From: Richard Prosser <rhprosser@gmail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Thu, 17 Dec 2020 11:30:54 -0800
Subject: Re: [OT] Solar p;anels
Thread-Topic: [OT] Solar p;anels
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So if you're at the equator is it +15 degrees or -15 degrees? Shouldn't the
15 degrees scale or something?

RP

On Fri, 18 Dec 2020 at 07:49, Alan Pearce <kiwiantipodean@googlemail.com>
wrote:

> That link worked for me. I haven't gone looking to see if the data is
> available online, the table for Annette, Alaska looks like it would
> suit a UK installation.
>
> On Thu, 17 Dec 2020 at 15:34, Byron Jeff <byronjeff@clayton.edu> wrote:
> >
> > 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 ou=
t
> 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>
> > >
> > >
> > >
> > > *Sent from my etch-a-sketch*
> > >
> > >
> > > On Thu, 17 Dec 2020 at 12:26, Forrest Christian (List Account) <
> > > lists@packetflux.com> wrote:
> > >
> > > > 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 highe=
r
> 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 th=
e
> > > > > 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
> > > > is
> > > > > on
> > > > > > solar noon in about a week from now.   If you engineer for that=
,
> then
> > > > 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
> > > > http://mailman.mit.edu/mailman/listinfo/piclist
> > > >
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> > > View/change your membership options at
> > > http://mailman.mit.edu/mailman/listinfo/piclist
> >
> > --
> > Byron A. Jeff
> > Associate Professor: Department of Computer Science and Information
> Technology
> > College of Information and Mathematical Sciences
> > Clayton State University
> > http://faculty.clayton.edu/bjeff
> > --
> > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
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