Discuss Inverter in the UK Electrical Forum area at ElectriciansForums.net

The fact that connecting the MET to the inverter case seems to cause the inverter to keep shutting down (you mentioned the lights flashing on and off) suggests there may be an existing fault on the installation to real earth, which, via the resistance of the rod, is causing an overload but not a dead short when the circuit is completed by your flylead.

More that that we cannot tell from here. You need to test the insulation of the installation, confirm how / if E & N are connected, etc, as per my post #16. By powering an installation from an inverter (or generator) i.e. your own source of energy, you are taking on some of the responsibilities normally dealt with by the DNO and there are more variables to consider than with an installation supplied from the mains.
 

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