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We installed a 14.7 kW solar PV system and are now installing a 22 kW whole house backup generator. The solar panels and SolarEdge inverter are on our barn, because its roof had the best sun exposure. The panels on roof of the barn connect to the inverted inside the barn, which connects to a 100A sub-panel also inside the barn, which is then connected to the main panel in the house on a 100A breaker. So far, this has worked fine. But, we then installed a 22 kW whole house NG backup generator, which connects at the service entrance. In the event of a power failure, the generator will kick in automatically, but because of the way the PV system is connected, the generator will feed power to the inverter (and if the sun is out the inverter will push power back to the generator). My concern is that either the generator or the inverter will suffer damage. I can manually disconnect the inverter at the barn, but that's only an option if I leave the generator in manual mode (it's designed to self-start and self-test, so I'd prefer not keeping it shut off).

The only solution I can think is to add some type of module that would disconnect the barn in the event of a power failure, or automatically disconnect the inverter. Even when the generator is working in automatic mode, there is an approximate 40 second window before the generator restores power; during that 40 seconds, all power is out (and the inverter at that point is shut down). I can envision something as simple as a relay that is tripped when power is lost, and remains so until manually reset. If such a relay was installed between the inverter and the sub-panel, it would disconnect the inverter as soon as power was lost (and stay disconnected); the inverter would never come back on and would never tangle with the generator.

Does something like this exist? Has anyone encountered a similar situation as ours? Any help would be most appreciated. Thanks!
 
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