Photovoltaic Installation Terms to Be Familiar With

8/11/2019 Photovoltaic Installation Terms to Be Familiar With

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Figure 1 The 4 curve of a PV module proportionally to irradiance

We consider that theoutput power of the module is the point of the IV curve which shapes the greatest area. As

we can see the irradiance influences mostly the current.

b) Cell temperature: 25C

Figure 2 The output of a PV module proportionally to cell temperature

We consider that the output power of the modulesis the point of the IV curve which shapes the greatest area. As

we notice the output voltage of a PV module depends mostly on its temperature.
http://electrical-engineering-portal.com/calculation-example-of-small-photovoltaic-pv-residential-stand-alone-system


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Is a series electrical connectivity of PV modules. An example of string is the following:

Figure 5 A string consist of 18 PV modules

Assuming that our PV modules output at STC is: Imp 7A, Vmp 30V, 210W If we will measure at points 1 and 2 we

will find: 7A and 540V (18 PV modules X30V) and we get 3,78kW

An example of Array (parallel strings)

Figure 6 Two parallel strings each one consists of 18 PV modules

If we will measure at points 3 and 4 we will find: 14A and 540V (18 PV modules X30V) and we get 7,56kW.

Taking in to consideration the above you can understand the attached Single Line Diagram (SLD) of a 2MW plant.

Download SLD
http://electrical-engineering-portal.com/wp-content/uploads/photovoltaic-single-line-diagram.pdfhttp://electrical-engineering-portal.com/photovoltaic-end-use-application-markets


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Erin Ndrio - Electrical & Electronic Engineer. Specialized for design, sizing and energy analysis

of a Photovoltaic installation (more than 50 PV projects of Nominal Power > 30MW). Sizing of

MV/LV components of a substation. Experienced in MV and LV operations. Expert in AutoCAD.

Photovoltaic Installation Terms to Be Familiar With

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