Make sure the Trombetta, isolation relay between cranking and house batteries, is wired to draw power from the house batteries not the cranking battery. Ours was wired wrong from the factory and caused the house batteries to discharge faster. For use the problem was solved by moving the Trombetta plus power lead from the cranking side to the house battery side.
2016 Axis 24.1 E-450 6 spd tranny
300 watts portable solar.
200 watts solar on the roof.
Wrangler JK dinghy