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120VAC is a waste if you are trying to generate power locally. Unless it's just for a few days or a week.

Better to have 12VDC backups of whatever you need. Lights, refrigerator, fans, electronics. Like a semi cab. Then a wood stove for heat and cooking.

Then the 12VDC can come from solar, wind, batteries, car engines, bicycles, etc.

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Everything you talked about generally runs on 120V DC. You are basically suggesting changing everything in your house to save some money on inverter.

It isn't possible to run full-sized fridge on 12V DC with reasonably sized wires. It is more efficient to run 12V generator through inverter, 120V AC over the wires to AC gear, and convert back down to 12V for the things that need it.

I'd like to keep my house running on 12v DC, I lived in an RV for a while and I liked it. All the lighting was 12v LEDs, there was an inverter for the fridge and some plugs. I'd probably do a similar setup, I could probably build the whole thing salvaging a dead RV and buying some lithium iron phosphate batteries. All I really need to run on 120v AC would be a refrigerator or two.

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