Yes I know what you mean, I just finished pretty much the same project as you 300 watts solar, MPPT controller, 2500 watt inverter, electrical sub panel, auto transfer switch, Trimetric monitor. Batteries are new but not what I would have bought, the dealer put these marine deep cell off brand ones in, I will wear these out then get better quality deep cells. I am in a Gulf Stream motor home now but I also did the same project on my 2013 Wildwood TBSS previously.
Dale & Terri, Lulu & Tiki (our Chihuahua's), New rescue puppy Prince - Pom/Pug mix.
2013 Tundra, Double Cab, 5.7, TRD Off-Road, 4X4, Full Tow Package
2013 Wildwood T26TBSS - Sold
2000 Gulf Stream Sun Voyager M-8357 MH, Ford Trident V10 Gasser, 35 foot.