I just bought a 2022 UnityFX and we are pretty new to this. Stayed three nights at a campground with no hookups so made sure batteries were charged up with Generator and only had furnace on, batteries discharged in 3 hours. We have 400w factory solar, (2) Dragonfly DFGC2H 100ah LiFePO4 batteries, factory 2k watt inverter and an Onan 3200 diesel gen. Any suggestions...