Help me understand.

One can, with a special meter, and the right setup, feed excess power generated by your panels, back into the grid.

Your inverter however must stop feeding back into the grid, should the Supply Authority switch off the grid for maintenance purposes.

How will your inverter know when to stop exporting if there are multiple inverters exporting simultaneously ?

How does your inverter distinguish between grid power and power exported into the grid from other inverters ?