Design of a Out Grid System
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Transcript of Design of a Out Grid System
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FACULTY OF ELECTRICAL ENGINEERING
Electrical Power Engineering of Industrial and Distribution Networks
Design of off-grid power system
Author: Pau Miralles Ferrs
Teacher: Lukas Prokop
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TABLE OF CONTENTS
1. INTRODUCTION __________________________________________________________________ 4
2. OFF-GRID POWER SCHEME _______________________________________________________ 6
3. INSTALLATION ___________________________________________________________________ 9
4. POWER CONSUMPTION ANALISYS _______________________________________________ 12
5. DESCRIPTION OF INDIVIDUAL COMPONENTS ____________________________________ 16
6. DESIGN OF INDIVIDUAL PARTS OF THE SYSTEM __________________________________ 20
7. PLANIFICATION AND COST EVALUATION ________________________________________ 26
8. CONTROL SYSTEM ______________________________________________________________ 28
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Introduction
1. Introduction We live in a society where all the things that we need are provided by
others; water, electricity, food
Off-grid living consists in that, reduce the necessity and dependence from
third persons regarding to our lives.
In this Project, I will try to design a smart off-grid power system in a family
house, using solar panels and batteries. The main idea of this is to have a
self-sufficient house, and the goal is to have reliability, carbon emission
reduction and cost reduction at long-term.
The cost of this kind of installations has dropped about 30% in the last 6
years, so in the present is a very nice option to consider
The best option is to calculate the complete system and find the best
technic and economic solution for this.
The main parts of this installation are:
Solar panels: This dispositives are used for using the solar power to
convert it in electricity using the fotovoltaic energy. If you need more
panels in the future, you can enlarge it easily, with easy installation.
Charge controller: It have two basic functions:
-Avoid overloading and deep discharge of the batteries, as this can cause irreversible damage to them.
-Prevent battery discharge through the panels in less light periods.
For enlarging the system, is better to use a charge controller that allows more panels, then you can enlarge it easily.
Inverter: Its function is to convert from DC that the fotovoltaic installation
gives, to AC, which is needed for almost all the electronic components in
the home. Is better to have it a little bit bigger inverter than the calculated,
but you can add more inverters in the future.
Design of Off-Grid Power SystemTtulo del Proyecto 3
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Introduction
Batteries: The main function of the batteries in this systems is to
accumulate the energy produced during the light hours, for being used at
the night or during long periods of bad weather. Another important function
of the batteries is to provide a higher intensity that the fotovoltaic panel
can give.
Other components: We need an aluminium structure big enough for our
solar panels, and the cables, that will be purchased according to our
needings.
Design of Off-Grid Power SystemTtulo del Proyecto 4
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Off-Grid Power Scheme
2. Off-Grid Power Scheme For the installation, we have three options:
-Only direct current (DC)
-Only alternating current (AC)
-Direct and alternatinc current: We will use this option, the main advantage
of this, is that the installation is simpler, and we can use less section
cables. This type of installation needs a senoidal converter.
Our scheme will be like this:
We will have the photovoltaic panels on the roof. The main danger of
working with CC is that we have to bear in mind the polarity of the panels.
The first step is to identify the positive and negative terminals. For making
the connection between the panels and the charge controller we will use
always terminal, and the cabling has to have an insulation for 1000V,
because is outdoor and maybe there is humidity.
Design of Off-Grid Power SystemTtulo del Proyecto 5
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Off-Grid Power Scheme
For battery installation, we need a room with conditions which ensure the
proper operation of the battery bank:
- Protected from meteorological inclemency, and with a nice
temperature for their work (if we have low temperature, the battery
capacity decreases, and if we have high temperature, it decrease the
batterys life).
- It have to be properly isolated for prevent abrupt changes of the
temperature.
- It have to be a dry and ventilated, in order to prevent accumulation
of gases that are produced with the battery charging. Is better to
have openings in the top of this room, for prevent risks of fire or
burst (Hydrogen is lighter than the air and it tends to accumulate at
the top).
- It have to have an easy accessment, for having an easier
maintenance.
The battery has to be as nearest as possible to the panels and to the
charge controller, in order to reduce losses by voltage drop, and less
length of the cabling.
Is not good idea to place the batteries directly on the floor, is better to
have a small height to electrically isolate the ground, like this:
Design of Off-Grid Power SystemTtulo del Proyecto 6
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Off-Grid Power Scheme
Controller: We have to keep in mind the polarity, we will connect the cables
using terminals. Its reccomended to connect the battery at first, after the
solar panels, and at finish the consumption.
We will install an automatic switch at the battery output in order to prevent
from dead shorts.
Converter: It has to be as nearest as possible from the batteries, in order
to prevent voltage drop. This is the way to connect the converter:
Design of Off-Grid Power SystemTtulo del Proyecto 7
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Installation
3. Installation For the installation of the solar panels, we have three possibilities:
- Floor: Is the most used in groups of panels. The advantages are that
the structure dont have wind influence, and its easy to assembly.
- Wall: Its tipycal in home installations. The disadvantage is that you
can only install it in the south wall. It have not problems with the
wind too.
- Roof: Is the most used, and we will use this installation. You can
have a nice place for assure a perfect otrientation of the panels. The
drawback can be, as the floor, they can be covered by the snow.
Orientation: We live in the northern hemisphere, so we have to put the
panels oriented to the south.
Inclination: Solar radiation incident on the panel can differ depending on
the angle it forms with the horizontal. Depending on the inclination, the
solar energy can change, and will be maximum when the position of the
plate is perpendicular to the radiation.
The optimal tilt over a year can change, therefore, for fixed panel
installation, is usually choosen the best inclination for the winter, which is,
improve uptake in winter against a catchment loss in summer.
In the next table, we can see the relationship between latitude and the
angle with more power for winter and summer.
Design of Off-Grid Power SystemTtulo del Proyecto 8
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Installation
Latitude in the installation place (in
degrees)
Tilt Angle (Winter) Tilt Angle (Summer)
0 15 15 15
15 25 Same as latitude Same as latitude
25 30 Latitude +5 Latitude +5
30 35 Latitude +10 Latitude -10
35 40 Latitude +15 Latitude -15
>40 Latitude +20 Latitude -20
This is the map and the place where I will install the off grid system.
Design of Off-Grid Power SystemTtulo del Proyecto 9
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Installation
I have chosen this place in the mountains, because is where my
grandparents have a house, and it can be a good opportunity to improve
the electric installation, because the only possibility to have electricity
there is a gas power unit.
The latitude in this point is 0.06, so we will have the solar panels at
15 from the horizontal line, oriented to the south.
Design of Off-Grid Power SystemTtulo del Proyecto 10
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Power consumption analysis
4. Power consumption analysis
We will use as most as posible, energy efficient appliances, in order to
reduce the power consumption, and consequently, the cost of the off-grid
installation. This is our house:
Design of Off-Grid Power SystemTtulo del Proyecto 11
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Power consumption analysis
Electronic devices in every room:
- DC devices:
Equipment Power (W) Number of devices Working hours/day
Total Energy (Wh)
Lighting in room 1 (Dormitory) 5 3 3 45
Lighting in room 2 (Bathroom) 5 2 2 20
Lighting in room 3 (Dormitory) 5 2 2 20
Lighting in room 4 (Washroom) 5 1 0.5 2.5
Lighting in room 5 (Toilet) 5 1 0.5 2.5
Lighting in room 6 (Hall) 5 6 4 120
Lighting in room 7 (Kitchen) 5 4 4 80
Total Power 95 W 290 Wh
- AC devices:
Equipment Power (W)
Number of devices
Working hours/day
Total Energy (Wh)
Washing machine (137 kWh/year)
365 1 1 365
TV 43 1 4 172
Fridge (149 kWh/year) 17 1 24 408
Laptop 70 1 6 420
Mini Oven 1500 1 0.5 750
Hair dryer 1200 1 0.2 240
Electric table grill 1800 1 0.3 540
Total Power 4995 W 2895 Wh
Total Power (DC + AC) = 5090W
Total Energy (DC+AC) = 3185 Wh
Design of Off-Grid Power SystemTtulo del Proyecto 12
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Power consumption analysis
Description of appliances.
We will use the most efficient appliances in the market. They are a little
bit more expensive, but the cost will be reduced because we will need less
solar panels and batteries.
In the lighting part, we will use for all the house 5W Led Bulbs, they will
be distributed across the ceiling of the all the rooms in the house.
5W MR16 DC12-18V Cool White Spot Bulb
Link: https://www.myled.com/p1760-5w-mr16-dc12-18v-
cool-white-spot-bulb.html
For the appliance, we will always see the energy labelling, that is the same
for all the European Union:
The energy labels are separated into at least four categories:
The appliance's details: according to each appliance, specific details, of the model and its materials
Energy class: a colour code associated to a letter (from A to G) that gives an idea of the appliance's electrical consumption
Consumption, efficiency, capacity, etc.: this section gives information according to appliance type
Noise: the noise emitted by the appliance is described in decibels.
We will try to choose all from A to A+++, to get the maximum efficiency.
Design of Off-Grid Power SystemTtulo del Proyecto 13
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Power consumption analysis
Washing machine: Siemens WM14Y740EE
Energy efficiency class: A+++
-30% more economical (137 kWh/year) than the standard value (196 kWh/year) of energy efficiency class A+++.
Link: http://www.siemens-home.es/electrodomesticos/lavadoras/libre-instalacion/WM14Y740EE.html
Television: Samsung UE40H6400AW
Energy efficiency class: A+
Power consumption: 30W
Power consumption in standby: 0,3W
Link: http://www.samsung.com/us/video/tvs/UN40H6400AFXZA
Fridge: Bosch KGE36BW41G
Energy efficiency class: A+++
Power consumption: 149 kWh/year
Link: http://www.bosch-home.co.uk/our-products/fridges-and-freezers/fridge-freezers/KGE36BW41G.html?source=browse
Mini Oven: 23 litre mini oven & grill with double hob
Power consumption: 1500W
Link:https://andrewjamesworldwide.com/UserControls/productIndividual.aspx?ProductID=36
Hair Dryer: X5 Superlite
Power consumption: 1200W
Link: http://www.amazon.com/X5-Superlite-1200W-Ceramic-Ionic-Travel/dp/B001FSK73G/ref=sr_1_12?s=hpc&ie=UTF8&qid=1418528668&sr=1-12&keywords=hair+dryer+1200
Electric Table Grill: Electric Teppanyaki Barbecue Table Grill
Power consumption: 1800W
Link: http://www.amazon.co.uk/Andrew-James-Electric-Teppanyaki-Barbecue/dp/B003USP2WA/ref=sr_1_3?ie=UTF8&qid=1418529005&sr=8-3&keywords=electric+grill
Design of Off-Grid Power SystemTtulo del Proyecto 14
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Description of individual components
5. Description of individual components Solar panels: We will use Nousol solar panels, with excellent efficiency,
based on the use of innovative photovoltaic technologies.
Physical Characteristics:
Solar cells laminated with TPT/EVA bi-layer for long life. High efficiency monocrystalline cell High efficiency with high transparency low iron tempered glass cover. Anodized aluminium frame. Sealed for protection from hars enviroments. Junction box with by-pass diodes. Outstanding low light perfomance. IP65.
Mechanical data:
Electrical data:
Design of Off-Grid Power SystemTtulo del Proyecto 15
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Description of individual components
Charge controller: We will use a Steca Solarix PRS 3030 (30A). In this,
several LEDs in various colours emulate a tank display, which gives
information on the batterys state of charge. The Solarix PRS charge
controllers are equipped with an electronic fuse, thus making optimal
protection possible. They operate on the serial principle, and separate the
solar module from the battery in order to protect it against overcharging.
Main features:
- Automatic detection of voltage
- Voltage and current regulation
- PWM control
- Current compensated load
disconnection
- Automatic load reconnection
- Temperature compensation
- Integrated self test
- Monthly maintenance charge
Electronic protection functions:
- Overcharge protection
- Deep discharge protection
- Reverse polarity protection of
load, module and battery
- Automatic electronic fuse
- Short circuit protection of load
and module
- Overvoltage protection at
module input
- Open circuit protection without
battery
- Reverse current protection at
night
- Overtemperature and overload protection
Design of Off-Grid Power SystemTtulo del Proyecto 16
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Description of individual components
Inverter: Our inverter will be a Cotek with 1500 W True Sine Wave. It
can feed sensitive electronic equipment.
Main features:
- True sine wave output (THD
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Description of individual components
Detailed features in the inverter (we will use the second in the table):
Design of Off-Grid Power SystemTtulo del Proyecto 18
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Design of individual parts of the system
6. Design of individual parts of the system
The power installed on the house is 5090W, and we consider that we
have a constant power consumption of 3185 Wh every day of the year.
With the data that we have (estimated yeld of the appliance) we will
calculate the solar daily requirement that the solar field have to supply.
At first, we have to know the solar irradiation in where we will place the
installation.
Here are the maps of the Solar Irradiation in Europe and Spain:
Design of Off-Grid Power SystemTtulo del Proyecto 19
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Design of individual parts of the system
And for being more exact, this is the table for my coordinates with the
average daily sum of global irradiation per square meter received by the
modules (kWh/m2):
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Av. year
2.96 3.96 5.32 5.77 6.54 7.2 7.24 6.45 5.29 4.35 3.27 2.71 5.09
Design of Off-Grid Power SystemTtulo del Proyecto 20
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Design of individual parts of the system
Panels:
For calculating our needings, we will use this formula:
Ar = 1200 X Ed / Id
Where:
Ar: Panel size (Wp)
Ed: Electricity usage (kWh/day)
Id: Irradiation (kWh/m2/day)
Then, we need:
= 1200 3.1855.09 = 750.884 = 750.884195 = 3.85 In our installation, we have to use at less 4 solar panels, which we will
connect in parallel, then we will have 780 Wp Power.
Charge controller:
For sizing the charge controller, we have to forecast the intensity peaks,
then we use a correction coefficient (25%)
Icont=1,25IscNparallel mod
Icont = 1,255,724 = 28,6A
We will use a 30A charge controller.
Design of Off-Grid Power SystemTtulo del Proyecto 21
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Design of individual parts of the system
Batteries:
To size the batteries, we need this parameter:
Dodmax: Maximum depth of discharge, in lead acid batteries, it is between
0.6 and 0.8, so I will use 0,7.
Autonomy days: I will choose 5 autonomy days, for being sure that if we
have some cloudy or bad weather days, we wont be without electricity.
Eelec: We calculated it before, is the energy expended in one normal use
day in the house.
The accumulated energy in the batteries with the correction factor is:
= 1,1 ( ) ()
= 1,1 5 31850,7 = 25025
And the needed capacity will be:
= ()
= 2502524 = 1042,7
Then, if we are using 345 Ah batteries, we need 4 batteries for having
this capacity. We will have 4345=1380 Ah
Design of Off-Grid Power SystemTtulo del Proyecto 22
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Design of individual parts of the system
Inverter:
The size of the inverter have to be the maximum power of the appliance
that can work at the same time. For this, we have to use the peak power,
which can be 4 times bigger than the nominal one. Then we will do it
20% bigger for security.
= 1.25 (4 ( + ) + + ) = 1.25 (4 (365 + 17) + 70 + 43 = 2051,2
Then, we will use an inverter with 3000 W peak power. For sure we
have to take care of dont have the hair dryer, oven Connected at the
same time, if we do that, the circuit breaker will stop the electricity.
----------------------------------------------------------------------------------
Knowing all of this information, we can do the complete energy analysis
during the year using PVGIS
Location: 4016'15" North, 03'29" East, Elevation: 353 m a.s.l.,
Solar radiation database used: PVGIS-CMSAF
Nominal power of the PV system: 0.8 kW (crystalline silicon)
Estimated losses due to temperature and low irradiance: 9.2% (using
local ambient temperature)
Estimated loss due to angular reflectance effects: 2.9%
Other losses (cables, inverter etc.): 14.0%
Combined PV system losses: 24.2%
Design of Off-Grid Power SystemTtulo del Proyecto 23
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Design of individual parts of the system
Ed: Average daily electricity production from the given system (kWh)
Em: Average monthly electricity production from the given system (kWh)
Hd: Average daily sum of global irradiation per square meter received by
the modules of the given system (kWh/m2)
Hm: Average sum of global irradiation per square meter received by the
modules of the given system (kWh/m2)
Design of Off-Grid Power SystemTtulo del Proyecto 24
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Design of individual parts of the system
Design of Off-Grid Power SystemTtulo del Proyecto 25
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Planification and Cost Evaluation
7. Planification and Cost Evaluation At finish, we have to know how much will cost all the off-grid
installation.
We will choose a kit with all the components together, because it will
be less expensive than purchasing one by one.
This kit is sold without the inverter, and the price is 2758.62.
Included in the kit:
4 panels 195W/24V (ref: 11000017) 1 solar carge controller Steca 30A/12V LEDs (ref: 13008005) 4 batteries monoblock 6V/345Ah C100 open acid lead of deep download (ref: 14009618). 4 sets of positive and negative terminals for battery. 4 sets of connetors male and female for the panel connection.
http://www.nousol.com/index.php?page=shop.product_details&flypage=tpflypage.tpl&product_id=856&category_id=56&option=com_virtuemart&Itemid=53&lang=en&vmcchk=1&Itemid=53
Design of Off-Grid Power SystemTtulo del Proyecto 26
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The prize for the inverter will be 920.72
http://www.nousol.com/index.php?page=shop.product_details&flypage=t
pflypage.tpl&product_id=552&category_id=59&option=com_virtuemart&
Itemid=53
Total prize for the solar kit:
2758.62+920.72= 3679.34
The cables will be purchased depending of the needings for the home, but
they are not very expensive.
Design of Off-Grid Power SystemTtulo del Proyecto 27
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8. Control system My control system will be a door locker/unlocker system.
It lets you lock and unlock your door through a smartphone app,
either on demand or automatically, and it lets you send passes to other
people who have the app.
Advantages:
Keyless: The encrypted technology of this locker is safer than keys
that can get lost and codes that can be copied.
You can control when people have acces to the home. For example
you can issue a key that works 24/7 for a family member, or one that
works a couple of hours a week only for the cleaning person.
Log record: There is a log record in the smartphone where you can
see who entered and exited.
Design of Off-Grid Power SystemTtulo del Proyecto 28
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It works with 4 AA batteries, then, doesnt matter if there are no
electricity, maybe because a problem, you will can open the door. When
the batteries get low, the device send reminders to the smartphone.
Features:
Auto-Unlock: with Bluetooth connection, when you approach to the
door, it automatically unlocks the door without touching anything.
EverLock: When you go out, if you are far from the door, it will be
locked automatically, then you dont have to worry if you left your door
unlocked.
Easy install: The device replaces the interior portion of the existing
deadbolt and does not require to change the exterior door hardware, it will
be installed in more or less 10 minutes.
The prize of this device is 250$, and you can buy it in Amazon:
http://www.amazon.com/dp/B00OHY14CS/ref=asc_df_B00OHY14C
S3454105?smid=ATVPDKIKX0DER&tag=mysimon-wireless09-
20&linkCode=df0&creative=395093&creativeASIN=B00OHY14CS
Design of Off-Grid Power SystemTtulo del Proyecto 29
Design of off-grid power system1. Introduction2. Off-Grid Power Scheme3. Installation4. Power consumption analysis5. Description of individual components6. Design of individual parts of the system7. Planification and Cost Evaluation8. Control system