question

wimmpyiii avatar image

100/30 and 200a 12v lifepo with 4 12v 100w panels series of 4 or 2 of 2

On the calc is shows that if i do 4 series that i need the 100/35. but if it is just a slight efficacy loss at peak sun I dont really care. I live is WA peak sun doesn't happen often. On the other hand will a 2 x 2 with a 15ft run to the controller really have much loss compared to 4 series.

sorry if a similar question as been answered. This is my first solar setup and dont want to brake something or burn down my camper because I didnt ask questions.

solar sizing
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3 Answers
dazey77 avatar image
dazey77 answered ·

your question is missing a lot of detail. If you go 2x2 then your using a different controller?

The 2x2 will be more shade resistant than a 4s, which would be the reason to do it on a camper as a preference (all other items equal)

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JohnC avatar image
JohnC answered ·

Hi @WIMMPYIII

You said 100/35, but I think you mean 150/35, which is much more expensive than a 100/30.

Just go the 100/30 in 2S2P, and with 6mm2 core solar wire (which fits standard MC4 connectors) over that short run, you won't notice any losses in practice.

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wimmpyiii avatar image
wimmpyiii answered ·

Thanks dazey i will do 2S2P with the 100/30.

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