[RE-wrenches] Array tilt angle doesn't matter?

[William Miller]

David:

Here is a handy site:  http://www.susdesign.com/sunangle/

Put in the information from your neighborhood for winter and summer 
solstice and get back to us on the difference.

In my neighborhood, the sun altitude angle at noon on winter solstice is 
about 31.6 degrees.  On summer solstice at noon (not corrected for DST) the 
sun altitude angle is 78.4 degrees.  The difference is 46.8 degrees.

I realize that solar noon is slightly different from clock noon, but the 
answers you get at clock noon should be very close to correct for solar noon.

William Miller



At 05:51 PM 2/22/2011, you wrote:
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>
>Tom,
>
>This is coming from old memory, so I give this with a grain of salt, but I 
>believe the noontime sun angle at my latitude (44.5) is about 78 degrees 
>on June 21st and about 22 degrees on December 21st. That’s a difference 
>of 56 degrees.
>
>David Palumbo
>Independent Power LLC
>462 Solar Way Drive
>Hyde Park, VT 05655
>www.independentpowerllc.com
>NABCEP Certified PV Installer
>Vermont Solar Partner
>23 Years Experience, (802) 888-7194
>
>
>
>From: re-wrenches-bounces at lists.re-wrenches.org 
>[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Tom Elliot
>Sent: Tuesday, February 22, 2011 7:46 PM
>To: RE-wrenches
>Subject: Re: [RE-wrenches] Array tilt angle doesn't matter?
>
>
>“The further north you go the wider the summer to winter sun angle.”
>
>Bob-O.  Explain this one to me please.  The difference between winter 
>solstice and summer solstice sun angle is 47 degrees, everywhere on the 
>planet, even in Hawaii.  I suspect that in higher latitudes a lower sun 
>angle means more atmosphere to affect insolation but the planet, last time 
>I checked, is tilted the same everywhere.
>
>Tom
>
>
>
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Please note new e-mail address and domain:

William Miller
Miller Solar
Voice :805-438-5600
email: william at millersolar.com
http://millersolar.com
License No. C-10-773985
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