I am NOT very electrical knowledgeable, but do know a few facts..
If I needed long term 120V - 240V power, I would opt for a small PTO unit in a minute.. That being more power or longer run times than with a portable generator..
We have a portable generator that is duel fuel gas and propane.. If required we would run individual freezers, refrigerator etc, 1 heavy appliance and several lights at a time as needed.. Seamless whole house units seem a specialty application of its own.. At a significant price...
There is a whole culture about homemade generators run by a recycled lawn mower engine, much like the portable units available..
As to homemade generators... I have wondered if you made a frame to run 3-4 Chevy alternators at once, at the speed they need, with the pto, can they be wired in a way to produce 120V power ?? ??
Chevy alternators as I believe they have the built in thing that produces useable 12 auto power directly connected to the alternator..
Experience, facts, details ?? ??