I live on a 1980 ,36 hunter
and do lots of cruising. 7 years ago I installed a Norcold 201 three plate freezer unit in a 7 1/2 cubic ft. icebox
and converted it to a freezer/refigerator unit.80% freezer ,20% fridge.Spent 7 months in Bahamas
and never had a problem.Kept icecream for about 4 months until it was gone.Have never shut it off,defrost it with my sprayer from the galley
sink using hot water
.Insulated it with 2 in. high density foam.
With what already was there, it has worked out very well and I am impressed by it.No more to say,mine works good and I won`t change it.