January has been a little mixed so far - some poor days and a couple of better ones. Plus a couple of moderately good days (well beyond the forecasted conditions). It's always nice to get a handful of units produced that weren't expected.
However, it now looks like we're heading into a period of high pressure - clear skies, frosts and plenty of winter sun for the panels to lock into. Today (13/1/12) looks like being a 10 kWh day, but it's hard to tell exactly, but either way we wont be far out. If this weather holds for next few days than an average 7-8 units for 5 days will do wonders for the performance against target. Whilst I don't expect to beat the performance target by much, it's always nice to sit back and enjoy all that free power.
It's nice to see the evenings starting to get lighter, its only a few minutes a day, but given that this starts to overlap with my evening commute home, it's most welcome. The mornings wont start to change for my morning commute for quite some time (maybe March), but it's nice to see some signs that the seasons are starting to change.
On a separate note, I managed to get up the loft recently and get a rough measure of the pitch of the roof. According to my rough calculations, the roof's pitch is a little over 45 degrees, maybe closer to 47 degrees. For some reason I'd always assumed it was closer to 50, but now I know. I've subsequently reworked the power factor values for the table at the top of this blog to reflect this. In theory this will make a slight change to the performance of the system, but is likely to be slight.
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