Isotherm fridge in camper?

There are several manufacturers of small 12 volt compressor refrigerator/freezers. I have a NovaKool unit. One issue is electric consumption. My unit is small, about 4 cuft. When running it pulls about 3 amps. In 70 degree temps it will run about 1/3 of the time pulling a modest 25 AH/day. When ambient temps are a few degrees warmer or you open the refrigerator numerous times, or you add some room temp items, then power consumption can easily double to about 50 AH/day. Since most of my RV travel is in the warmer months, that is probably about my average power consumption. So for 50% battery depletion, the refrigerator will use the equivalent of about one RV battery per day. I do have a couple of decent AGM batteries and a solar system, but I still need to run a generator if I am camped in the shade for more than a couple of days or it is cloudy for that period of time.

Also consider a 4 cuft unit is quite small. There is a trend towards larger refrigerator/freezers. A larger unit with the larger Danfoss compressor can easily pull over 100 AH/day.