Most utilities require solar or any other generator isolate itself from the grid in the event of a blackout. This is to prevent line workers from being harmed.

Most utilities require solar or any other generator isolate itself from the grid in the event of a blackout. This is to prevent line workers from being harmed. But you are right, before you accept the system from your electrician test isolating from the grid and running loads locally, then re-establishing a connection to the grid.