Evening All

I recently install a 5kva hybrid inverter upon doing my test I noticed that when the installation was being fed from the grid all my sockets tested as they should and the earth leakage tripped at 20 ma. When I changed over to the inverter my polarity tester indicated that the earth was now missing from the socket circuits.

I then proceeded to test on the input to the inverter:

L-N = 235 volts
N-E = 0 volts

On the output of the inverter:
L-N= 230 volts
N-E = 90 volts

I then switched the inverter off and had the grid power still feeding the inverter

Input:

L-N = 235 volts
N-E = 0 volts

Output:

L-N = 0 volts
N-E = 24 volts

It seems that the inverter is faulty.