Some go for the propane/electric units and some go for the energy hog style home refrigerators. I went with the KISS method here and chose a unit that is very efficient and also will store energy to last 12 or so hours with no DC power. I have run this unit for 4-5 days and never needed to recharge the house battery set. I ran these refrigerators on the boats and they are very reliable and keep the expenses and irritation factor to a minimum.