tedge
Senior Member
- Location
- Camden, ME
I've been discussing this in the contracting forum, but wanted to test the NEC legality of it here.
Situation:
I'm installing a standby generator in a home. I will use an auto-transfer switch to isolate the generator from the grid. The wrinkle is that the house has a grid-tied windmill inverter. I've ascertained that the inverter cannot run while the generator is running for various reasons. I've also found out that the inverter senses the utility AC through the output circuit which is landed on a 2-pole 60A breaker in a sub-panel in the house.
My proposed solution:
Install a relay in the output circuit which will close the circuit with utility power and open it without it, even if the generator is running. I would run a circuit (240v w-grnd) from the transfer switch to a relay with a 240v coil in the house, breaking the output circuit of the inverter.
Is it legal to approach it this way? Again, the entire system will be isolated from the grid by the transfer switch for the generator.
Situation:
I'm installing a standby generator in a home. I will use an auto-transfer switch to isolate the generator from the grid. The wrinkle is that the house has a grid-tied windmill inverter. I've ascertained that the inverter cannot run while the generator is running for various reasons. I've also found out that the inverter senses the utility AC through the output circuit which is landed on a 2-pole 60A breaker in a sub-panel in the house.
My proposed solution:
Install a relay in the output circuit which will close the circuit with utility power and open it without it, even if the generator is running. I would run a circuit (240v w-grnd) from the transfer switch to a relay with a 240v coil in the house, breaking the output circuit of the inverter.
Is it legal to approach it this way? Again, the entire system will be isolated from the grid by the transfer switch for the generator.