Coming back to this thread in case anyone is interested ---> I completed my system and ended up running one of the Inverter AC Outputs into a sub-panel with a single RCBO. I also did the N-G bond in the sub-panel.
Prior to attempting this, I tested for Ghost voltage (i.e. induced / phantom voltage) vs Real voltage to make sure my inverter was capable of handling a N-G bond. I tested this using a
Low Impedance (Z) (LoZ) digital multimeter (DMM), which is one way to help identify ghost voltage.
As you can see below, the inverter showed ~half voltage present on L-G and N-G, but when tested using the Low Z feature it showed near zero volts across L-G and N-G, meaning I had ghost voltage, meaning it wasn't real voltage, and it was OK / SAFE to run a N-G bond.
| Test / Measurement | L-N (V) | L-G (V) | N-G (V) |
|---|
| No N-G bond | | | |
| DMM Volts | 240 | 109 | 126 |
| DMM Low 'Z' Impedance | 240 | 0.5 | 0.5 |
| With N-G bond | | | |
| DMM Volts | 240 | 240 | 0 |
See attached final schema and image.
I hope this helps others who have this type of of inverter (or similar) and want to add additional safety (e.g. RCD).
Cheers
EDIT 27-Nov-24: Schema updated to reflect the proper position of the N-G bond (which is based on the discussion
here)
