Freezers stay cold a long time, particularly if you throw a blanket or 2 over them. Even without the blanket, my chest freezer stays frozen 24 hours or more. I run my Kubota 9kw diesel generator about 4 hours in the evening, and then again in the morning if I am trying to conserve fuel, but at less than .4 gal/hour and 50 gallons in a drum, I really don't need to worry about prolonged outages. Here is a link to info on the unit:
Kubota 9,875 Watt Diesel Generator
Remote start from the house and a manual transfer switch is all the convenience I need.
Why fool around with Northern junk?