Inverter, no battery but Generac ATS?

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    Greg Smith Community Moderator
    Early Adopter

    Adding the Tigo EI Inverter to an existing generator system is possible, but you cannot run the generator while the PV is producing when the grid is down. Any excess PV could backfeed into the generator and blow the regulator board.

    You must use a relay on the inverter AC lines that will open when the grid goes down so that the inverter will shut off. Some generators provide a pretty good sine wave that could trick the inverter into turning back on when the generator starts during a grid outage. If you do not automatically turn off the inverter breaker using the relay, excess PV could backfeed into the generator and irreparably damage it. This damage is not covered by the generator manufacturer.

    Swapping the existing Generac ATS with the Tigo 200A  ATS will eliminate this concern. Our 200A ATS has a built-in energy meter, so you can see your home's consumption and PV production.

    You can read more about this special application in this Help Center article- Generators 101: Basic Overview

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    Richard Berman

    If the inverter was wired between the grid and the generac ATS it would never be connected to the running generator. If the PV was generating enough energy to close the ATS switch then the generator would turn off, no? But I suppose without the relay the PV would backfeed the grid. 

     

     

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    Greg Smith Community Moderator
    Early Adopter

    The inverter would never run if it was upstream of the ATS when the grid goes down. It would have no affect on the ATS or generator operation.

    A line side tap upstream of the ATS would do it. That way when the grid went down the inverter would shut down since it would not detect grid input. Tons of different ways to accomplish this.

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