I have a lathe with an inverter…
It occasionally tripped the RCD…
I recently bought a mill with an inverter… It always tripped the RCD…
It worked fine when I powered it from an extension lead from the house (no RCD in the circuit).
Initially, I suspected that it was a switch on current surge, so I constructed a surge limiter….
It made no difference..!!
This breaker was a “Type A” RCD which worked well for its primary purpose of protecting electrical work outside, but can only cope with a pure AC load. Inverters produce harmonics and spikes on the AC input.
I have now replaced this with a “Type B” RCD, which can cope with an inverter style load, and which enables me to power the mill and the lathe with no problem.
Type B RCDs are also required for EV chargers…
Unfortunately, Type B RCDs are more expensive than Type A..!!
Hope this helps!!
Alan