For *just* a refrigerator, continuous load should be easily under 200 watts. When I've measured several of mine they've been maybe 120 watts running. That'd only be about 12 amps off the alternator through an inverter and likely whatever alternator is already on the bus would do fine. Just set up a 500-1000 watt inverter and you're probably good to go. It's when people get into bigger loads like A/C or heating/cooking that a super-duty alternator, generator, etc needs to be brought in.
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