I now have over six years of production data for my system which was turned on May 18, 2012. The data presented is over an annual period from June 1 to May 31. Linear regression suggests a roughly 0.78% per year loss however, the chart appears to indicate a faster decline over the first two years and slower decline over the subsequent four years. Obviously, the fluctuation in weather year to year is another factor that is not considered and may be significant. However, we do have a lot of clear skies here.
ScreenHunter_02 Jun. 02 12.01.jpg
ScreenHunter_03 Jun. 02 12.02.jpg
ScreenHunter_02 Jun. 02 12.01.jpg
ScreenHunter_03 Jun. 02 12.02.jpg
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