I have an off grid system: PV, charge controllers, inverters, and batteries. I want to add a 120V grid input from a GFCI outlet through an extension cord directly into the inverter AC input. However, the GFCI trips when the AC input connects. But only if the ground from the extension cord is connected. Is it necessary to have the ground of the extension cord connected??

I could see an issue where the hot could touch the case of the inverter but the case would have no path back to trip the outlet's breaker. But wouldn't the GFCI protect it?

  • \$\begingroup\$ We need more specs. What inverter, what type of GFCI? Does it also trip when the inverter is off? \$\endgroup\$
    – Jeroen3
    Mar 5, 2019 at 7:20
  • \$\begingroup\$ The inverter is an Outback FXR3048. The GFCI is a Leviton GFTR1-W. I'm not trying to solve the GFCI trip. I just need to know if it meets code to not ground the extension cord. \$\endgroup\$
    – Lost Puppy
    Mar 5, 2019 at 17:50
  • 1
    \$\begingroup\$ Update: I solved this by adding a isolation transformer. The GFCI does not trip and everything is grounded. \$\endgroup\$
    – Lost Puppy
    Jul 4, 2019 at 0:28


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