If the inverter disconnects from the mains, the turbine may overvolt, above 600 DC volts, which the inverter does not like. Mine 'poped' one capacitor and I shut it down, without more damage. This was after 6kw of DC radiators (heat sinks) had been fitted as an overvoltage protection device. The inverter is being rebuilt and a better DC overvoltage protector is going to be fitted. The cause of the inverter disconnecting from the grid does not matter, it could had been due to a power cut, which could occur at any time and is most likely to occur if an overhead power line comes down in strong wind, the very time that the turbine is producing maximum power.
The important thing is that these problems are not unique one-offs, they are known to Proven and their distributors/installers and it is up to them to find a way of making safe, efficient installations, every time. So far I have had 10 weeks downtime and 4 weeks running time, since 30 May, mostly due to waiting for spare parts. I am going to insist on the clock for the warranty being reset, to start once the teething problems are sorted.