A totaly unsceintific test on power use for this fridge.
I took it for it's field feild test yesterday. I have not had the chance to run wiring and a socket to plug it into in the back of the truck yet but wanted to use it for lunch and sodas for the day. I was kicking around the garage and got a bright idea. Why not plug it into the portable power unit / jump start box, it's got a 12v outlet on it.
A 4 AM departure was planed so I loaded it up with lunch, sodas and a couple of beers. Maybe a quarter full, this thing is gonna hold more than I thought. I pluged it in to 110V, set it for 36 degrees and wrote myself a note to unplug it in the morning. I didn't want to drive off and rip the cord out of the garage.
At 4AM I pluged it in to the power source and pushed the test button. It read 13.1V. The outside temps ranged from 37* on the drive over the mountain in the morning, to 72* mid afternoon. We were into it a half dozen times during the day. At 5PM when I unloaded it from the truck, it ws runnig just fine at the preset temp. I pushed the test button again on the power source and it read 12.6V
So, my unsceintific observation is that I could get 24 hours out of the little power source battery before it fell below 12V .
My $.02 is just what it's worth