[RE-wrenches] S Facing Mods on E - W slopes

[Jason Szumlanski]

I couldn't agree more. This is where Sketchup shines. (pun intended)

Image below shown at Latitude 25 with 25 degree tilt to south on west
facing roof with 18 degree pitch at 9:00am on 12/21. I don't mind doing the
math, but this is far more fun!


[image: Inline image 1]


Jason Szumlanski

Fafco Solar


On Tue, Sep 23, 2014 at 4:04 PM, William Miller <william at millersolar.com>
wrote:

> Drake:
>
>
>
> I suggest you find a CAD solution.  You can study the shading at specific
> times and some programs will animate.
>
>
>
> William
>
>
>
>
>
> [image: Gradient Cap_mini]
> Lic 773985
> millersolar.com <http://www.millersolar.com/>
> 805-438-5600
>
>
>
> *From:* RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On
> Behalf Of *Drake
> *Sent:* Tuesday, September 23, 2014 7:05 AM
> *To:* RE-wrenches
> *Subject:* [RE-wrenches] S Facing Mods on E - W slopes
>
>
>
> Hello Wrenches,
>
> We have an installation where we are putting modules on the east and west
> slopes of a south facing roof. The roof slopes are 18 degrees. The tops and
> bottoms of the modules will follow the slope of the roof.
>
> There will be 3 rows of modules. I have heard that the shading is
> different in this scenario, that the shadows will be triangular and perhaps
> longer. How can the shading be calculated with this arrangement?  Is there
> a rule of thumb to follow other than the normal of three times the height
> difference?
>
> Thanks,
>
> Drake
>
>
>
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