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How is solar generation spread across the year?

Posted by Cathy Debenham on 2 December 2014 at 11:35 am

Q: Approximately what is the increase in available light for generation of electricity in April to September compared to the winter months of October to March?

A: While I haven't been able to lay my hands on details of the available light I can illustrate the variations in generation that you will get over the year. The table below shows the predicted figures (which have proved pretty accurate) for my own solar installation in Devon. The figures are for a 2.1kWp array facing south east.









As you can see from the table above, March to the end of September account for the bulk of the solar generation, with only small amounts generated in the gloomy days of November to January.

To see a bigger version of the graph (above), double click on it. The bottom axis is by month.

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3 comments - read them below or add one

Cathy Debenham

Cathy DebenhamComment left on: 22 December 2014 at 9:42 am

Hi @Ingleside Great to hear that your installations are doing so well.

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InglesideComment left on: 19 December 2014 at 4:28 pm

We've been keeping records since our first PV installation in 2009. The month by month figures vary considerably - 2014 was our worst November ever, but our best February, March & June. We now have 2 sets of panels on our house (facing SW and SE), own a further set on our neighbour's (facing SW). Our 3.885 Kw installed have generated 3491 and 3501 in 2012 and 2013, and 3438 to end of November this year. 3.7Kw installed nex door generated 3678 in 2013. Happy to share the spreadsheet if anyone wants more detail.

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Aldous Everard

Aldous Everard from Comment left on: 3 December 2014 at 2:07 pm

This might be overkill, but you can see the light falling on a horizontal surface and onto the plane of PV systems which have registered on the Microgen Database in the maps section.  You can do this for any month and any location that they are generating.

Oh, you can also see what they've been generating.

Here's a link to the page.



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