Performance v Target

The panels face exactly south with a 30º inclination. They are not shaded in any way. The system has a theoretical maximum output of 3·29 kilowatts which at a latitude of 51·49º and Longitude of 0.13º translates to a predicted 2,830 kilowatt hours per annum.

The average predicted daily output (in kWh) for each month and the achievement is as shown below.

2017 - Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Prediction 2.51 4.27 7.32 10.05 12.04 12.7 12.1 11.34 9.29 5.94 3.45 1.83
Achievement 153% 98% 129% 125% 98% 116% 107% 106% 102% 107% 127% 153%


2016 - Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Prediction 2.51 4.27 7.32 10.05 12.04 12.7 12.1 11.34 9.29 5.94 3.45 1.83
Achievement 135% 134% 122% 124% 113% 89% 113% 122% 102% 115% 132% 164%


2015 - Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Prediction 2.51 4.27 7.32 10.05 12.04 12.7 12.1 11.34 9.29 5.94 3.45 1.83
Achievement 152% 127% 131% 137% 117% 118% 110% 93% 116% 104% 74% 124%


2014 - Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Prediction 2.51 4.27 7.32 10.05 12.04 12.7 12.1 11.34 9.29 5.94 3.45 1.83
Achievement 151% 158% 147% 123% 105% 114% 122% 110% 102% 115% 107% 200%



2013 - Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Prediction 2.51 4.27 7.32 10.05 12.04 12.7 12.1 11.34 9.29 5.94 3.45 1.83
Achievement 96% 104% 80% 125% 102% 102% 132% 121% 94% 103% 127% 148%



2012 - Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Prediction 2.51 4.27 7.32 10.05 12.04 12.7 12.1 11.34 9.29 5.94 3.45 1.83
Achievement 150% 149% 142% 105% 99% 94% 105% 115% 129% 107% 136% 152%



2011 - Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Prediction 2.51 4.27 7.32 10.05 12.04 12.7 12.1 11.34 9.29 5.94 3.45 1.83
Achievement 95% 80% 117% 147% 130% 111% 114% 100% 125% 149% 102% 175%

The % figure is extracted dynamically from the source data files each time the current month’s graphing routines are run. If a graph is produced before the day has ended the current month’s figure will read low until the graphing routines are re-run after dark. This can have a significant effect near the beginning of the month.