We’ve had a generator for quite awhile now. It runs on a 1000 gal tank of propane.
I know that the 20 pound (I don’t know how many gallons, maybe 5-10) propane tanks are readily available, usually used for grills and cooking. Larger tanks are available too, but not as common. I don’t know how much run time you’d get out of 20 pounds though. If you have to swap tanks 2 or 3 times a day, that isn’t extremely convenient. But better than no electricity at all.
Wow, a 1000 gal propane tank is humungous! We’re just in a typical suburban neighborhood. One time, just for grins, we got a rough estimate on how much it would cost to get a 500 gal. propane tank installed, the largest that we could fit in. Including reconfiguring the house for it, $15-20K, plus whatever we’d pay for the generator. No doubt it’d be even more now! Problem is there is no suitable space to bury the tank anywhere near where the electric panels are. There is really only one place it could go, actually, and naturally it is the most inconvenient, farthest away place.
We have a friend who lives on substantial acreage and has a 1000 gal tank. She says it is extremely expensive to fill, but worth it to her because she lives alone with nearest neighbors pretty far away, and the generator is always on standby. We will have to stick with gas, though! ;-)