The PV inverter leakage switch trips

What is a leakage path in an inverter?

Other leakage path is EMI (RF interference) filters put in inverter AC input and AC output ports to reduce switching noise escaping onto AC port wiring. The small value RF filter bypass capacitors are connected to inverter case ground creating a small AC leakage path to ground.

What causes ground leakage on PV / inverter systems?

This pertains to loads downstream of RCD breaker. There are two typical leakage paths to ground on PV / inverter systems. PV panels can have some leakage from PV cell connections to panel frame from delamination of plastic backing seal when moisture intrudes into the edge delamination.

Can a solar inverter cause a trip?

Depending on the design of the electronics within the inverter it is possible that a leakage to earth from the panel could result in a trip. One way of determining this would be to switch off the isolator for the PV and see if you get any more trips, if that cures the issue the solar system in some way looks like the culprit.

Can a transformer-less inverter cause DC current leakage to ground?

In photovoltaic systems with a transformer-less inverter, the DC is isolated from ground. Modules with defective module isolation, unshielded wires, defective Power Optimizers, or an inverter internal fault can cause DC current leakage to ground (PE - protective earth). Such a fault is also called an isolation fault.

Why does my inverter keep tripping?

Sticky relays in the inverter can mean too much current will flow and trip your switches in your consumer unit. You’ll need to contact us for further investigation. RCD tripping is caused when there is excess leakage current. RCDs are designed to prevent electrocution and can be very sensitive.

Can a PV inverter trip an RCD?

The technician is incorrect. It is almost certain your PV inverter is transformerless, meaning there is no isolation between the grid and the PV panels. The result is PV leakage currents can indeed trip an RCD though inverters are supposed to check for and fault if such leakage exists though this feature can be disabled.