I use shore power exclusively, but since I'm in the boonies, I sometimes loose power for a few hours. I have a fifth wheel with one of those car batteries in an outside compartment that you can hook up. I am told that my converter will keep that charged, but other sources say that will burn up your battery. I just thought I'd leave the battery hooked up for the RARE occasions I loose electrical power, so at least I'll still have lights and stuff. Also, I replace the refrigerator with a regular electric one because the LP/Electric Domestic one original to the trailer died and it was too expensive to replace it. Will the fridge run on battery power? It is only a 9 cu. in. fridge. I don't know the wattage/amps.