Inverter.

inverter stopped working yesterday after various micro power outages. no lights on. Dongle no light . Lora transmission unit no light. Tried to reset. No success. Power not tripped. MCB ok. Any ideas

Barnboy73 If it's a hybrid inverter, did you also disconnect the battery when you tried to reset it? I think I've seen suggested that you disconnect all power sources (grid, battery, PV), perhaps wait a few minutes, and then power back up.

There should also be a meter in the mini consumer unit - EM115 or something like that. Is that working (displaying numbers)? If not, seems unlikely that it would fail at the same time, which would make me double-check all MCBs and RCDs all the way back to the incoming supply.

EM115 operational.|Emlite meter operational. Next move?

Barnboy73 Did you try the full power cycle ?

I'm not sure if it's a useful test to power on only the battery. Actually, not sure if you mentioned whether the battery had any lights on.

Battery lights on, on both batteries. Not very electrically minded. Explain full power cycle?

Barnboy73 As I said above, disconnect all power sources from the inverter : grid, battery and PV.