On Friday, 25 May 2012 09:51:24 UTC+1, The Natural Philosopher wrote:
harry wrote:
BTW, I have had a 3.88 Kwp arrray for 13 months now. Last year I had
4013Kwh of electricity. I cut my electric bill by 25% but we are at
home to make use of free electricity.

So thats and average of 457 watts .
From 3.88 KW capacity panels.

A capacity factor of 11.7%.

I'm surprised you believe that nocturnal generation was expected...

Matt