FWIW..... i have also has issues with earth leakage tripping after power comes back on from load shedding and the inverter earth leakage trips.
Tested all the individual ciruits and appliances and found no issues. After two earth leakages, i just decided to try another make and fitted a Hagar single earth leakage. The proble
seems to have stopped. The hagar isnt even that expensive either. Must have some other parts that are less sensitive inside