Henry,
The regon is Southern California, summer is dry and normaly clear. And yes the error is less in summer. Winter is wet by comparison and more grey days but when clear cool so good for making power. The roof area used was the only option at the time (other roof was wood shake). I was also able to ZERO my electric bill for the past two years with the current system and ST 2500, this year I will be under $100 but not Zero. The cause was very poor winter weather for solar power, lots of grey days. I look forward to the improved performance under these grey conditions. I have been selected as an SCE test site, one of 22, for them to look at system performance for owner installed, contractor installed, as well as region (costal, valley, desert). I am by the way using TOU / NET Metering to pull this off with just 2600 watts of solar.
Regards,
Dave Friedeck
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