We have a 2kW 8 panel solar array (Panasonic HIT panels), mounted on a south-facing roof at approximately 35-40° angle from the horizontal, which was installed at the end of August 2013.
These are the results for September 2015 (in red) with last year's results (purple), year before (green) and distribution by average sunlight 1971-2010 (met office stats) in blue:
The panels have done 234.83kWh this month - up 29.7kWh on last year's results, and up a whopping 56kWh on the value forecast by average sunlight.
With 420 hours of daylight in September (sun up to sun down for all 30 days), the average kWh generated per hour of daylight this month was 0.56kW. September last year was 0.49kW.
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