Thor Forums

[TyCreek]

If that Deka link I gave is your batteries... I'd call them the same. In parallel they should be ok since they're FLA. Again, "if" that link is a match and they're in good condition ... I'd think the added capacity is worth trying for awhile as it will likely make up for less than ideally matched parallel cells.

A series connection is where cell differences really battle in both the charge and discharge cycles. In parallel, FLA types are usually quite tolerant of some mismatch during the charge cycle. Just check for heat (especially for the first couple cycles) and learn your water consumption over the first few months or so to know how things are getting along.

There is such a thing as too big of wire or getting below internal resistance and that's not ideal. My rule of thumb that has worked well in projects, is size the series connection for max of the pair or a size bigger. Parallel output sized for length plus max total I might pull. Your 4K inverter in this case and it should give wire size recommendations in its specifications.