Last march i converted a 5 cubic foot Chest freezer to refrigerator that i bought used locally, i used a 10.00$ mechanical thermostat that i got off ebay and mounted it in the base by the compressor and wired in a light to tell me when the compressor was running( its so quiet that its hard to tell when its running) and i have been very happy so far. i sold the traditional up right fridge/freezer and bought another 5 cubic foot chest freezer to replace the regular freezer.
Doing this saves me around 1 KWH per day ( went from 1.25 KWH down to .20-.25 ), i`m single and live alone so i don't keep much in a fridge most of the time and keep most things frozen when ever possible.
There are some things that are rarely brought up about the conversion in most posts i have read.
1- Condensation is a problem, chest freezers don't have a condensate drain(older ones sometimes didn't even have a defrosting drain)
It builds up fast in humid environments and the more the door is opened and closed. the freezer sits so close to the floor most of the time that there is no place to ad a small drain hose and
drip pan.
2- mildew occurs more quickly than with a regular fridge due to the extra humidity inside the unit. Ive read were some have used reusable descant driers that they get from amazon to help combat the problem.
3- it will need to be cleaned more often to combat #1 and #2
I have no complaints so far, about every three weeks i take everything out ( i have build a rack from plastic milk crates and it just lifts out) wipe out the inside with a dish towel and clean it with a little Clorox and water and put everything back in . takes 15 min or less.
I converted another one for my step fathers cabin and it ran 24/7 in the summer with one 350 watt
solar panel, 15 amp charge controller,3 12volt deep cycle battery's and a 1500 watt modified sine wave inverter. the cabin is not used in the winter and i doubt we would get enough sun to keep it going anyway with just one panel. but more could be added if the need arose
if i do another conversion, im going to try a 7 cubic foot for the fridge just for the extra space (ʘ‿ʘ)