Don't really have a clue what July's generation was as the changeover of the inverter etc has messed up the recordings. However, I do know that on days where we would have expected generation in the region of 30+kw we have only got 18kw because of the inverter constantly disconnecting and reconnecting. I reckon we will be down about 40% when all is said and done on what we should have generated.
Our installers have been monitoring the inverter loads and the corresponding grid voltages - basically the grid voltage ranges from the low 220's up to 270+. When our panels get to about 70% generation, without a drawdown due to demand on site, the grid voltage gets upwards of 260, tripping out at 265v.
They are going to be in further discussions with Western Power - but in the meantime their recommendation is to try and switch on as much stuff as poss when the sun is strong! I've looked into the possibility of an intelligent switch (ie immersun) to kick in when our generation gets up to 3kw and switch on some high load - however an immersion heater is not the answer as we are already drowning in hot water as we have solar thermal panels. We're thinking that maybe we should get some sort of storage heater in the garage or something - though it is irritating that we will have to fork out more money in order to stop our PV system from tripping out all the time.