I really appreciate the info! Very helpful for sure.
I'll have to consider the golf cart batteries (though I don't have a Costco membership), but since I run a 24v system, I'd need 4 of the 6v batteries ($400). Granted, that would give me 840Ah vs. 4 of my current batteries at 420Ah which is...
Well, currently everything is outside, under the cover of the nose of my 5th wheel RV (batteries, charge controller, inverter, combiner box). So, perhaps the temp showing on the controller may be similar to the temp of my batteries?