Recap: We have a 1.92kW array (8 x 240W Panasonic HIT solar panels) installed on our south-facing roof, at an angle of approx 35-40°. We received a SAP prediction on installation of 1645kWh for the year.
The forecast for October (broken down by average sunlight per month) is 103.76kWh. However, the panels actually achieved only 90.3kWh over the month, which is 87% of the prediction. Here is a graph of the daily totals for the month:
(plus a little bit of November on there too). This underperformance is due to the higher than average number of heavily overcast days.
Here is the graph of the monthly totals to date, shown against predictions:
September overshoot and October's undershoot pretty much balance each other out, so we're still on target for achieving the predicted yearly amount of 1645kWh. Here's to an unseasonably sunny November!
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