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Thread: Non-Net Metered PV system- Grid Tied

  1. #21
    Join Date
    Oct 2007
    Location
    New Jersey
    Posts
    4,737
    Quote Originally Posted by wwhitney View Post
    So on a technical level, what's different about the Downtown Network that makes it harder for the POCO to handle backfeed there?

    Thanks, Wayne
    I'd guess

    A) It's on its own sub-grid
    B) Considered critical infrastructure, unreliable sources need not apply

  2. #22
    Join Date
    Jan 2016
    Location
    Pittsfield MA
    Posts
    17

    Update

    Eversource the utility in question and other utilities within Massachusetts, have net metering caps spilt into two sectors. (Public and Private) both of which in MA are either at the Cap limit or reaching it very soon. If your system size single phase is larger than 10kW or 3phase 25kW (AC output) you are required to apply for System of Assurance Cap allocation. If the Caps are met you are put into the "queue" and would have to wait for the caps to be lifted or increased, which takes for ever in MA. the way around this is to ensure that the system is either a completely off grid system or is a grid tied PV system and you put what the electric company is calling "reverse current relays" in so that if your system was ever producing more than the building was using the system would have to shut down and stop operating.

  3. #23
    Join Date
    Oct 2007
    Location
    New Jersey
    Posts
    4,737
    Quote Originally Posted by bwaryjasz View Post
    Eversource the utility in question and other utilities within Massachusetts, have net metering caps spilt into two sectors. (Public and Private) both of which in MA are either at the Cap limit or reaching it very soon. If your system size single phase is larger than 10kW or 3phase 25kW (AC output) you are required to apply for System of Assurance Cap allocation. If the Caps are met you are put into the "queue" and would have to wait for the caps to be lifted or increased, which takes for ever in MA. the way around this is to ensure that the system is either a completely off grid system or is a grid tied PV system and you put what the electric company is calling "reverse current relays" in so that if your system was ever producing more than the building was using the system would have to shut down and stop operating.
    So, someone in MA figured out that you can't run a reliable grid on renewables alone. Go figure.

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