Plus, you’re going to fall out of phase with the rest of the grid and then have a bad time when the grid come back online.
Still, it seems like it should be reasonably easy to have an automatic cutoff that breaks the mains line when mains power goes down and phase syncs your power before switching it back on. This is pretty basic stuff. You’ll also need a bit of storage for smoothing out the power in your house so you don’t get mini brownouts when the AC or Fridge kick on.
