Absorption refrigerators are energy hogs...you put heat in to get cold out which is a pretty neat trick. Having gone residential (BEST mod ever) my electric bill when snowbirding has come down aprox $20/month. A NoCold 1200 uses 450 watts when on electric and they run the majority of the time when it's hot out. My 21 cuft Energy Star refer draws 96 watts and the compressor runs less than half of the time making it 4X more efficient.
Yes, in the summer we dry camp often and my generator time has decreased BUT I added a 100 amp charger to the battery bank/inverter that powers the refer. A residential refer needs two additional batteries if you boondock often.