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A cold-plate system is a good candidate for a direct drive off the engine, or large DC battery system. Because it will cycle only once a day for a few hours, you can time it to coincide with a daily engine run to charge the batteries. You can also run it directly off the battery bank.
Another advantage of DC over AC refrigeration is that a well designed system, e.g., with trickle-charge backup, can keep your food fresh unattended for periods <ref>Refrigeration For Pleasureboats by Nigel Calder, International Marine/Seven Seas, Blue Ridge Summit, PA 17294.</ref> <ref>Do It Yourself...Boat Refrigeration by Richard Kollmann, 2430 Sugarloaf Lane, Fort Lauderdale, FL 33312.</ref> <ref>[1] [2] [3</ref> <ref>] [4</ref>]. An AC system would require remote starting an engine.
If you have a propane stove, you might want to consider a propane fridge such as the [http://www.norcold.com/ Norcold].
