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The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.
Cruisenews.net posted a link to some very effecient 'conventional' 12/120V refrigeration units. Not cheap, but unlike thermoelectric designs, these will freeze (or maintain a constant 40 degrees depending on thermostat setting).
There are a variety of models.. for the mid-size models, power consumption on 12V is 2.7A for freezing temps at ambient 84 degrees F.
The unit only requires .7A for maintaining 40 degrees at the same ambient temperature.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.