Friday, June 14, 2019

Solar System Output over the years

We installed our SolarCity solar system in April 2008. It's made up of 22 panels and rated as 3.96kW DC and 3.2kW AC. Since Tesla is shutting down the Solarguard web site and moving the solar monitoring to the Tesla app only, which will provide only limited historic data, I'm keeping the historic numbers here. Our production in 2008 was a respectable 4551 kWh. For the following years annual production was between 5300 and 6100 kWh, well in line with the predicted output.

Note the impact of morning fog and daytime heat on solar production during the summer months. Some years have a visible dip in output in June and July. Our best months are usually May and August.

The remote read-out used in the inverter started having problems in 2016. Sometimes the wireless adapter on the network side would not connect. Othertimes the controller on the inverter side was dead. This contributed to uneven graphs and unreliable total output sums.


We had a major monitoring outage in the fall of 2018 that was not noticed for a couple months. Power-cycling the adapter helped only for a little while. In February 2019 both the controller in the inverter and the wireless adapter box were replaced, which brought us back to "normal" per month numbers.

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