Module row spacing, N-S? [RE-wrenches]

[William Miller]

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Jeremy:

Here's how I'd solve this:

1. I'd browse to: http://www.susdesign.com/design-tools.html and click on 
Sun angles.  I'd enter in my location information.

2. I'd also enter the earliest hour I'd like to see no shading.

3. I'd click calculate to get my sun altitude angle.

4. I'd sweep up my shop floor.  Lord knows it needs it anyway.

5. I'd chalk out the angle and height of the lower row of modules and then 
a line at the top of that row corresponding to the sun altitude.

6. I'd chalk the roof angle from the bottom of that first row.

7. Where the lines in 5 and 6 meet is where you'd put the base of your 
second row.

(Solved graphically on the floor of my CAD program, in Denver on Dec 21 at 
10:00 AM:  1' 8 3/4", as measured vertically down from the top of the first 
row on the pitch).

If you want the trig solution, I put up a pdf on my web site:

Go to:  http://mpandc.com/
Click on:  Downloads
Click on: Sloped roof solution.pdf

(The key is the ratio of the two angles that make up the left vertices on 
the non-right green triangle and applying that ratio to divide the base 
into non-equal parts.)

Hope this helps.

William















At 04:50 PM 1/28/2006, you wrote:

>Jeremy, the easy answer, that's safe for all US continental latitudes, is 3
>times the vertical difference between the back of one row and the front of
>the next row. That'll give you enough space to avoid shading at 10am on Dec.
>19th.
>
>If space is tight, then get out the trig books, or I'm sure one of the
>programs on the Solar Design Studio from Maui Solar Software covers row
>spacing.
>
>Cheers,
>Doug Pratt
>DC Power Systems
>
>
>-----Original Message-----
>From: Jeremy Rodriguez [mailto:allsolar at ris.net]
>Sent: Saturday, January 28, 2006 10:51 AM
>To: RE-wrenches at topica.com
>Subject: Module row spacing, N-S? [RE-wrenches]
>
>
>I know this has been answered before but could someone please post the
>formula here?  I would have 2 rows on a 4-12 pitch roof, 18 deg slope
>correct. How far between rows?
>
>Jeremy
>All Solar
>CO USA
=  
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