Quote:
Originally Posted by cstreit
12V chargers don't do well with multiple batteries.
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The only time there is a problem is when they are "out of sync" with each other. Or if they have different capacities. Or the cables connecting them have different resistance. Or if they are different ages.
I design large battery banks using 200AH, 12V batteries, up to 48VDC and up to 96kWh (40 batteries). You need a good equalizing system and to have it run weekly. Anything much bigger, these days, and you are better off with the extremely large single cell units (1000-2600 AH, 2V cells), strung in series.
A couple of 12V-200AH batteries, if they are the same age, charge and the charging connection is equal, shouldn't be a problem.