Electric Power
Backwoods Solar offers many highly efficient electric and propane powered refrigerator/freezers. They say their best buy for many years has been the Novacool which uses the same high efficiency Danfoss compressor that is used in the more expensive Sunfrost.
Sundanzer makes small (1.8, 2.8 and 8.1 cubic foot) and efficient top-opening refrigerators and freezers. Voltage required is 12 or 24 VDC.
Daily Energy Consumption (No door openings, refrigerator 38oF, freezer +10oF)
| Ambient temperature | 70oF | 90oF | 110oF |
| Model: | |||
| Refrigerator DCR165 | 77 watt-hrs | 168 watt-hrs | 348 watt-hrs |
| Refrigerator DCR225 | 90 watt-hrs | 198 watt-hrs | 393 watt-hrs |
| Freezer DCF165 | 272 watt-hrs | 441 watt-hrs | 766 watt-hrs |
| Freezer DCF225 | 360 watt-hrs | 532 watt-hrs | 817 watt-hrs |
Sunfrost offers a variety of very efficient refrigerator/freezers from 4 to 19 cubic feet. The 19 cubic foot model uses only 15 KWH per month compared to 90 KWH per month for a conventional refrigerator of the same size. Voltage requirements can be selected from 12 VDC, 24 VDC, 110 VAC and 220 VAC.
Propane Power
Crystal Cold makes refrigerators as small as 12 cubic feet that are powered with propane.
