[RE-wrenches] Array separation

[Peter Parrish]

I'm sure Bill's tool works well, but if anyone wants a ballpark number. At
35 degrees north latitude, and if you want no obstruction from 9:00 am to
3:00 pm on December 21st (winter solstice), and your rows are E-W, then
space the rows 2.1X the difference between the top of the PV module to the
bottom of the PV module behind it (to the North). Of course if your rows are
not E-W, the calculation is a bit more complex, and what you really want to
check is the percentage of the maximum kWh of production you realize for a
given configuration. Since there are a multitude of 2-3% factors that
degrade a PV system's performance, I would keep the degradation due to
inter-row shading below 2%.

 

- Peter

 

Peter T. Parrish, Ph.D., President
California Solar Engineering, Inc.
820 Cynthia Ave., Los Angeles, CA 90065
CA Lic. 854779, NABCEP Cert. 031806-26
 <mailto:peter.parrish at calsolareng.com> peter.parrish at calsolareng.com  
Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885


 

  _____  

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of William
Miller
Sent: Tuesday, December 08, 2009 8:30 AM
To: ryan at solar4maine.com; RE-wrenches
Subject: Re: [RE-wrenches] Array separation

 

Ryan:

Look on http://millersolar.com/resources/resources.html  The tool is called
"Inter-row shading solution".  Let me know if you have any questions.

William Miller



At 03:21 AM 12/8/2009, you wrote:



It seem's like I remember a program that would give you the physical
seperation between 2 array's? So that the first array doesn't shade the
second. I know it is fairly basic math but if there was a program or website
it would be faster onsite.
Sent from my BlackBerryR wireless device from U.S. Cellular
_______________________________________________

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