Sunday, 2 February 2014

solar stats for January

I blogged the detailed solar power generation through the day for the first few days after we had the system installed.  Not we have more data, here are the plots for all of January (starting on the 9th), using Tuftian "small multiples".

Data is gathered at 10 minute intervals. The horizontal time axis runs from 3:00am to 9:00pm GMT. The vertical axis runs from zero to 8kW. The orange regions indicate the lower quartile, median, upper quartile, and maximum generation at that time, over the month. (Click to embiggen.)
That shows very well how variable the weather can be, from day to day, and from hour to hour.

Each day’s generation can be integrated, to show total power per day.

Daily power generation, in kWh (grey bars), along with a running average (lower quartile, median, upper quartile, maximum; orange areas), over the previous 7 day sliding window.

And that also shows how variable the weather can be from day to day, and how January got steadily gloomier.  But even a median generation of 10kWh/day is better than a poke in the eye with a burnt stick.

Rather than continually blog about all this, I’ve set up a page on my other website, which will keep the up-to-date charts.

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