question

ant13 avatar image

Is it possible to charge two different 12V batteries wired in parallel?

I have a simple Solar setup, using MPPT 75 I 15, a Siemens Solar Panel M110-24 and a 12V110Ah battery.

I want to add more battery capacity, and I'll buy a new battery, like 12V200Ah, but it'll be different from age and capacity, I was wondering if it's advised to connect them in parallel (same length cable size)?

if not, what's your advise? thanks in advance,best regards.

battery connection
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2 Answers
maremotomoto avatar image
maremotomoto answered ·

Yea, but you willuse the 110 more then the 200 wire it asynchron... (-) from the mppt to the 200 and the (+) to the 110

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hi, thanks for reply, as I understood, the 110Ah battery will discharge first than 200Ah battery? even when they are in parallel? in that case, adding a parallel battery will not increase the bank capacity? I'm confused. Will the use of Argo FET 100-2 do the job? thanks.

ant13 avatar image
ant13 answered ·

hi, thanks for reply, as I understood, the 110Ah battery will discharge first than 200Ah battery? even when they are in parallel? in that case, adding a parallel battery will not increase the bank capacity? will the use of Argo FET 100-2 do the job?

I re-draw the wiring you advised; should be like this?



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