I don't know about the others, but not
My Norcold 704DE has a 21 volt AC Swing compressor that runs either from a 12 volt inverter built in or a 21 volt winding off the built in 120 vac transformer shared with the inverter.
The inverter has to generate a 60 hz. Square wave for the compressor to work correctly.
It will also run from the 120 vac when operated off an inverter.
The beauty of the swing compressor is no starting surge unlike a rotary compressor.
Engle fridges are also made this way.
The fridges with Danfoss compressors are quieter since the piston I'd not rattling back and forth.
Both seem to draw about 40 watts running.
My Norcold 704DE averages about 20 watts taking into account cycle time.
If you go with a dorm type of refrigerator
you will need a little larger inverter to account for that starting surge.
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