Yeah, I disconnect camper wire from the truck whether we have 110v or not. So, it only drains the camper battery for camper use. Propane Fridge, propane stove, propane heater (Two tanks - we hardly every use it all). All lights are LED, and we shut down for sleep fairly soon when dark arrives, and we wake up when daylight arrives. We've been truck camping since 2002, so have it down pretty well. Crossed the country five or six times, a few months trip at a time, mostly shoulder seasons, and summer in out of the way campgrounds - not crowded