Inverter

[RegElec]

Hello to all.
I need some advice from the people who know how the internal circuits work on the hybrid inverters. Mine is a 3KVA 24V with a built in charger and solar panel input (none currently connected).

With the Eskom supply on, the socket outlets fed from the sub DB (inverter supplied) are working correctly. The earth leakage tester trips out the unit in the sub DB (Q3). However, if the Eskom supply fails (Q1 main DB off) and the circuit is then supplied from the battery / inverter then the earth leakage (Q3) does not trip.

The EV with Eskom on is 0.15V and when the Eskom power is off and the sub DB is running on the inverter the EV is 45V.

I have measured between the 'raw' neutral at the main DB and the neutrals at the changeover switch on position I and II. Pos I - virtually zero. Pos II - 45V.