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Thread: Automatic load swap for critical load panel backed up by solar/batteries/generator

  1. #1
    Join Date
    May 2017
    Location
    Houston, Texas, USA
    Posts
    1

    Automatic load swap for critical load panel backed up by solar/batteries/generator

    One of our clients has 50+ solar modules on a barn. Two systems: 1) AC grid tie system with 35 modules to reduce overall kWh, and 2) DC hybrid system supplying 12 batteries (topped of by solar and/or Generac 15kW propane generator) which feeds a critical load panel.

    As is, critical load panel contains: Sub Zero refrigerator/freezer, microwave, water well pump, security system, a couple of electrical outlets, and a Mitsubishi ductless room AC.

    Client wants to know if there is a way to automatically or manually swap various appliances (e.g., electrical hot water heater) onto critical load panel during an extended outage.

    What non-static ways exist to be able to select / de-select appliances and loads to fit onto a 62A panel during extended outages or otherwise?

    For instance, if the weather is comfortable and the HVAC is not needed, he'd like to be able to de-select the HVAC and microwave so he could run the washing machine.

    Thank you in advance for any creative, code-compliant solutions or technologies.

  2. #2
    Join Date
    Dec 2012
    Location
    Placerville, CA, USA
    Posts
    17,901
    The only solution that comes to mind is to use a double throw switch or contactor to connect each load alternately to either a normal branch or a critical panel branch. The contacts would have to be non-overlapping (break before make).

    Sent from my XT1585 using Tapatalk

  3. #3
    Join Date
    Sep 2012
    Location
    Clinton, WA
    Posts
    64
    He could install an interlock kit on his main panel and run a feeder from the interlocked branch circuit breaker to a branch circuit breaker in his backup loads panel. When he shuts off his main breaker in the main panel, and turns on the interlocked breaker, the main panel becomes a sub-panel fed from the backup loads panel and he can operate anything he wants. Of course he will have to be competent enough to manage his loads in this scenario. Not a good solution for most people, but could be perfect for someone with some power and energy savvy.

  4. #4
    Join Date
    May 2011
    Posts
    3,687
    Quote Originally Posted by PWDickerson View Post
    He could install an interlock kit on his main panel and run a feeder from the interlocked branch circuit breaker to a branch circuit breaker in his backup loads panel. When he shuts off his main breaker in the main panel, and turns on the interlocked breaker, the main panel becomes a sub-panel fed from the backup loads panel and he can operate anything he wants. Of course he will have to be competent enough to manage his loads in this scenario. Not a good solution for most people, but could be perfect for someone with some power and energy savvy.
    That's a good idea. I actually have a customer who fits the category and might look into that. Thank you.

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