From: "Forrest Christian (List Account)" <lists@packetflux.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Thu, 17 Dec 2020 04:24:20 -0800
Subject: Re: [OT] Solar p;anels
Thread-Topic: [OT] Solar p;anels
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Sorry, missed, this reply two days ago..

The sun is lower on the horizon during the winter, so you want it pointed
more at the horizon.

But first a bit of orientation:  The further north you go the higher the
latitude.   So 90* is at the horizon, i.e. vertical, and 0 degrees would be
at the sky.

So at 45 north yes, you'd want it at 45+15 or 60 degrees.

AT 50 north,  you'd want it at 45+15 or 65 degrees.

An old resource, but still pretty valid is at
nrel.gov/docs/legosti/old/5607.pdf , it's data for different sites, and
will give you a multiplication factor which will tell you the average watts
you will get out of a panel mounted at a given angle in each month.   If
the figure is like 3.0 for a month, you can take your panel wattage (say
300) and multiply it by this figure (3), and get the number of watt hours a
day you'll get (900).  Note that there are average/min/max figures and this
data is from a range of years a while back.



On Tue, Dec 15, 2020 at 8:58 AM Gordon Williams <gwilliams@ncf.ca> wrote:

> Hmm - I think the labels may be wrong on the graph.
>
> Why would it not be latitude PLUS 23.5 deg rather than minus 15 deg as
> you suggest for max power in winter?
>
> You want them MORE angled up to get the sun as it is closer to the
> horizon in winter, not more parallel to the ground.
>
> Wouldn't the panel perform best when it is perpendicular to the suns
> rays at the winter solstice?
>
> Gord Williams
>
>
> On 2020-12-15 9:31 a.m., Forrest Christian (List Account) wrote:
> > Note that this means latitude*minus* 15, or pointing at where the sun i=
s
> on
> > solar noon in about a week from now.   If you engineer for that, then t=
he
> > rest of the year you're golden.
> --
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- Forrest
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