Days of the month on the horizontal axis, daily kWh generated on the vertical. The black line shows the average value rising slightly over the month, as would be expected as the sun gets higher in the sky from the winter solstice.
This chart shows the generated values for the year (red) compared to the forecast (green).
In January, there was a total of 34kWh for the month, compared to the forecast of 58.8kWh.
As you can see, January is down again on the predicted amount - a 24.81kWh shortfall for the month, which takes the total predicted shortfall for the year to 48kWh.
If all remaining months perform as per the forecast, the total generation for the year will be 1597kWh, compared with the predicted value of 1645kWh, which is 97% of the forecast amount.
The above chart shows how much electricity our array has generated per hour of daylight, broken down by month. This is an accurate indicator of how the amount of 'usable' sunlight changes in each month (due to height of sun in the sky and amount of cloud cover at our location in the UK). This is for our 2kWh rig, so the values would be double these for a 4kW (16 panel) rig in the same place. I would love to have had a 4kW rig on our roof, but it would only fit 8 panels.
January (at 0.14kWh/hr) has climbed a touch over December (at 0.11kWh/hr). Note the February average is based on only 2 days' readings, so is wildly inaccurate (Feb 2nd was sunny all day long, and brought in 4.5kWh - not something we can expect for the rest of the month!)
One of the things that has surprised me since having the solar panels installed is how big the difference is between summer and winter generation. With December generating only 27.8kWh, and a forecast for May of 228kWh, that means May generates over 8 times as much electricity as December.
To make up the 48kWh shortfall, the months May-August will only have to outperform the forecast by 5.7%.
We'll just have to wait and see what happens!
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