Mex is right again!
You can way over-do fussing with the batteries, when it is so cheap to just replace them every few years.
The advantage of fussing with batteries and not having to replace them yet, is to be able to run a big inverter off a battery bank (that is still in good shape) to run the high amp drawing 120v appliances without too much voltage drop that would trigger the inverter alarm at 11v, and keep doing that down to 50% SOC on the inverter's batteries.
Anybody can go Rving for a long weekend on a pair of 27s as long as he doesn't have a big inverter. This is all about pushing the envelope using what you have, if you do rely on a big inverter to run the MW etc..
EG, I have learned on here that a pair of AGMs can do as well as four 6s for running the big inverter. I have tried it and it works out. So I am fussy about my AGMs since they are only 100AH each and cost a bundle.
I have the new to us Class C rigged up with the big inverter on just the two AGMs, while the rest of the rig 12v runs on a different bank of four older Wet batts. Each batt bank has its own converter and can be fast-charged from a portable gen, and each will have its own solar array--similar to how I did the 5er in 2013 in one of my set-ups back then.
I am not nearly so fussy about those four Wet batts, because I can make up for any abuse by Equalizing, adding water, kicking them, whatever--but I can't do all that with the AGMs. Gotta treat them right! So that is the point of the OP- to make sure I get them truly full on a recharge at home, and no errors.
