Seven years ago I blogged about us having a 3.64kW solar PV system installed on our roof. I thought it was about time I went through the figures to see how it has performed from the figures I submit each quarter for our FITS payment. This is how it works out:
I’m surprised by the huge difference between the winter quarters and the summer quarters, all except for the last few quarters which are fairly odd-looking, the last quarter of 2017 being far better than any in previous years and the second quarter of 2018 being quite poor. I’ll have to submit the next quarter figure shortly and I expect those to be back over 1,400kWh.
Average generation per year is somewhere around 3,500kWh, well above the estimated figure of 2,900kWh we were given when the survey was done before we decided to go ahead and higher than the national average household annual consumption figure, I believe. The total generated over the seven years will probably come in at somewhere just over 24,600kWh.
With hindsight I think I’d probably consider having more panels installed, but as Western Power don’t appear to be keen to allow domestic installations to feed more than 4kW back onto the grid I’d probably have to find some way to store the power purely for use on-site.