This is similar, but more dramatic than what happened to me at the start of August. I suspect that the inverter had disconnected from the grid, either because of a frequency mismatch or an AC overvoltage, This latter occurs at 260 volts AC. If, like me you have a high grid AC voltage, there is not much of a window between the Grid voltage and 260 volts for the inverter to work within. My Grid volts are 253, the highest legal voltage. United Utilities said that they would 'tap' it down to about 240, within 4-6 weeks on May 24 and I still do not know when they are going to do it, however that is another story, which I will tell one day.

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.
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Simonridout