Inverter Installed - Open Ground?

Bobbo wrote:
It is showing OPEN GROUND because there is electrical potential between the inverter's outlet GROUND pin and its "NEUTRAL" pin. The only way to get this to not show OPEN GROUND is to connect the inverter's NEUTRAL pin to its GROUND pin. The same thing happens with a lot of the inverter generators. We build a "bonding plug" and plug it into an outlet on the generator that fixes that.

This is NOT of concern. This is not power from the utility company. The inverter, like the inverter generators, has a floating NEUTRAL and does not need to have its GROUND pin connected. Read some of the threads on this topic concerning the inverter generators. There are a lot of them. There is disagreement on whether to bond the generators with good arguments on both sides. (The only good argument on the side of bonding the generator is because some EMS units won't let power in if you don't.)

My advice is to contact the manufacturer, merely for your peace of mind, then stop testing the outlet. It is fine.

WARNING: I do not know if bonding is safe with your inverter. I do not know if bonding should be done with your inverter. I am providing this information only so you know what is causing that error message.

Thank you. Your explanation not only makes sense, but it helps me understand the following statement in the manual: "Local regulations may require a true neutral. In this case one of the AC output wires must be connected to the chassis, and the chassis must be connected to a reliable ground. Please note that a true neutral is needed to ensure correct operation of an earth leakage circuit breaker."

-Speak