Mutiple Array Spacing at 38deg N Latitude [RE-wrenches]

[Dean T. Newberry]

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HI Jeremy,
I went to http://www.susdesign.com/sunangle/ to get the sun altitude 
angle at 10:00 AM for your location  22.41degrees
This site has the trig functions. 
http://www.univie.ac.at/future.media/moe/galerie/wfun/wfun.html

You want leg b and know  leg a and angle (a).
b = cot(a) * a,  cotangent is not a windows calculator function, so...
cot (a) = 1 / tan(a) therefore b = 1 / tan(a) *  leg a,
simplify b = leg a / tan (a)
in your case leg a = 15" the solution then is:
b = 15 / tan 22.4
b = 15 / .412
b = 36.4"

Your row spacing should be at least 36.4" to avoid inter-row shading in 
December between 10AM and 2PM.

The rule of thumb derived for solar thermal collectors, is bascially 
correct for the noon elevation angle, but that is not when you are 
generating power. The tendancy of PV modules to dramatically reduce 
output under only a little shading requires different assumptions.

cul  deant

Jeremy Rodriguez wrote:

>
>Wrenches,
>Can someone confirm spacing of one array to another to be object height x 2.
>I know it depends on your latitude. The site it at 38N
>I have studied some pages sent to me by DP&W but I still have a question.
>Is the object height the height from the roof?
>I have figured out that the highest point of the modules will be 15".  If I use a factor of 2, it seems to be quite a distance to the next mount. 
>Sorry, I normally do pole mounts and this will actually be my first grid connected pv system to install here in Colorado.
>
>Thanks in advance,
>Jeremy
>All Solar 
>CO, USA
>
>
>
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-- 
Dean T. Newberry
Marketing and Sales

Quantum Energy Group
265 Applegate School Road, P.O. Box 158
Applegate, Ca. 95703

Email:  deant at dcn.org

Cell:   530 867-2392
Office:  530-878-4585
Fax:     530-878-6685 

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