I seriously considered adding a proper chimney or flue for the little Dometic rm 2202 to concentrate airflow to the upper radiator fins. I did add one muffin fan behind the upper vent and then decided to rid myself of the bother and put a 2.7ft\2 dorm fridge in its place. To this rig I added a 1500watt true sine wave inverter and one group 27 battery
. I already had an 80watt PV panel. It has worked out well for me altho I reallly could use about another 100amp hrs. of battery
(another group 27) for extended off grid use. My Dometic was 1.2ft\2. I felt it was inadequate sizewise even if it were functioning adequately. Had I added a small battery-powered fan, an indoor/outdoor thermometer (as recommended by Donna D.) AND ice packs or ice in bottles, I would have further reduced the capacity. Mine did make ice on 120VAC but would warm up after about 12 hrs. I decided not to troubleshoot it AND not to spend money on it because I consider it a toy and a joke. I'm good with the experience of others that the darn things work OR can be retroengineered to work. Had I had a 3 or 4 cubic footer, I also might have considered it worthwhile to do what it takes to help it to optimimum performance or any performance at all. Different strokes, folks.