I have had one for a few years also. its a dometic portable chest freezer/refrigerator, which uses a danfoss compressor.... it runs on 1.3amps@12volts (or, 120vac) when the compressor is working, and the compressor duty cycle is determined by how cold i have it set to and the outside temps..... to keep foods well frozen in 80 degree temps, it runs about 80% of the time, but insulating it keeps the run time even lower for better energy savings....
I use a moving blanket placed over it for insulation, which helps a LOT.... but dont cover the cooling vent holes for the compressor.