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I also had the thought that it might be a floating neutral causing the problem. I asked my friend to put in a earth rod and bond the neutral and the earth and this is when he measure the voltage of 0.2V. The 0.2V might indicate that the bonding was not done a 100% correctly, and that there is still some resistance between the neutral and the earth point. I will get him to look at the bonding point an to make sure that is is done correctly. I don't have the info of the inverter with me at the moment, but i will get it and post an update here. THanks for the help.

Hi Guys and Gals! I am hoping that you can assist me, as I am at my whits end. A friend recently asked me to assist with his solar installation. Just some background info on the installation. The installation is normally fed from a 3 phase Eskom supply. And then during a power outage break before make change over switch is used to change over to the solar inverter. The inverter is single phase, and as can be seen in the attached schematic the 3 phase at the bottom of the change over switch has been bridged out, so that no wiring modification had to be done in the existing DB. The problem that occurs is that the earth leakage Q2 in the attached single line keeps on tripping when the supply changeover switch is selected to the solar inverter, but when the supply is selected as the normal Eskom supply it does not trip. Things that i have already checked. The voltage between the Neutral point and earth point on the inverter is 0.2V. The inverter is solidly grounded. Thank you for looking Kind regards Morne As build DB.pdf