This data shows that 2012 was just slightly worse than long-term average for total hours of sunshine, so our domestic PV over-performance (see previous post) was not due to high numbers of hours of sunshine.
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This is a 3.68 kWp domestic array, in two strings, one facing East and the other West. Total yield in the year was about 2,700 KW hours. The installer's annual generation estimate was just under 2,500 at the time of purchase. I'm not sure whether the actual over-performance is because of prudence in the installer's estimate or a better-than-average amount of sunshine last year. Anyway, I'm delighted with the performance so far.
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About the BloggerI'm David Calver - an Accountant with a passion for sustainability. Categories
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