I'm not very technical, but I know it's a bad idea to mix old/new batteries or different outputs. Personnally, I have 2 x 110ah batteries fed by the usual charging as well as 2 x 100w solar panels with a 2000w inverter. This works very well for me when we're not hooked up over 3 or 4 days, and, in my opinion, is well worth the money.
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