This is not expert advice so take it for what it's worth, (just what worked for me) I had to remove my GFCI receptacle on the exterior house outlet and replace it with a regular outlet. I used a single 20 amp outlet instead of the 15 amp GFCI duplex breaker. The inverter charger would not work with a GFCI connection. Yes, my breaker in the panel is 20 amp. I use a 25' extension cord, 15 amp rated, dog boned to the 30 amp cord. I also had to change my Xantrex app "Breaker Rating" setting to 15 amps. I am careful to protect the cords and connections from the elements and when I move my E2 away for the traveling season I put the GFCI back in place for safety. Also noticed I can't use an external surge protector at the power pedestal with the integrated EMS that came with the Oliver. I plan to add a 120V, 30-amp outlet in the coming days to resolve my power issues.