They do... It's the safety mechanism that prevents backfeeding in a grid down situation.Right. We were talking about the 'micro-inverters' attached to each panel - like the integrated ones you spoke of. Again, if those things require a source of power, other than what the panel itself could provide, it would surprise me.
Essentially, you could put a 220v plug on a micro-inverter solar panel and plug it into your wall to feed the grid, until the grid goes down, then nothing...
A hybrid inverter cuts power to grid when switching to battery power for the same reason.