Ok... back on topic-
It appears that swapping to a couple 24v batteries in parallel with a 24v-12v step-down converter between the batteries & the RV's converter is possible, but not the most efficient system. From what I've read from pianotuna's solar articles... running 4-6 deep-cycle 6v batteries in parallel/series seems to be the way to go. It would probably be a lot easier to set up, & give me way more amp hours in the long run? I wish Lithium batteries weren't so stinking expensive. 3- of these: https://battlebornbatteries.com/shop/12v-lifepo4-deep-cycle-battery/ in parallel would probably be all I'd ever need... only $3000!
