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Old 07-12-2016, 05:18 PM   #1
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Default How to design a PV system

I am just starting to learn about PV. I got MH library on solar and finished that today and I understand 690 and 705 better but I have no idea how a system is designed.

To keep things simple, how would you design a 6kw PV system for a house? Do you build up the voltage or currents with the pv modules or combination of both? Does it totally depend on the inverter because of its minimum input voltage?

Do you use mirco inverters or regular inverter? How are most systems connected, supply or load?

Thanks for any help
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Old 07-12-2016, 06:34 PM   #2
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Originally Posted by kg7879 View Post
I am just starting to learn about PV. I got MH library on solar and finished that today and I understand 690 and 705 better but I have no idea how a system is designed.

To keep things simple, how would you design a 6kw PV system for a house? Do you build up the voltage or currents with the pv modules or combination of both? Does it totally depend on the inverter because of its minimum input voltage?

Do you use mirco inverters or regular inverter? How are most systems connected, supply or load?

Thanks for any help
I don't use micros. So I start with picking an inverter. Then string sizing my choice of panels to that inverter. That is all temperature driven. That gives me the number of panels and how many strings. That then tells me what the combiner will be. Then I would figure out the mounting(I like poles, not roofs). Sometimes you have to change inverters, because of size considerations, # of panels too. Rarely are systems 6000 watts or 4000 watts exactly. I hit the main house panel or if there are breakers under the meter, I hit that.
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Last edited by backstay; 07-12-2016 at 06:37 PM.
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Old 07-12-2016, 08:22 PM   #3
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I don't use micros. So I start with picking an inverter. Then string sizing my choice of panels to that inverter. That is all temperature driven. That gives me the number of panels and how many strings. That then tells me what the combiner will be. Then I would figure out the mounting(I like poles, not roofs). Sometimes you have to change inverters, because of size considerations, # of panels too. Rarely are systems 6000 watts or 4000 watts exactly. I hit the main house panel or if there are breakers under the meter, I hit that.
Thanks Backstay.

So how do you string your choice of panel to the inverter? For example If you have a 250 watt module with max 42.71 VOC accounted for the temp coefficent and a 6kw inverter how would you size the string? Would you do two strings of ten modules or something else?
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Old 07-12-2016, 09:42 PM   #4
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Thanks Backstay.

So how do you string your choice of panel to the inverter? For example If you have a 250 watt module with max 42.71 VOC accounted for the temp coefficent and a 6kw inverter how would you size the string? Would you do two strings of ten modules or something else?
Each inverter manufacture has a string sizing tool. That's what I use.
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