I'm new here and certainly late to this discussion, but if the OP is still working on her 12V/solar electrical needs, I think it worth mentioning that there is still a 30% fed tax credit for solar installations, and our motorhomes qualify. Plus if she were to upgrade to LiFePo4 batteries with her upgraded panels, that cost can also be claimed for the tax credit. We just bought a used 2019 Isata 3 and the AGM batteries had been deep cycled to death, so I installed two 100Ah BattleBorn LiFePo4 batteries and couldn't be happier with their performance. If I were to add another 100W panel (currently 200W), and I may, I could also realize the credit on the entire upgrade, batteries included. Sure, their cost is up there, but for what they give in return, it deserves consideration IMHO. We boondock a lot, our batteries are incredible and they provide so much more usable power than FLA. Not trying to start a debate on FLA vs LiFePo4, cost or otherwise, just trying to offer options to the OP.