the RCBO was a 16A one.
the paddles were floppy, no possibility of re-engaging it, so it was entirely u/s.
Thinking aloud, I think the RCBO was at its limit, the solar array is capable of 4.8kW peak, the inverter is 5kW, so let's say 4.5kW with inverter losses. Our grid is 245V, so that makes...