Hi All, I've got an acquaintance with a somewhat kludged together off grid system within his grid tied house. (We do not need to get into the random design decisions that went into that...)
It is an EG4 3kw 120v off grid inverter, with one of the EG4 server rack batteries. The system runs most things just fine. We plugged a 12A heat gun into an outlet run by the inverter and it did just fine. He has a Bolt, and the EV charger complains when it is plugged in. The red light on the charger indicates that "System is not properly grounded" but gives no other info than that. When plugged into a house outlet the charger works fine. It even works pluged into an outlet run by the EG4 inverter when the inverter has grid power present. But when grid power is removed from the inverter, then the charger complains about the grounding. I've tested the outlet and am getting 120V L-N, and getting about 2 Ohms from Neutral to ground. The inverter has a ground terminal for the AC input ground. For the output ground, there is just a lug on the inverter Chassis which runs to the backup loads panel. I've tried connecting the ground bar in the backup loads panel to the GEC directly when the inverter is in off grid mode, and removed the wires from the AC input. But still no change. If the house grounding was not good enough, then I would expect the charger to never work. But when only connected to the EG4 inverter, and also connected to the same grounding system, the charger does not work. Has anyone seem anything like this, or have any ideas? Cheers, Dave -- [image: Logo] <https://www.sungineersolar.com/> Dave Tedeyan, P.E. Owner | Sungineer Solar p: he | him | his a: 1653 Slaterville Rd. | Ithaca, NY 14850 w: www.sungineersolar.com <http://www.sungineersolar.com/> c: (607) 270-0370
_______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org
