Even running the frig and hot water heater on propane, the controls for all your appliances including the frig are still drawing 12v. Propane detectors etc. will also be drawing current in addition to things you are actually running like fans, lights Tv's etc.
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
2017 3500 Dodge Maxi DRW 4X4, Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, etc.