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Old 01-04-2020
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badandy badandy is offline
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Join Date: Dec 2016
Location: delavan
Posts: 3,031

Yeah what Greg said - calculating SOC, especially on lead acids, is voodoo anyways. As they age it throws things off, too.

I would start by completely disconnecting all the batteries and letting them sit all day and measure their voltage after they've rested. It doesn't matter what voltage they are, but you want to see what the spread is. If there isn't one battery really low (or high I guess) then I think they are fine, no need to really load test them. You're getting good power in/out of them it seems.
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