[chbot] On the angle of solar panels and shading thereof

[Jasper Mackenzie]

Once again, Thanks Robin for these numbers,
 Using them to try and figure out how to mount some panels on a cirular
roof with minimal use of extra standoffs 8)

A great reference!

On 4 June 2014 at 14:27, Robin Gilks <robin at gilks.org> wrote:

> Greetings all
>
> I've just got the results of an interesting experiment on my big solar
> array.
>
> This is in 3 rows on the top of the shed as shown here
>         http://gilks.ath.cx/gallery/index.php/Solar/IMG_1967
> where the angle of the panels is pictured in the 'winter' position of 56
> degrees. The spring/autumn angle is 44 degrees and the summer is almost
> flat at 15 degrees.
>
> I noticed last week that either side of mid-day, I was getting a lot of
> shading from the front and middle rows onto the rows behind so I adjusted
> those 2 rows to their spring/autumn position and that reduced the shading
> from 30% at 11:00am to less than 20%. What I thought was a worth while
> change!! However, the week previous to the change I was getting 18kwhr per
> day but now it was down to 16kwhr - more of a reduction than I expected.
>
> Up on the roof again at the weekend with spanners in hand and put the
> panels back up to their winter position and now back at over 17kwhr per
> day. The change can be seen in the weekly record at
>        http://gilks.ath.cx/solar/
> where 2/6 and 3/6 are noticeably better than the 3 days previous.
>
> The conclusion - angle is more important than shading.
>
>
> --
> Robin Gilks
> Internet: robin at gilks.org    http://www.gilks.org
> Tel:      (+64) (3) 347 4370
>
>
>
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