Solar

 I've been playing with my solar generation figures again.

The chart above (click to enlarge) shows the maxima and minima of solar panel power generation over the last 9 years since having the system installed. The X axis comprises daily kWh generated. Ignore the dates on the Y axis - they all show as 2013, but that's because the axis takes its name from the first column, which happens to be 2013, but is 365 days of the year for each year,

I was surprised at the large gap in the summer months; however, it shouldn't really be that surprising, as a dull day in winter isn't that much different from a dull day in summer, except for the number of hours of daylight and the same dull day in summer will produce far less electricity than a sunny day.

It's interesting to note that whereas the minima curve seems evenly spread around midsummer, the maxima curve is weighted toward the spring.