I’ve got an 8kv generac that wold run about a week full time on my propane tank. If I run it about two hours a day I can keep the freezers frozen. With careful planning I can probably keep perishable food for a month
I’ve got a portable 4.6 kv backup as well.
We have an 11KW whole house genny. With the large propane tanks we keep filled I figure we can last 8 months running the genny 2 hrs a day and have enough left over to cook and heat the house. If it went all down today we would be short on food by Christmas. That is not counting the venison that run around here.
I bought some deep cycle batteries on Amazon and a couple of 100 W portable solar cells. I have calculated the wattage pulled by the small fridge and freezer in the garage. Should be able to keep them both going off of the batteries if power goes out. Probably cost me less than $500. I also bought two, 2 cycles generators for about $120 each. One of them will power a small window A/C unit if we are stuck without power for an extended period of time (I live in Texas). These little generators sip gas. People should plan for losing power at some point this summer.