Discussion
silentbrown said:
AdamV12V said:
seems hard to believe a 56kwp array would only generate 20kw during a typical whole a day in december, thats barely 30mins of generation. ???
Believe it. It's a perfect storm of stuff that goes on over winter. Midwinter sun only reaches ~20 degrees above horizon in UK, so the low angle of your panels means you're only catching about 30% of available power
on the south aspect, 20% on the north aspect.
Low sun means more atmospheric attenuation
Much shorter days
More cloud, rain etc.
And potentially snow, which isn't going to slide off a 2.5 degree roof of it's own accord...
Our 4.6kW array averaged 2kWh/day in December...
On an 8.7 array with no shade at optimum angles we produced 124kwh in December. However, 40% of that was over 5 days, the rest was very little. The year before we produced 175kwh in December. Its entirely weather dependent.
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