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The voltage of the car generator is not so high. If you want such a high voltage, you can either tow a generator with the engine or use an inverter with your own generator.
Powerwalls are listed as backup generators themselves. Thats how you can have your power on during an outage with powerwalls and a PV system vs no power during a outage with PV only. So you will use a generator to charge your generator in order to power your house. Thats very wasteful.
I purchased a Propane Generator from Central Maine Diesel a few years ago.
20 HP Honda engine, Italian generator head.
Paid about $2300 plus shipping via Paradise Freight which was a few hundred.
I see the price is just a bit higher now... But the one I want most is Yuchai which i saw from a...