The voc of my 3 x 245w panels is 159v, would I be right in thinking i can connect my panels in parallel and use a 150/70 charge controller? I'm running a 12v system.
Thanks in advance.
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Solar charger sizing query.
Please clarify, Is it 159Voc per panel or all three in series?
159v voc would be all three connected in series.
Negative; the 150v input rating is a HARD LIMIT and must not be exceeded under any circumstances. You could, however, wire two in series and keep the third in parallel and -depending on the other specs of your panels- be fine.
I realise the voltage shouldn't be exceeded, I was under the impression that if I connected all three panels in parallel that I'd be well under the limit and able to use a smaller less expensive controller, the 150/70.
Panasnic hit's?
3 parallel on a 100/50 will be ok for a 12v battery system. You will need string fuses though.
Justin, Can you explain a little more about 2S 1P config. I did not realise that was possible, it may open up module upgrade for my current MPPT. Are there any drawbacks?
I would also like to know, from what I heard if you have 3 panels, you should never connect 2P 1S or 2S 1P and that S and P strings should always be equal numbers like 4 panels 2P 2S or 6 panels 3P 2S etc.
Hi Frosty. Agree that paralleled into 12V batts would be fine.
Just adding that you wouldn't need a 150/ mppt in that case, and I'd actually suggest you consider a 100/50, which would rarely (if ever) clip at the A-limit into typical charge voltages. Might save you some coin..
I wondered if that would be the case, appreciate the reply, cheers.
