How did the solar panels fare over 2016?
Graph 1. Average daily output – with the 2016 production in brown
Graph 2. Monthly output displayed against previous years – 2016 in blue
Graph 3. Monthly output displayed against the average of what we would expect (the green line), and the last four years averaged
And for those that want the hard numbers.
Table 1. The numbers.
|Month 2016||Daily Average kWh||% of expected||Cumulative tonnes of CO2e saved||2012 to 2015 Average %|
So in summary the panels performed as expected in 2016, but overall production was the lowest since 2012.
(In 2012 the year average was 97% of that expected. 2013 – 104%, and 2014 and 2015 were both 105%.)
At the last update we mentioned we were keeping an eye on the problems we were noticing on the inverter readings.
These problems arose over the winter of 2015 and 2016 and the installers R-ECO have promptly come to inspect the panels several times. In January 2017 they visited several times to identify the faulty string. On 29th January 2017 they reported:
“We identified the remains of an old squirrel nest under the third panel from the left on the bottom row. We cleared the nest and found damage to one of the panel cables. We cut off the damaged cable and inserted a short DC extension cable to make up the length removed. We have since been monitoring the SMA portal haven’t seen any insulation resistance faults since. We believe this squirrel damage pre-dates the installation of the squirrel netting so it is likely that this has been the source of the insulation resistance fault for some time.”
This repair costed £1,072 plus VAT.
We very much hope that this is the last of the problems hanging over from our squirrel friends.