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

[Nick Soleil]

Hi William:
    I got 46.9 degrees from the site.  I feel comfortable calling that 47 
degrees.  


 Nick Soleil
Project Manager
Advanced Alternative Energy Solutions, LLC
PO Box 657
Petaluma, CA 94953
Cell:   707-321-2937
Office: 707-789-9537
Fax:    707-769-9037




________________________________
From: William Miller <william at millersolar.com>
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Sent: Tue, February 22, 2011 9:43:22 PM
Subject: Re: [RE-wrenches] Array tilt angle doesn't matter?

 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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>Content-Language: en-us
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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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