When Heartland was putting the residential refrigerators in firth 2015 models there was a known problem with the inverters overloading and tripping off. They were using 1000 watt inverters for refrigerators drawing 8.5 amps AC. Interestingly during our last RV shopping we were asking about the main reason for going residential. Every dealer we talked to said cost. Evidently many folks don't dry camp much anymore and when you get to the 18cf refrigerators they were saying it's almost $3,000 dollars wholesale for the norcold units, plus baffles vents, fans etc. and much cheaper for the residential unit and cheap inverter. Of course they don't give you a big enough battery bank to do this for off grid camping, so the actual cost difference will be different once you take care of that issue.