Property is golf club, so almost certainly 10kW minimum. Even with firemans switch the panels are still live. Will be very interesting to see if local news reports the actual cause of the fire. As Dave said, it may well be something non-PV related, but I have seen rumours of cheaper panels causing fires ie Suntech (now defunct) from the USA, and those panels look like cheaper units - you can tell by the amount of white backing sheet that is visible).
One bad practice I see is relying on DC switch in inverter - they tend to be tucked away underneath unit and not clearly visible. Knocking out AC should shut system down anyway, but a clear DC isolator is still very useful in my opinion. Either way, it only takes a simple poor connection in any part of the DC chain to cause issues. Having once managed to cause a dc fire at an inverter I was changing (pulled connection without tuning DC off) it is quite scary how DC propogates a fire, but that was on a string carrying 800V. Think in future I might go back to multi-stringing arrays to keep voltages down and half the power behind any faults.
