RCD, RCBO - Nuisance Tripping

When installing Hybrid Inverter systems, or adding additional Hybrid Inverters in parallel to an existing installation, Installers may sometimes experience 'nuisance tripping' of RCD's or RCBO's. These protection devices work on a 'balanced' input output comparison and can trip when there is an imbalance in the electrical circuitry of the property.

In the vast majority of cases this 'nuisance tripping' will not be due to the Hybrid Inverter equipment itself. But rather, it will most likely be as a result of wiring within the electrical circuit of property when a new Hybrid Inverter is installed, or additional Hybrid Inverters are added in parallel to an existing installation and causing an imbalance of a protection device. It may also be due to having the Inverter plus a number of sub-circuits being fed from the same RCD and the total Earth Leakage of all of the sub-circuits combined may exceed the sensitivity rating of the RCD. If the latter is a possibility then you could do a Ramp Test of the Earth Leakage with just the Inverter connected, then one by one turn each sub-circuit on while monitoring the Earth Leakage Current and to see at what point the RCD might trip.

Please review this Sunsynk Instructional Video for further advice and guidance.