If you are concerned with how long it will cool on battery power then you need to shop for the lowest energy usage. All refrigerators have, because of fedral law, a sticker giving the kilowatt hours consumed per year. Lower is better! If you want a fairly large refrigerator, check out the Avanti 1201w-1, 11cu ft, it is rated to consume 277KWh/year which equates to an aveage of 31.62 watts. A litle (8.7 cu ft)., but without much freezer space is the Avanti RM901W which at 230 kwh/year or about 26.25 watts average, is getting right down with Sunfrost. I chose to go even smaller but with a much larger freezer behind a second door I chose the Avanti 651 wt1 (I actually got the ss653 which is the stainless version). This is only a 6.3 cu ft unit but it's plenty for my use and its rated draw is 254 kwh/yr or about 29 watts average. After I got mine I ran it overnight through a "Kil-a-watt" power measuring toy. I recorded an average use of 26 watts over 24 hours. Then I added insulation, 1" to the back, sides and bottom and 1 1/2" to the top. I had to relocate the compressor and remount the coils on the back. I used 1/2" sheets of 'Rmax" (r7/ inch) material and glued it on and taped all the seams. After adding the insulation I did another 24 hour run and recorded an average of 19 watts. So adding insulation is very much worth the effort.

Regards

Jerry 4107 1120