From: "Forrest Christian (List Account)" <lists@packetflux.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Tue, 15 Dec 2020 06:31:54 -0800
Subject: Re: [OT] Solar p;anels
Thread-Topic: [OT] Solar p;anels
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If you're looking at an off-grid application, generally you want to point
the panel such that it's most efficient on the shortest day of the year,
and engineer for that.

Note that this means latitude*minus* 15, or pointing at where the sun is on
solar noon in about a week from now.   If you engineer for that, then the
rest of the year you're golden.

Note that this means that if you are looking at a chart to maximize the
total solar output over the year you should throw the chart out.   These
are only good for grid-tied applications, and will tell you to point at a
different angle since you're optimizing for maximum year-long-total-output.

There's a nice chart at
https://offgridpermaculture.com/Off_Grid_Energy/Solar_Panel_Tilt_Angle_for_=
Maximum_Power_On_Grid_Off_Grid_Systems.html
which shows the power production for each day of the year at various
angles.  You'll note that latitude-15 is the best for December, and the
rest of the year is better than that.






On Tue, Dec 15, 2020 at 6:17 AM David C Brown <dcb.home@gmail.com> wrote:

> I am contemplating fitting a solar panel tp provide lighting for my
> stables.
> I looked up the recommended angle for mounting the panel and was a little
> surprised.
>
> Azimuth south makes sense but elevation equal to latitude puzzles me sinc=
e
> the sun rarely reaches that elevation.  Here at latitude 53N, my
> calculation is that even at the solstice the sun exceeds that elevation f=
or
> only four hours.  And that from August to May it never exceeds that
> elevation
>
> What am I miosunderstanding
> __________________________________________
> David C Brown
> 43 Bings Road
> Whaley Bridge
> High Peak                           Phone: 01663 733236
> Derbyshire                eMail: dcb.home@gmail.com
> SK23 7ND          web: www.bings-knowle.co.uk/dcb
> <http://www.jb.man.ac.uk/~dcb>
>
>
>
> *Sent from my etch-a-sketch*
>
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