From: Byron Jeff <byronjeff@clayton.edu>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Thu, 17 Dec 2020 07:32:02 -0800
Subject: Re: [OT] Solar p;anels
Thread-Topic: [OT] Solar p;anels
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Try: https://www.nrel.gov/docs/legosti/old/5607.pdf

That URL came up fine for me.

BAJ

On Thu, Dec 17, 2020 at 01:55:36PM +0000, David C Brown wrote:
> Thanks.  My confusion is mainly due to the fact,that, having worked
> with radio telescopes for forty years, I think od pointing at the horizon
> as being elevation zero
> and pointing at the zenith as being elevation 90.  Having got that out of
> my head I can understand things a little better..
> That link is broken for me
> __________________________________________
> 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>
>=20
>=20
>=20
> *Sent from my etch-a-sketch*
>=20
>=20
> On Thu, 17 Dec 2020 at 12:26, Forrest Christian (List Account) <
> lists@packetflux.com> wrote:
>=20
> > Sorry, missed, this reply two days ago..
> >
> > The sun is lower on the horizon during the winter, so you want it point=
ed
> > more at the horizon.
> >
> > But first a bit of orientation:  The further north you go the higher th=
e
> > latitude.   So 90* is at the horizon, i.e. vertical, and 0 degrees woul=
d 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 w=
atts
> > you will get out of a panel mounted at a given angle in each month.   I=
f
> > the figure is like 3.0 for a month, you can take your panel wattage (sa=
y
> > 300) and multiply it by this figure (3), and get the number of watt hou=
rs 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> wrot=
e:
> >
> > > 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 a=
s
> > > 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 s=
un
> > is
> > > on
> > > > solar noon in about a week from now.   If you engineer for that, th=
en
> > the
> > > > rest of the year you're golden.
> > > --
> > > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> > > View/change your membership options at
> > > http://mailman.mit.edu/mailman/listinfo/piclist
> > >
> >
> >
> > --
> > - Forrest
> > --
> > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> > View/change your membership options at
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> >
> --=20
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--=20
Byron A. Jeff
Associate Professor: Department of Computer Science and Information Technol=
ogy
College of Information and Mathematical Sciences
Clayton State University
http://faculty.clayton.edu/bjeff
--=20
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