connected to the last Sunny String-Monitor.

Limited Number of Piggy-Backs for Data Processing per HubThe voltage supply to the measuring boards via the communication cables limits the number of Sunny String-Monitors that can be connected.

• Connect a maximum of 10 Piggy-Backs for data processing per hub.



S

Figure 14: Connection of the data cables between the Sunny String-Monitors

1. Strip 8 mm from each wire in the data cable.2. Remove the sticker from the communication terminal strip.3. Connect the wires of the data cable to the connection terminals. Observe the terminal

allocation.4. Conduct the wiring between the individual Sunny String-Monitors in a bus. Observe the terminal

allocation of the data cable.

6.5.4 Connecting the Data Cable in the Sunny CentralFor the Sunny Central 100/200/250/350 and the Sunny Central in the HE--11 series the Sunny String-Monitor data cable is connected to the hub. There are two communications connections to which up to 10 Piggy-Backs each can be connected for data processing.For the Sunny Centrals in the CP and HE-20 series the Sunny String‑Monitor can be connected to a dedicated terminal strip (please consult the installation guides for the relevant central inverters for how to connect the Sunny String-Monitors to the Sunny Centrals of the CP and HE-20 series). There are three communications connections to which up to 10 Piggy-Backs each can be connected for data processing.



Figure 15: Connection of the data cables between the Sunny Central in the HE-11 series and the Sunny String‑Monitors

1. Guide the data cable into the Sunny Central (see the installation guide for the Sunny Central in question).

2. Strip 8 mm from each wire in the data cable.3. Remove the sticker on the connection area of the hub.4. Connect the wires of the data cable to the connection terminals on the hub in accordance with

the Sunny Central circuit diagram. Observe the terminal allocation of the data cable.



6.6 Connecting the Remote Tripping for the DC Circuit Breaker

6.6.1 Dimensioning the Connection Cable for the Shunt TripThe Sunny String-Monitor optionally includes a DC circuit breaker with a remote trigger. The remote trigger consists of a shunt release and a feedback contact. The shunt release can be implemented as a shunt trip or undervoltage release.In order to achieve reliable tripping, the minimum cross section of the connection cable on the shunt trip must be determined. The choice of connection cable cross section depends on the following factors:

• The number of Sunny String-Monitors connected• The length of the cable supplying the voltage• The cable lengths between the Sunny String-Monitors connected

Figure 16: Relationship between cable length, number of Sunny String-Monitors connected and cable cross-section.

1. Determine the number of DC circuit breakers.2. Determine the greatest distance between the Sunny String-Monitors or the voltage supply and

the first Sunny String-Monitor.3. Read off the minimum cable cross section from figure 16.

Example: Dimensioning a Connection CableIn a PV plant there are 20 DC circuit breakers. The greatest distance between the Sunny String‑Monitors is 150 m.The cable cross section must be at least 4 mm2.



6.6.2 Connecting the Shunt ReleaseDepending on the order, the Sunny String-Monitor includes a DC circuit breaker with a remote trigger. In this case the DC circuit breaker is equipped with a shunt release and a feedback contact.

Requirements for the connection cable of the undervoltage release.☐ Cable cross section: at least 2.5 mm2.☐ Total cable length: 1 000 m maximum.

1. Remove the filler-plugs from the cable gland.2. Guide the connection cable through the cable gland into the enclosure interior.3. Strip the connection cable 14 mm.4. Connect the connection cable to the terminal strip

as shown in the circuit diagram.

5. Tighten the cable gland.

6.6.3 Connecting the Feedback Contact1. Remove the filler-plugs from the cable gland.2. Guide the connection cable through the cable gland into the enclosure interior.3. Strip the connection cable 11 mm.

Destruction of the shunt release due to faulty cable dimensioning.If the cable cross section is too small, the shunt release can malfunction and be destroyed.

• If the shunt release is implemented as a shunt trip, the connection cable must be correctly dimensioned (see section 6.6.1 ”Dimensioning the Connection Cable for the Shunt Trip”, page 40).

• If the shunt release is implemented as an undervoltage release, observe the requirements for the connection cable.

Line Fuse• Furnish the connection cable of the remote trigger with a suitable line fuse.



4. Connect the connection cable to the terminal strip as shown in the circuit diagram.

5. Tighten the cable gland.

6.7 Installing the Theft ProtectionOn the Sunny Central 100/200/250/350 inverters and the Sunny Central inverters in the HE‑11 series you can activate the theft protection for the PV modules via the Sunny String-Monitor. The contacts at the PV modules are connected to form a signal chain for the theft protection. Upon interruption of the signal chain, an theft warning appears in the Sunny Central Control display, and an e-mail message is sent immediately.Installation of the cable gland and wiring is carried out by the customer.

Requirement:☐ The signal chain has a maximum 300 Ohm loop resistor.

1. Implement the contacts at the PV modules as normally closed contacts and connect to form a signal chain.

2. Integrate the signaling contact for the theft protection on the String Monitor Unit into the monitoring circuit.

3. Activate the theft protection via the Sunny Central Control or via Sunny Data Control (see section 9.3.7 ”Setting the Theft Protection”, page 52 or section 10.3.8 ”Setting the Theft Protection”, page 59)

Nighttime deactivationThe theft protection only functions if the nighttime deactivation has been deactivated. If the nighttime deactivation is activated, the message is not sent until the supply voltage has been switched on again.

• Deactivate the nighttime deactivation for theft protection (see section 9.3.6 ”Setting the Nighttime Deactivation”, page 51).

SMA Solar Technology AG 7 Commissioning


7 Commissioning7.1 SafetyElectric ShockThe Sunny String-Monitor is connected to high voltages. Work on the Sunny String-Monitor is only allowed if the power is disconnected and in compliance with the guidelines that apply at the installation location.

• Disconnecting the device:– Remove the DC fuses in the central inverter or main DC distributor, such as the Sunny Main

Box, in a no-load condition.– Switch off the DC circuit breaker in the Sunny String-Monitor.– Only open or close the isolation terminals in the Sunny String-Monitor in a no-load condition.– Only insert or remove the fuses when wearing personal protective gear.– Only plug in or unplug the solar plug when no current is present.

• Ensure that the device cannot be reconnected.• Ensure that no voltage is present in the system.• Ground and short-circuit.• Cover or safeguard any adjacent live components. Protective covers must always be fitted.

7.2 Preparing and Carrying Out Commissioning

7.2.1 Requirements for CommissioningThe commissioning report must be filled out during commissioning. The commissioning report is enclosed with the Sunny Central.Requirements:☐ The DC circuit breaker is disconnected.☐ The DC main cables are connected to the inverter or DC distribution box and are activated.

There is no reverse voltage from the inverter.☐ All connections are made according to this manual (see section 6 ”Electrical

Connection”, page 29).☐ The ground underneath the Sunny String-Monitors is firm and can be walked on.

7.2.2 Terminating the Data CableIn each case, the last Sunny String-Monitor of a string and the hubs in the Sunny Central are terminated.

7 Commissioning SMA Solar Technology AG


The Sunny String-Monitors are not terminated on delivery so that they can be configured as required on site. The hubs in the Sunny Central are terminated on delivery.

Figure 17: Termination of the data cable (example)Requirement:☐ All Sunny String-Monitors on a string are connected to the RS485 bus (see section

6.5.3 ”Connecting the Data Cable in the Sunny String-Monitor”, page 37 and section 6.5.4 ”Connecting the Data Cable in the Sunny Central”, page 38).

1. Plug the jumper on the upper String Monitor Unit into the last Sunny String-Monitor of each string.

SMA Solar Technology AG 7 Commissioning


2. When the jumpers of the String Monitor Units of the other Sunny String-Monitors of the string have been plugged in, remove the jumpers.

3. Make sure that the terminating resistor at the hub in the Sunny Central is plugged into the "485 Out" RJ45 socket.

7.2.3 Noting the Serial Number of the Piggy-Backs for Data Processing

The serial number of the Piggy-Backs for data processing serves to identify the String Monitor Unit. The position of the serial number depends on the production version of the Piggy-Back for data processing.All the serial numbers of the Piggy-Backs for data processing in all the Sunny String-Monitors must be written down in the commissioning report. You need the serial numbers for detecting the Sunny String‑Monitors.

Figure 18: Possible position of the serial number

• Identify the serial numbers and note them in the commissioning report.

7.2.4 Filling In the Commissioning Report• Check the following points and document them in the commissioning report:

– Polarity of the DC voltages at the string inputs and at the DC main cables.– All strings have similar voltage values.– Check for the absence of ground faults on the strings and the DC main cables.– Inspect the screw connections visually.– Fuses correspond to the system design.

Position DesignationA Serial number on the leftB Serial number in the centre C Serial number on the right

A B C

7 Commissioning SMA Solar Technology AG


– The terminal allocation of the data cable is correct.– All protective covers are fitted.

7.3 Switching On the Sunny String-MonitorRequirement:☐ Voltage supply for the measuring boards is present.

1. Remove protective covers.

3. Replace the protective covers.4. Connect up the isolation terminals in a no-load condition.5. Activate the DC circuit breaker.

☑ On the control circuit board LEDs 1 and 2 glow green and LED 3 glows orange periodically. Theft protection and surge arrester are intact. Data cable and control circuit board are ok.

✖ On the control circuit board, are LED 1 or LED 2 not lit up, has LED 3 not lit up after 5 minutes, is LED 4 lit up and red?• See section 12 ”Troubleshooting”, page 68.

7.4 Reconnecting the DC Circuit Breaker after TrippingIf the PV array has been disconnected from the inverter with the remote trip in the Sunny String‑Monitor, you must switch the DC circuit breaker on again manually.

1. Search for the cause of the tripping, and remove it.2. Open the Sunny String-Monitor.3. Switch the DC circuit breaker manually from the tripped position to the off position.4. Switch the DC circuit breaker manually from the off position to the on position.

☑ The DC circuit breaker is switched to "On".✖ Not possible to turn the DC circuit breaker?

The shunt release is activated.• If the shunt release is a shunt trip, make sure there is no current at the shunt trip.• If the shunt release is an undervoltage release, make sure that there is a voltage at the

undervoltage release.5. Close the Sunny String-Monitor.

2.Risk of lethal electric shock.

• Disconnect the voltage from the Sunny String-Monitor before inserting the string fuses.

SMA Solar Technology AG 8 Disconnecting the Sunny String-Monitor


8 Disconnecting the Sunny String-Monitor

1. If there is a DC circuit breaker on the Sunny String-Monitor, disconnect it. This ensures that there is no current flowing through the Sunny-String-Monitor.

2. If there is no DC circuit breaker, disconnect the Sunny Central (see the installation guide for the Sunny Central).

3. If there are fuses in the Sunny Central, remove them. Use an LV/HRC fuse handle to do this.4. If there are no fuses in the Sunny Central, remove the fuses in the DC main distributor.

6. Disconnect all the DC plug connectors.

Risk of lethal electric shock.• Pay attention to the safety rules.

– Disconnecting the device– Ensure that the device cannot be reconnected– Ensure that no voltage or current is present– Cover or isolate adjacent live elements

Risk of lethal electric shock. The discharge time of the capacitors is longer than 5 minutes.• After disconnection, wait until the capacitors have discharged.

Danger of burns from touching hot component parts.• Wear gloves when working on the device.

5.Risk of lethal electric shock.

• Only open the isolation terminals in a no-load condition.

9 Configuring the Sunny String-Monitor via Sunny Central Control SMA Solar Technology AG


9 Configuring the Sunny String-Monitor via Sunny Central Control

9.1 Organizing the ConfigurationOn the Sunny Central 100/200/250/350 inverters and the Sunny Central in the HE‑11 series, you can configure the Sunny String-Monitor through the Sunny Central Control data logger. The Sunny Central Control is integrated in the central inverter.Consult the user manual for the central inverter on how to operate the Sunny Central Control and on the meaning of the keys.

9.2 Detecting Sunny String-MonitorsProcedure:

• Setting the serial interface• Detecting the Sunny String-Monitor• Updating identification of the String Monitor Units

Setting the serial interfaceParameters of the COM1 interface are predefined and factory-set:

• Medium: RS485• Baudrate: 19200 Baud• Protocol: SMA-Net

1. Select Device Set-up > Interfaces > Communication > COM1:SMUs.☑ The interface parameters appear:

2. If the parameters are not set as described above, correct them.

Password ProtectionThe installer password must be entered in order to configure the Sunny Central String-Monitor in the Sunny Central Control (please see the user manual for the central inverter).

SMA Solar Technology AG 9 Configuring the Sunny String-Monitor via Sunny Central Control


Detecting Sunny String-Monitor1. When you first detect the Sunny String-Monitor, delete any Sunny String-Monitors already

detected.• Select Device Set-up > SMUs > Devices > Registration.• Select the String Monitor Unit you want.• Select the ID submenu.• Set the ID number to 99.• Adopt all changes with the [Enter] key.

2. Select Device Set-up > SMUs > Devices > Detection.☑ The Sunny Central Control begins detection of new devices automatically.✖ Are there any problems in detecting the Sunny Central String-Monitors?

• See section 12 ”Troubleshooting”, page 68.3. Adopt the changes and save them with the [Enter] key.4. Select Device Set-up > SMUs > Devices > Registration.5. Compare the serial numbers displayed with the serial numbers you noted (see section

7 ”Commissioning”, page 43).☑ All the noted serial numbers are on the list.✖ Not all noted serial numbers are on the list?

• Start again with step 2.

Updating identification of the String Monitor UnitsTo identify the String Monitor Units in the Sunny String-Monitor, each Piggy-Back for data processing is assigned a number as an "SSM identifier". This makes troubleshooting easier, for example, in the event of a string failure, or deviating string currents. The "SSM Identifier" does not correspond to the network address which is automatically assigned upon detection. The Sunny Central Control supports up to 40 "SSM Identifiers".

1. Select Device Set-up > SMUs > Devices > Parameters.2. Select the String Monitor Unit you want.3. Select the SSM Identifier parameter.4. Give the String Monitor Unit you want a unique identification number between 1 and 40.5. Adopt all changes with the [Enter] key.



9.3 Setting the Parameters for the String Current Monitoring

9.3.1 Setting the Number of Strings per Measuring ChannelThe number of strings per channel for the eight measuring channels can be selected from 1 to 4. The default setting is "1". The maximum number of strings per channel is limited to 4.The ideal number of strings for each measuring channel is 2. Depending on the system design it is possible to connect more strings in parallel outside the Sunny String-Monitor and append them to a measuring channel (see section 6.5.3 ”Connecting the Data Cable in the Sunny String-Monitor”, page 37).In the submenu No. of Str. All you can assign all channels of the Sunny String-Monitor to a string number of 1 to 4.

1. Select Device Set-up > SMUs > Devices > Parameters.2. Select the String Monitor Unit you want.3. In the submenu No. Of Strings or No. of Str. All set the number of strings connected per

measuring channel used.

9.3.2 Setting the GroupsWith Sunny Central Control one can subdivide the individual measuring channels of the connected String Monitor Units into 3 groups, to make it possible to compare only the measuring channels which have the same properties. The groups are monitored independently of each other, and each individual measuring channel can be allocated freely to any group. An individual group must include at least 4 measuring channels.In the Group all chan. all the measuring channels of the String Monitor Unit can be assigned to a group. If you wish not to include individual channels from the String Monitor Unit in the string current monitoring, these must be assigned to the 0 group, since string current monitoring is deactivated for this group. This way, this measuring channel is not included in the mean value calculation.

1. Select Device Set-up > SMUs > Devices > Parameters.2. Select the String Monitor Unit you want.3. In the Group channel or Group all chan. submenu, set the group numbers for individual

measuring channels or for all of them.

No strings in a measuring channel• If there are no strings connected to a measuring channel, assign this channel to the

0 group (see section 9.3.2 ”Setting the Groups”, page 50).

SMA Solar Technology AG 9 Configuring the Sunny String-Monitor via Sunny Central Control


9.3.3 Setting the Tripping TimeUsing the tripping time, you can set the sensitivity of the string current monitoring, since it is included in the calculation of the error sum. The tripping time is set to 180 minutes as default.

1. Select Device Set-up > SMUs > Parameters.2. In the Error Report Time submenu, set the value in minutes.

9.3.4 Setting the ToleranceYou can use the tolerance to set the sensitivity of the string current monitoring, since it is included in the calculation of the error sum. The tolerance is set to 10% as default.Since only a clear deviation of a measuring channel from a mean value is an indication of a faulty string, whereas minor deviations can be considered normal, the tolerance value must be set accordingly high.

1. Select Device Set-up > SMUs > Parameters2. In the submenu tolerance grp, set the value per group.

9.3.5 Setting the Monitoring PeriodYou can define a monitoring period for each individual measuring channel on the Sunny String-Monitor. This allows you to filter out temporary effects such as shading on individual strings.Under Monitoring On and Monitoring Off, one can set a specific time window for all measuring channels of the Sunny String-Monitor for string current monitoring.

1. Select Device Set-up > SMUs > Devices > Parameters.2. Select the String Monitor Unit you want.3. In the submenu Monitoring (X) On and Monitoring (X) Off, one can set a specific time

window per measuring channel or for all the measuring channels of the Sunny String-Monitor.

9.3.6 Setting the Nighttime DeactivationNighttime deactivation in the Sunny Central is activated by default. Thus, the power supply to the Sunny String-Monitors is deactivated in the Sunny Central as soon as the PV voltage has been under 250 V for one hour. The supply voltage switches itself on as soon as the PV voltage reaches 250 V.If nighttime deactivation is deactivated, the supply voltage to the Sunny String-Monitor remains on at night. This means that theft protection can be activated and evaluated, see section 9.3.7 ”Setting the Theft Protection”, page 52.

1. Select Device Set-up > SMUs > Parameters.2. In the submenu SMU Overn. Shut, set the nighttime disconnection.



9.3.7 Setting the Theft ProtectionTheft protection is deactivated by default in Sunny Central Control.

1. Select Device Set-up > SMUs > Parameters.2. In the SMU Theft. submenu, set the theft protection.

9.4 Reading the Measured Values

9.4.1 Reading the Mean Values of the GroupsThe mean values of the measuring channels for each group are displayed and updated at 5 minute intervals.

• Select Device Set-up > SMUs > Measured Values and read the values.

9.4.2 Reading the Mean Values for the Individual Measuring Channels

The mean values for the individual measuring channels are updated and displayed at 5-minute intervals.

• Select Device Set-up > SMUs > Devices > Measured Values and read the values.

9.5 Reading and Confirming Messages

9.5.1 Resetting the MessagesThe individual meanings of the warnings and failures in the Sunny Central Control can be found in the Sunny Central user manual.Sunny Central Control resets messages which appear during a day automatically at midnight. These messages can be read the next day in the event history. The individual error sums of the measuring channels are reset at 00:00 o'clock.

9.5.2 Reading and Confirming Current Messages1. Select Device Set-up > SMUs > Failure > actual Failures.2. To confirm the message, select the submenu SMU Error quit. By doing this, you reset the error

sum.

9.5.3 Reading and Confirming the Event History1. Select Device Set-up > SMUs > Failure > Hist. Failures.2. To confirm the message, select the submenu SMU Error quit. By doing this, you reset the error

sum.

SMA Solar Technology AG 10 Configuring the Sunny String-Monitor with Sunny Data Control


10 Configuring the Sunny String-Monitor with Sunny Data Control

10.1 Organizing the ConfigurationFor the Sunny Central 100/200/250/350 inverters and the Sunny Central of the HE‑11 series, you can configure the Sunny String-Monitor with the Sunny Data Control program.Sunny Data Control is a PC program by SMA Solar Technology AG with which you can store your PV plant data in the long term and visualize it. Sunny Data Control can be downloaded free from www.SMA.de/en (For information on how to use Sunny Data Control, see the Sunny Data Control user manual at www.SMA.de/en).

If you re-install Sunny Data Control on your PC, default values are set for this new version. To allow communication with Sunny Central Control, these values must be modified as follows:

Sunny Data Control Version• Use Sunny Data Control up to version 3.9.3 to configure the Sunny String-Monitor.

Password ProtectionIn order to change parameters, entering the installer password is required. Contact the SMA Serviceline about this (please see the user manual for Sunny Data Control at www.SMA.de/en for information about password protection).

Property Default value Value for Sunny Central ControlChannel request 10 s 200 sStorage time request 10 s 200 sDetection Find First 5 s 10 sDetection Find Next 7 s 10 s

10 Configuring the Sunny String-Monitor with Sunny Data Control SMA Solar Technology AG


Figure 19: Window for setting of required values

1. Choose Options > Settings ☑ The "Settings" window opens.

2. In the tree structure, select Timing.3. In the "Properties" area, select Meanval Request > Channel Request.4. In the box "Value", enter 200.5. In the "Properties" area, select Meanval Request > Storage Time Request.6. In the box "Value", enter 200.7. In the "Properties" area, select Device Detection > Detection Find First.8. In the box "Value", enter 10.9. In the area "Settings", select Device Detection > Detection Find Next.

10. In the box "Value", enter 10.11. Select [OK].

Position DesignationA Tree structureB "Settings" areaC Parameters to be setD "Value" fieldE [OK] button



10.2 Detecting the Sunny String-Monitor

Figure 20: Buttons and input windows for configuring the Sunny String-Monitor

Requirement:☐ Piggy-Backs for data processing are detected in Sunny Central Control (see section

9.2 ”Detecting Sunny String-Monitors”, page 48).

1. Select [Search].☑ Sunny Data Control starts detecting new devices.✖ Are there any problems in detecting the Sunny Central String-Monitors?

• See Section .12 ”Troubleshooting”, page 682. Compare the serial numbers detected in the plant tree with the serial numbers noted down

(see section 7 ”Commissioning”, page 43).☑ All serial numbers that were noted down are in the plant tree.

Position DesignationA [Search] button to detect devicesB Labeling of the String-Monitor with the serial number of the piggy-back for

data processing in the plant treeC "Parameters" tabD "Parameters" areaE "Channel value" areaF [Set] button



✖ Not all indicated serial numbers are on the system tree?• Start again with step 2.

3. Adapt the identification process for each String Monitor Unit.• Select the String Monitor Unit you want.• In the "Parameters" area, select SSM Identifier.• In the "Channel Value" area, enter a unique identification number between 1 and 40.• Select [Set]. This saves the setting.

10.3 Setting Parameters for String Current Monitoring

10.3.1 Overview of the Program Window

Figure 21: Buttons and input windows for parameterization of the Sunny String-Monitor

Position DesignationA Second-tier designation of the device in the plant treeB Labeling of the String Monitor Unit with the serial number of the Piggy-Back

for data processing in the plant treeC "Parameters" tabD "Parameters" areaE "Channel value" areaF [Set] button



10.3.2 Setting the Number of Strings per Measuring ChannelThe number of strings per channel for the eight measuring channels can be selected from 1 to 4. The default setting is "1". The maximum number of strings per channel is limited to 4.The ideal number of strings for each measuring channel is 2. Nevertheless one can, depending on the system design, connect more strings in parallel outside the Sunny String-Monitor and append them to a measuring channel (see section 6.5.3 ”Connecting the Data Cable in the Sunny String-Monitor”, page 37).In the submenu No. of Str. All you can assign all channels of the Sunny String-Monitor to a string number of 1 to 4. This avoids having to set the number of strings for each of the individual channels, since this is automatically set for all the individual channels.

1. Select the String Monitor Unit you want in the plant tree.2. In the "Parameters" area, click No. Of Strings for the desired channel, or No. of Str. All.3. In the area "Channel value", enter the number of PV strings per channel or for all channels.4. Select [Set]. This saves the setting.

10.3.3 Setting the GroupsYou can subdivide the individual measuring channels of the connected String Monitor Units into 3 groups, to make it possible to compare the measuring channels which have the same properties. The groups are monitored independently of each other, and each individual measuring channel can be allocated freely to any group. An individual group must include at least 4 measuring channels.In the Group all chan. all the measuring channels of the String Monitor Unit can be assigned to a group. This avoids having to allocate the individual measuring channels to a group as this then occurs automatically for all the individual measuring channels.If you wish not to include individual channels from the String Monitor Unit in the string current monitoring, these must be assigned to the 0 group, since string current monitoring is deactivated for this group. This way, this measuring channel is not included in the mean value calculation.

1. Select the String Monitor Unit you want in the plant tree.2. In the "Parameters" area, select Group channel for the desired channel, or Group all chan.3. In the area "Channel value", enter the number the group per channel of for all channels.4. Select [Set]. This saves the setting.

10.3.4 Setting the Monitoring PeriodYou can define a monitoring period for each individual measuring channel on the Sunny String-Monitor. This allows you to filter out temporary effects such as shading on individual strings.



Under Monitoring On and Monitoring Off, one can set a specific time window for all measuring channels of the Sunny String-Monitor for string current monitoring.

1. Select the String Monitor Unit you want in the plant tree.2. In the area "Parameter", Monitoring (X) On for the desired channel or Monitoring On for the

complete Sunny String-Monitor.3. In the area "Channel value" enter the desired time of day starting at which the measuring

channel or the Sunny String-Monitor should be monitored.4. Select [Set]. This saves the setting.5. In the area "Parameter", select Monitoring (X) Off for the desired channel or Monitoring Off

for the complete Sunny String-Monitor.6. In the area "Channel value" enter the desired time of day up to which the measuring channel or

the Sunny String-Monitor should be monitored.7. Select [Set]. This saves the setting.


1. Select the device on the second tier of the plant tree.2. In the area "Parameters", select SMU_Error Report Time.3. In the area "Channel value" enter the desired value in minutes.4. Select [Set]. This saves the setting.

10.3.6 Setting the ToleranceUsing the tolerance, you can set the sensitivity of the string current monitoring, since it is included in the calculation of the error sum. The tolerance is set to 10% as default.

1. Select the device on the second tier of the plant tree.2. In the "Parameters" area, select SMU_ToleranceGrp for the required group.3. In the area "Channel value" enter the desired value in percent.4. Select [Set]. This saves the setting.

10.3.7 Setting the Nighttime Deactivation1. Select the device on the second tier of the plant tree.2. In the "Parameters" area, click on SMU_Nachtab.3. In the area "Channel value", select On or Off from the drop-down list.4. Select [Set]. This saves the setting.



10.3.8 Setting the Theft Protection1. Select the device on the second tier of the plant tree.2. In the area "Parameter", select SMU_Diebstahl.3. In the area "Channel value", select On or Off from the drop-down list.4. Select [Set]. This saves the setting.

10.4 Reading the Measured ValuesSunny Data Control offers various methods for displaying the current measured values (for information about options for displaying values, please see the user manual for Sunny Data Control at www.SMA.de/en).

Figure 22: Program window for reading spot values (example)

Position Designation ExplanationA "Spotvalues" tab -B Sunny String-Monitor window with the

list of spot valuesThe window shows the list of spot values.

C Sunny Central Control window with the list of spot values

The window shows the mean values of the measuring channels for each group.

11 Configuring the Sunny String-Monitor with Sunny WebBox SMA Solar Technology AG


11 Configuring the Sunny String-Monitor with Sunny WebBox

11.1 Organizing the ConfigurationWith the Sunny Central inverters in the CP series or Sunny Central in the HE-20 series, the string currents are analyzed with the Sunny Central String-Monitor Controller.With the Sunny Central 100/200/250/350 inverters or Sunny Central in the HE-11 series, the string currents are analyzed with Sunny Central Control.Sunny String-Monitors in the Sunny Central 100/200/250/350 inverters or Sunny Central in the HE-11 series are detected through Sunny Central Control (see section 9.2 ”Detecting Sunny String-Monitors”, page 48). Sunny String-Monitors in the Sunny Central inverters in the CP series or Sunny Central in the HE-20 series can be identified through the Sunny WebBox.Setting parameters and confirming error messages depends on the type of central inverter and the type of data logger.

11.2 Sunny WebBox Interface Overview

Figure 23: Navigation bar and areas of the Sunny WebBox interface

Position DesignationA Navigation barB Plant TreeC Content area with tabs

SMA Solar Technology AG 11 Configuring the Sunny String-Monitor with Sunny WebBox


11.3 Detecting the Sunny Central1. Access the Sunny WebBox interface.2. Enter installer's password and confirm with [Login].3. Detect Sunny Central:

• Select "Detection" in the Navigation bar.• In the "Total number of devices to be detected" field, enter 1.• Select [Start detection].☑ The Sunny WebBox starts detecting all the devices and displays its progress. The message

"Device detection finished" is displayed.4. Select [OK].

11.4 Detecting the Sunny String-Monitor1. Select the "Parameters" tab.2. When you detect Sunny String‑Monitors for the first time, delete any that have already been

detected:• In the "DevFunc" parameter, select DelAll_SSMU.• Select [Save].

3. In the "DevFunc" parameter, select AutoDetect_SSMU.4. Select [Save].

☑ The message "Parameters changed successfully" is displayed.5. Select [OK].6. Select the "Spot values" tab.7. Check the number of String Monitor Units detected in the parameter field "SSMUNoOF".

☑ All the String Monitor Units have been detected.✖ Not all the Sunny String-Monitor units have been detected?

• Select the "Parameters" tab.• In the "DevFunc" parameter, select DetectSSMURetry.• Proceed with step 4.

8. Select "Detection" in the Navigation bar.9. In the "Total number of devices to be detected" field, enter the number of the String Monitor Units.

10. Select [Start detection].☑ The Sunny WebBox starts detecting all the devices and displays its progress. The message

"All devices found" is displayed.✖ Is it taking too long to detect the Sunny String-Monitors?

• See Section 12 ”Troubleshooting”, page 68.



11. Select [OK].12. Adapt the identification process for each String Monitor Unit.

• Select the required String Monitor Unit in the plant tree.• Select the "Parameters" tab.• Enter a value between 1 and 40 in the parameter field "SSM Identifier".• Select [Save].

11.5 Setting the Parameters for Sunny Central Control

11.5.1 Setting the Number of Strings per Measuring ChannelThe number of strings per channel for the eight measuring channels can be selected from 1 to 4. The default setting is "1". The maximum number of strings per channel is limited to 4.The ideal number of strings for each measuring channel is 2. Nevertheless one can, depending on the system design, connect more strings in parallel outside the Sunny String-Monitor and append them to a measuring channel (see section 6.5.3 ”Connecting the Data Cable in the Sunny String-Monitor”, page 37).With the parameter "No.of Strings" you can assign all the measuring channels of the Sunny String‑Monitor to a string number of 1 to 4. This avoids having to set the number of strings for each of the individual channels, since this is automatically set for all the individual channels.1. Select the String Monitor Unit you want in the plant tree.2. Select the "Parameters" tab.3. Enter the number of PV strings per measuring channel in the parameter fields "No.of Strings 1"

to "No.of Strings 8" or enter the number of PV strings for all the measuring channels in the "No.of Strings" field.

4. Select [Save].

11.5.2 Setting the GroupsSunny Central Control allows the individual measuring channels to be subdivided into 4 groups, to make it possible to compare only those measuring channels which have the same properties.You can assign all the measuring channels to one group in the field of the "Group String" parameter.If you wish not to include individual channels from the String Monitor Unit in the string current monitoring, these must be assigned to the 0 group, since string current monitoring is deactivated for this group. This way, this measuring channel is not included in the mean value calculation.1. Select the String Monitor Unit you want in the plant tree.2. Select the "Parameters" tab.3. Enter the number of the group for each measuring channel in the parameter fields

"Group String 1" to "Group String 8" or in the "Group String" parameter field, enter the number of the group for all the measuring channels.

4. Select [Save].



11.5.3 Setting the Monitoring PeriodYou can define a monitoring period for every measuring channel. This allows you to filter out temporary effects such as shade on the group of PV strings.You can set a monitoring period for all the measuring channels in the parameter field "Monitoring On" and "Monitoring Off".

1. Select the String Monitor Unit you want in the plant tree.2. Select the "Parameters" tab.3. In the parameter fields "Monitoring 1 On" to "Monitoring 8 On" or "Monitoring On" set the start

of the monitoring period for each measuring channel or all the measuring channels.4. In the parameter fields "Monitoring 1 Off" to "Monitoring 8 Off" or "Monitoring Off", set the end

of the monitoring period for each measuring channel or all the measuring channels.5. Select [Save].


1. Select the required Sunny Central Control in the plant tree.2. Select the "Parameters" tab.3. In the parameter field "SMU_T_Ausl." enter the tripping time in minutes.4. Select [Save].

11.5.5 Setting the ToleranceYou can use the tolerance to set the sensitivity of the string current monitoring, since it is included in the calculation of the error sum.Since only a clear deviation of a measuring channel from a mean value is an indication of a faulty string, whereas minor deviations can be considered normal, the tolerance value should be set accordingly high.

1. Select the required Sunny Central Control in the plant tree.2. Select the "Parameters" tab.3. Enter the tolerance value in percent for the groups in the parameter fields

"SMU_tolerance grp1" to "SMU_tolerance grp3".4. Select [Save].



11.6 Setting the Parameters for the Sunny Central String Monitor Controller

11.6.1 Setting the Number of Strings per Measuring ChannelThe number of strings per channel for the eight measuring channels can be selected from 1 to 4. The default setting is "1". The maximum number of strings per channel is limited to 4.The ideal number of strings for each measuring channel is 2. Nevertheless one can, depending on the system design, connect more strings in parallel outside the Sunny String-Monitor and append them to a measuring channel (see section 6.5.3 ”Connecting the Data Cable in the Sunny String-Monitor”, page 37).With the parameter "No.of Strings" you can assign all the measuring channels of the Sunny String-Monitor to a string number of 1 to 4. This avoids having to set the number of strings for each of the individual channels, since this is automatically set for all the individual channels.

1. Select the String Monitor Unit you want in the plant tree.2. Select the "Parameters" tab.3. In parameter fields "No.of Strings 1" to "No.of Strings 8" enter the number of PV strings per

measuring channel or in the field "No.of Strings" the number of PV strings for all the measuring channels.

4. Select [Save].

11.6.2 Setting the GroupsSunny Central Control allows the individual measuring channels to be subdivided into 4 groups, to make it possible to compare only those measuring channels which have the same properties.You can assign all the measuring channels to one group in the field of the "Group String" parameter.If you wish not to include individual channels from the String Monitor Unit in the string current monitoring, these must be assigned to the 0 group, since string current monitoring is deactivated for this group. This way, this measuring channel is not included in the mean value calculation.

1. Select the String Monitor Unit you want in the plant tree.2. Select the "Parameters" tab.3. Enter the number of the group for each measuring channel in the parameter fields

"Group String 1" to "Group String 8" or in the "Group String" parameter field, enter the number of the group for all the measuring channels.

4. Select [Save].



11.6.3 Setting the Communication PeriodThe communication period is the time period during which the Sunny Central String-Monitor Controller communicates with the Sunny String-Monitors. The communication period is set to 10:00 a.m. to 3:00 p.m. by default.

1. Select the Sunny Central String Monitor Controller you want in the plant tree.2. Select the "Parameters" tab.3. Set the communication period in the parameter fields "MoniTmComOn" und "MoniTmComOff".4. Select [Save].

11.6.4 Setting the Monitoring PeriodYou can define a monitoring period for each of measuring channels. This allows you to filter out temporary effects such as shade on the group of PV strings. The monitoring period is set to 10:00 a.m. to 3:00 p.m. by default.You can set the monitoring period for all the groups in the parameter fields "MoniTmGrAllOn" und "MoniTmGrAllOff".

1. Select the Sunny Central String Monitor Controller you want in the plant tree.2. Select the "Parameters" tab.3. Set the start time for the monitoring period for each group or for all the groups in the parameter

fields "MoniTmGr1On" to "MoniTmGr6On" or "MoniTmGrAllOn".4. Set the end time for the monitoring period for each group or for all the groups in the parameter

fields "MoniTmGr1Off" to "MoniTmGr6Off" or "MoniTmGrAllOff".5. Select [Save].


1. Select the Sunny Central String Monitor Controller you want in the plant tree.2. Select the "Parameters" tab.3. Enter the tripping time for each group in the parameter fields "TrgTmGr1" to "TrgTmGr6" in

minutes.4. Select [Save].



11.6.6 Setting the ToleranceYou can use the tolerance to set the sensitivity of the string current monitoring, since it is included in the calculation of the error sum. The default tolerance setting for each group is 13%.Since only a clear deviation of a measuring channel from a mean value is an indication of a faulty string, whereas minor deviations can be considered normal, the tolerance value must be set accordingly high.

1. Select the Sunny Central String Monitor Controller you want in the plant tree.2. Select the "Parameters" tab.3. Enter the tolerance value for the groups in percent in the parameter fields "TolGr1" to "TolGr6".4. Select [Save].

11.7 Reading the Measured Values

11.7.1 Reading the Measured Values of the Groups1. Access the Sunny WebBox interface.2. Enter the user password and confirm with [Login].3. Select the Sunny Central String Monitor Controller you want in the plant tree.4. Read off the mean values for the groups on the "Spot values" tab.

11.7.2 Reading the Measured Values for the Individual Measuring Channels

1. Access the Sunny WebBox interface.2. Enter the user password and confirm with [Login].3. Select the String Monitor Unit you want from the plant tree.4. Read the mean values for the individual measuring channels on the "Spot values" tab.



11.8 Acknowledging Error Messages

11.8.1 Acknowledging Error Messages with Sunny Central Control1. Access the Sunny WebBox interface.2. Enter the user password and confirm with [Login].3. Select the Sunny Central Control you want in the plant tree.4. Select the "Parameters" tab.5. Select Quit in the drop-down list for the "SMU_QuitSMU" parameter.6. Select [Save]. You have acknowledged the current error message.

11.8.2 Acknowledging Error Messages with the Sunny Central String Monitor Controller

1. Select the Sunny Central String Monitor Controller you want in the plant tree.2. Select the "Parameters" tab.3. Select Quit in the drop-down list for the "Ackn" parameter.4. Select [Save]. You have acknowledged the current error message.

12 Troubleshooting SMA Solar Technology AG


12 Troubleshooting12.1 LED signalsSymptom Cause Corrective measuresLED not lighting up. Problems with the power supply • Check the +55 V power

supply at the connection area of the Sunny String-Monitor in question.

LED 1 does not glow. Theft protection is activated. • Check the wiring of the theft protection.

LED 2 does not glow. Surge arrester has tripped. • Replace a defective protection module in the surge arrester.

LED 3 does not light up for more than 5 minutes.

Problems with the data cable • Check data cable between Sunny Central and Sunny String-Monitor, and between the individual Sunny String-Monitors.

LED 4 glows red. Failure of the control board of the string current monitoring

• Contact the SMA Serviceline.

SMA Solar Technology AG 12 Troubleshooting


12.2 Communication and Operation FaultsSymptom Cause Corrective measuresProblems in detecting the Sunny String-Monitor

The Piggy-Back for data processing is either missing or it is not properly plugged in.The COM1 interface is not configured properly.

The data cable in the last Sunny String-Monitor of a string is not terminated.

Problems with Sunny Central Control

• Check that the Piggy-Back on the String Monitor Unit is correctly plugged in.

• Check that the COM1 in the Sunny Central Control is correctly configured (see section ”Setting the serial interface”, page 48).

• Check termination in the last Sunny String-Monitor. The jumper on the last String Monitor Unit of a string must be plugged in (see section 7.2.2 ”Terminating the Data Cable”, page 43).

• Check that the jumper has been removed from the other String Monitor Units in the individual Sunny String-Monitors.

• Check that the bridge (PIN 7 – 9) at the side of the Sunny Central Control is mounted.

• Check that the COM1 at the Sunny Central Control is equipped with an RS485 Piggy-Back.

The Sunny String-Monitor is not launching and the ready indicator on a surge arrester module is red.

The surge arrester module is defective.

• Disconnect the SSM and replace the defective module.

13 Technical Data SMA Solar Technology AG


13 Technical Data13.1 Sunny String‑Monitor SSM16-11Enclosure

Mechanical Data Base

Mechanical Data Enclosure

General Data

Outdoor installation ShadedUV resistance YesBase installation*

* optional

YesWall mounting* YesMaterial Glass-fiber reinforced plasticCombustion properties Self extinguishing, halogen-freeColor RAL7035Protective insulation YesLock cylinder (double-bit) with switch cabinet key**

** prepared for customer mounting

Yes

Cable support rail***

***only for base mounting

Yes

Width x height x depth 1 060 mm x 894 mm x 245 mmInstallation depth of the base 595 mmWeight 16 kgTotal weight, enclosure and base 86 kg

Width x height x depth 1 060 mm x 820 mm x 245 mmWeight 70 kg

DC circuit breaker*

* direct drive

280 ATolerable contamination**

** according to DIN EN 50178:1997

2

SMA Solar Technology AG 13 Technical Data


Input Data at 40 °C Ambient TemperaturePV array configuration Negative or positive grounded, isolatedMaximum permissible DC voltage for 10 A, 12 A, 16 A and 20 A string fuse

UDC 1 000 V

Maximum permissible DC voltage for 5 A string fuse

UDC 950 V

Maximum permissible DC current IDC 280 ANumber of measuring inputs 16Maximum number of connections per measuring input*

* optional

2

Possible string fuses 10 A / 12 A / 16 A / 20 A / 25 AMaximum string current per measuring input for 10 A string fuse**

** reduction factor 0.7

7 A

Maximum string current per measuring input for 12 A string fuse**

8.4 A


11.2 A


14 A


17.5 A

Measurement voltage supply 35 VDC … 55 VDC



Input Data at 50 °C Ambient TemperaturePV array configuration Negative or positive grounded, isolatedMaximum permissible DC voltage for 10 A, 12 A, 16 A and 20 A string fuse

UDC 1 000 V

Maximum permissible DC voltage for 25 A string fuse

UDC 950 V

Maximum permissible DC current IDC 260 ANumber of measuring inputs 16Maximum number of connections per measuring input*

* optional

2

Possible string fuses 10 A / 12 A / 16 A / 20 A / 25 AMaximum string current per measuring input for 10 A string fuse**


6.5 A


7.8 A


10.4 A


13 A


16.25 A

Measurement voltage supply 35 VDC … 55 VDC



DC Main Connection

DC String Connection to MC4 Plug Connector


DC String Connection to Plug Connector SUNCLIX

DC String Connection to Disconnection and Measurement Terminal

Type of terminal Cage clampMaximum connection cross section 240 mm2 / 300 mm2

Suitable connector material Copper/aluminumNumber of connection terminals per DC output*

* Sunny String-Monitor SSM16-11 with bottom plate: connection of 1 cable per DC terminal possible. Sunny String‑Monitor SSM16-11 without bottom plate: connection of 2 cables per DC terminal possible.

1 / 2

Cable entry via cable gland M40Cable gland clamping zone 13 mm … 32 mm

Cable cross section 6 mm2

Maximum rated current 30 A



Cable type PV1-FCable cross section 2.5 mm2 … 6 mm2

Cable diameter 5 mm … 8 mmMaximum rated current 40 A

Type of terminal Spring terminalMaximum connection cross section 0.2 mm2 … 6 mm2

Cable entry via multiple cable gland M50Grip range of multiple cable gland 5.0 mm … 5.5 mm / 5.6 mm … 6.0 mm /

6.1 mm … 7.0 mm / 7.1 mm … 8.0 mm / 8.1 mm … 9.0 mm



Grounding Connection

Connecting the Communication

Remote tripping with shunt trip (optional)

Remote Tripping with Undervoltage Release (optional)

Connection Remote Tripping (optional)

Type of terminal Cage clampMaximum connection cross section 35 mm2

Cable gland M25Sealing range 7 mm … 14 mm

Type of terminal Spring terminalConnection cross-section 0.08 mm2 … 2.5 mm2

Cable gland M25Sealing range 7 mm … 14 mmCable type 4 mm x 2 mm x 0.5 mm Li2YCYv (TP)Number of shield clamps 2 Maximum shield diameter 8 mm

Nominal voltage 220 VAC … 240 VACExtended operating range − 30% … +10%Nominal frequency 50 Hz / 60 HzPower consumption 100 VA






Feedback Contact with Remote Tripping (optional)

Connection Feedback Contact (optional)

Protection Rating and Ambient Conditions

Interfaces

Nominal voltage 250 VAC/DCNominal current 5 AAC / 0.15 ADCFormat Inverter

Type of terminal Spring terminalMaximum connection cross section 0.25 mm2 … 2.5 mm2


Protection rating*

* according to DIN EN 60529

IP 54Permissible ambient temperatures TAMB − 25 °C … +50 °CRelative air humidity 15% … 95%Maximum altitude above sea level, MSL 1 000 m

Communication RS485Transmission rate 19 200 BaudMonitored surge arrester type II YesString current measurement Yes



13.2 Sunny String‑Monitor SSM24-11

Mechanical Data Base

Mechanical Data Enclosure

General Data

Outdoor installation ShadedUV resistance YesBase installation*

* optional

YesWall mounting* YesMaterial Glass-fiber reinforced plasticCombustion properties Self extinguishing, halogen-freeColor RAL7035Protective insulation YesLock cylinder (double-bit) with switch cabinet key**

** prepared for customer mounting

Yes

Cable support rail***

***only for base mounting

Yes

Width x height x depth 1 060 mm x 894 mm x 245 mmInstallation depth of the base 595 mmWeight 16 kgTotal weight, enclosure and base 96 kg

Width x height x depth 1 060 mm x 1 085 mm x 245 mmWeight 80 kg

DC circuit breaker*

* direct drive

320 ATolerable contamination**

** according to DIN EN 50178:1997

2



Input Data at 40 °C Ambient TemperaturePV array configuration Negative or positive grounded, isolatedMaximum permissible DC voltage UDC 1 000 VMaximum permissible DC current IDC 320 ANumber of measuring inputs 24Maximum number of connections per measuring input*

* optional

2

Possible string fuses 10 A / 12 A / 16 A / 20 AMaximum string current per measuring input for 10 A string fuse

7 A



8.4 A


11.2 A

Maximum string current per measuring input for 20 A string fuse***

***reduction factor 0.665

13.3 A

measuring voltage supply 35 VDC … 55 VDC



Input Data at 50 °C Ambient Temperature

DC Main Connection

PV array configuration Negative or positive grounded, isolatedMaximum permissible DC voltage UDC 1 000 VMaximum permissible DC current IDC 312 ANumber of measuring inputs 24Maximum number of connections per measuring input*

* optional

2

Possible string fuses 10 A / 12 A / 16 A / 20 AMaximum string current per measuring input for 10 A string fuse**


6.5 A


7.8 A


10.4 A


13.0 A

measuring voltage supply 35 VDC … 55 VDC

Type of terminal Cage clampMaximum connection cross section 240 mm2 / 300 mm2

Suitable connector material Copper / aluminumNumber of connection terminals per DC output*

* Sunny String-Monitor SSM24-11 with bottom plate: connection of 1 cable per DC terminal possible. Sunny String-Monitor SSM24-11 without bottom plate: connection of 2 cables per DC terminal possible.

1 / 2






DC String Connection to Plug Connector SUNCLIX

DC String Connection to Spring-Type Terminal

DC String Connection to Disconnection and Measuring Terminal

Grounding Connection





Cable type PV1-FCable cross section 2.5 mm2 … 6 mm2

Cable diameter 5 mm … 8 mmMaximum rated current 40 A

Grip range 0.2 mm2 … 6 mm2

Cable gland M32Cable support sleeve 3 x 5 mm / 3 x 7 mm / 3 x 9 mm


Cable entry via multiple cable gland M50Grip range of multiple cable gland 5.0 mm … 5.5 mm / 5.6 mm … 6.0 mm /

6.1 mm … 7.0 mm / 7.1 mm … 8.0 mm / 8.1 mm … 9.0 mm

Type of terminal Cage clampMaximum connection cross section 35 mm2




Connecting the Communication

Remote Tripping with Shunt Trip (optional)

Remote Tripping with Undervoltage Release (optional)

Connection Remote Tripping (optional)

Feedback Contact with Remote Tripping (optional)


Cable entry via cable gland M25Cable gland clamping zone 7 mm … 14 mmRecommended cable type 4 mm x 2 mm x 0.5 mm Li2YCYv (TP)Number of the provided contactable shield clamps*

* maximum shield diameter: 8 mm

2

Nominal voltage 220 VAC … 240 VACExtended operating range –30% … +10%Nominal frequency 50 Hz / 60 HzPower consumption 100 VA




Nominal voltage 250 VAC/DCNominal current 5 AAC / 0.15 ADCFormat Inverter



Connection Feedback Contact (optional)

Protection Rating and Ambient Conditions

Interfaces



Protection rating*

* according to DIN EN 60529

IP 54Permissible ambient temperatures TAMB − 25 °C … +50 °CRelative air humidity 15% … 95%Maximum altitude above sea level, MSL 1 000 m

Communication RS485Transmission rate 19 200 BaudMonitored surge arrester type II YesString current measurement Yes

14 Contact SMA Solar Technology AG


14 ContactIf you have technical problems concerning our products, please contact our Serviceline. We require the following information in order to provide you with the necessary assistance:

• Sunny String-Monitor type• Serial number of the Sunny String-Monitor• Type and number of the PV modules connected• Type of communication• Fault or warning number displayed• Display of the Sunny Central

SMA Solar Technology AG Sonnenallee 134266 Niestetal, Germanywww.SMA.de

SMA ServicelineTel. +49 561 9522 299Fax +49 561 9522 3299 E-Mail: [email protected]

SMA Solar Technology AG Legal Restrictions


The information contained in this document is the property of SMA Solar Technology AG. Publishing its content, either partially or in full, requires the written permission of SMA Solar Technology AG. Any internal company copying of the document for the purposes of evaluating the product or its correct implementation is allowed and does not require permission.

Exclusion of liabilityThe general terms and conditions of delivery of SMA Solar Technology AG shall apply.The content of these documents is continually checked and amended, where necessary. However, discrepancies cannot be excluded. No guarantee is made for the completeness of these documents. The latest version is available online at www.SMA.de or from the usual sales channels.Guarantee or liability claims for damages of any kind are excluded if they are caused by one or more of the following: • Damages during transportation• Improper or inappropriate use of the product• Operating the product in an unintended environment• Operating the product whilst ignoring relevant, statutory safety regulations in the deployment location• Ignoring safety warnings and instructions contained in all documents relevant to the product• Operating the product under incorrect safety or protection conditions• Altering the product or supplied software without authority• The product malfunctions due to operating attached or neighboring devices beyond statutory limit values• In case of unforeseen calamity or force majeureThe use of supplied software produced by SMA Solar Technology AG is subject to the following conditions:• SMA Solar Technology AG rejects any liability for direct or indirect damages arising from the use of software developed by

SMA Solar Technology AG. This also applies to the provision or non-provision of support activities.• Supplied software not developed by SMA Solar Technology AG is subject to the respective licensing and liability agreements

of the manufacturer.

SMA Factory WarrantyThe current guarantee conditions come enclosed with your device. These are also available online at www.SMA.de and can be downloaded or are available on paper from the usual sales channels if required.

TrademarksAll trademarks are recognized even if these are not marked separately. Missing designations do not mean that a product or brand is not a registered trademark.The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by SMA Solar Technology AG is under license.SMA Solar Technology AGSonnenallee 134266 NiestetalGermanyTel. +49 561 9522-0Fax +49 561 9522-100www.SMA.deE-Mail: [email protected]© 2004 to 2011 SMA Solar Technology AG. All rights reserved

Accessories for Central Inverter SUNNY STRING-MONITOR...

Documents

Transcript of Accessories for Central Inverter SUNNY STRING-MONITOR...