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 April 2015 (in red) with last year's results (green), and distribution by average sunlight 1971-2010 (met office stats) in blue:
The panels have done 269kWh this month, up 42kWh on last year. They've pretty much hit bang on the predicted generation according to the Met Office 1971-2010 average sunlight distribution values, so May has been a perfectly average month this year!
With 465 hours of daylight in March (sun up to sun down for all 31 days), the average kWh generated per hour of daylight this month was 0.58kW.
With 465 hours of daylight in March (sun up to sun down for all 31 days), the average kWh generated per hour of daylight this month was 0.58kW.
Interestingly, there's the blip again. Note that in May last year too (see chart below), there was a similar drop in the average hourly rate.
 |
| yearly averages for 2013-2014 |
I therefore assume that this must be a meteorological anomaly that always occurs during May on the Fylde coast - the increase in daylight hours is not matched by a proportional increase in availability of the sun (cloud cover) - thereby giving the blip.
Weather forecasting by solar panel. Who knew eh!?
No comments:
Post a Comment