The trick inverter boxes absolutely will not permit power to flow in the event of grid disconnection no matter how it happens.
Next, due to the saturation effects in PV solid state physics they are NOT to be considered an 'infinite bus.' It's the infinite bus character of line power that dictates the performance of OCPD. ( Breakers & fuses )
Having said that, for anything this new, get an opinion from the local AHJ and Poco. Why take a chance they've got an alternate insistence?
