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I also have 2 group 24 batteries, 6 months old.they keep the heat on all night but get down to 12.4v. The generator brings them up pretty quickly in the morning and a 100w solar panel keeps them topped off on most days. So here is the question, if I want to add a couple more batteries, can I add 2 6 volts or a couple group 27’s to the 2 24’s? I believe I read that they should all be the same type. If that’s the case I might just add a couple more 24’s and upgrade all 4 in a few years. Suggestions?
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