Of course you don’t allow your power going out to the grid, that would endanger linemen. I installed a manual lock out transfer switch 20 years ago, as grid was unreliable, use a backup Propane water cooled Koehler generator.
If you understand how to wire a house, powering a house load from the Cybertruck 240v outlet will be easy, if you have room for an additional double Breaker in your main panel.
Max amps is set by the Cybertruck.
Of course you don’t allow your power going out to the grid, that would endanger...