The question is what was it made for?
Second question is what do you want to save.
A house fridge is built for max internal volume , so thin insulation and a heater required to dry the insulation.
Huge power hog , hardly a problem at the power pole.Or motoring with a small cheap inverter
The RV and other vehicle fridges will be more robust and usually be better suited to a boat.Door locks and shelves that try not to spill .
The "off grid" stuff like a Sun frost has wonderful insulation and a good AC or DC internals. But none of the RV/boat features like door locks.
If you want to go on the hook, the price will be either a few hundred pounds of batts per day , lots of noisemaker and reduced batt life or a different energy saving method.
A big eutetic plate (brine tank) works in a well insulated box , for a quiet night or even two.
For me , propane , with 30 days of silence works the best .
IN RV stuff the ones that vent to the cabin seem to be easiest to build in, and not overheat.