Inverter GFI & bonded panel

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  • stevo
    Member
    • May 2015
    • 45

    #1

    Inverter GFI & bonded panel

    I see in my 24v, 1000 watt, Go Power inverter's owners manual, that supplying a transfer switch hooked to my bonded 200 amp (grid) panel will cause the inverter's GFI to trip. After looking around it seems there are a few solutions. Such as, pay about $450 for an "isolation transformer" or buy the very nice Outback inverter with built in isolation transformer" for something around $1700, way to big for my set up. OR, (not that I would do this) swap out the GFI and install a regular outlet. Wouldn't It cause about as much of a hazard as in the old days before we had GFIs? I know that would be far to risky as kids these days are always sticking their tongues into light sockets.
  • Sunking
    Solar Fanatic
    • Feb 2010
    • 23301

    #2
    Originally posted by stevo
    I see in my 24v, 1000 watt, Go Power inverter's owners manual, that supplying a transfer switch hooked to my bonded 200 amp (grid) panel will cause the inverter's GFI to trip.
    Well I hope so. You just bought the wrong Inverter to be used with TS. Sorry Steve you just gotta bite the bullet, you screwed up. It is your mistake to fix.
    MSEE, PE

    Comment

    • inetdog
      Super Moderator
      • May 2012
      • 9909

      #3
      Originally posted by stevo
      I see in my 24v, 1000 watt, Go Power inverter's owners manual, that supplying a transfer switch hooked to my bonded 200 amp (grid) panel will cause the inverter's GFI to trip. After looking around it seems there are a few solutions. Such as, pay about $450 for an "isolation transformer" or buy the very nice Outback inverter with built in isolation transformer" for something around $1700, way to big for my set up. OR, (not that I would do this) swap out the GFI and install a regular outlet. Wouldn't It would cause about as much of a hazard as in the old days before we had GFIs? I know that would be far to ricky as kids these days are always sticking their tongues into light sockets.
      The simple, and NEC compliant option is to use a three pole transfer switch that also switches the neutral conductor.
      That way when the MTS or ATS is on the generator position the ground to neutral bond in your main panel will not be part of the circuit.

      Even if you bypass the GFCI on the AC output, having one bond at the inverter and one at the breaker panel would still be a code violation and could cause you to fail inspection.
      SunnyBoy 3000 US, 18 BP Solar 175B panels.

      Comment

      • stevo
        Member
        • May 2015
        • 45

        #4
        What about one of these plugged into each GFI? They are about $65 on Amazon, maybe I could get the system up and running with these anyway.

        " PROwatt SWInline Transfer RelayAn easy to mount 15A Inline Transfer Relay provides switching between generator and inverter AC source. It comes with a power plug for convenient connection to the inverter GFCI and a hardwire cord for the AC input and output interface. It is available as an accessory to the Prowatt SW product line.

        Comment

        • inetdog
          Super Moderator
          • May 2012
          • 9909

          #5
          Originally posted by stevo
          What about one of these plugged into each GFI? They are about $65 on Amazon, maybe I could get the system up and running with these anyway.

          " PROwatt SWInline Transfer RelayAn easy to mount 15A Inline Transfer Relay provides switching between generator and inverter AC source. It comes with a power plug for convenient connection to the inverter GFCI and a hardwire cord for the AC input and output interface. It is available as an accessory to the Prowatt SW product line.

          http://www.amazon.com/Xantrex-Inline...859307&sr=8-62
          The "inline transfer switch" seems to be designed to work with a single branch circuit, not a panel feeder, and it is not clear from the info on that page whether or not it transfers the neutral too. One review indicates that it does.
          If it does, it would work for one GFCI protected branch circuit.
          SunnyBoy 3000 US, 18 BP Solar 175B panels.

          Comment

          • stevo
            Member
            • May 2015
            • 45

            #6
            Originally posted by inetdog
            The "inline transfer switch" seems to be designed to work with a single branch circuit, not a panel feeder, and it is not clear from the info on that page whether or not it transfers the neutral too. One review indicates that it does.
            If it does, it would work for one GFCI protected branch circuit.
            Thanks, maybe someone around here has tried one. I'll investigate a little more.

            Comment

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