My two cents - if you can think it, it can probably be done. Doesn't mean it would be easy. If I was trying to engineer a solution, I'd probably end up buying a 12V power inverter (think the kind you plug into a vehicle's accessory (cigarette lighter) socket.) I would power that with a connection to the camper's battery, yeah, inline fuse to protect etc. I would locate the inverter near the area the refrigerator plugs in to the AC plug. When off grid, or when towing, you could manually unplug the refrigerator from the outlet it gets 120V (shore power) and plug it into the inverter (it will get the 12V from the batter and output as 120V?) Not sure how efficient that would be, what the drain on the battery would be or how long it would last.
And-in a lengthy reply-why would you want to do this? The refrigerator can be used in propane mode off-grid and while traveling (yes-some owners are against propane use while driving-that's another discussion.)
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2012 FunFinder X 210UDS
4-68 watt flexible panels; 1-215 glass panel/4 Battle Born LiFePO4 Deep Cycle Batteries
2014 Ford F350 6.7 Liter PowerStroke V-8 Diesel longbed, SRW
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