The thing to also remember is that if you have 115 VAC available then the converter will give you all the 12 VDC you’ll need for the fridge. This 115 VAC could be from shore 30A or generator.
On the other hand, when boondocking and running off batteries, having the fridge run directly at 12 VDC is more efficient, making batteries last longer.
Refrigerators of that size often run on about 2.5 Amps at 12 Volts, so only require 60 Ah daily. That’s easy to make up from solar or alternator. Or you could run generator for about an hour. The van has two large batteries so powering tiny fridge should be easy.
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