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:[email protected]> [email protected] Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885 _____ From: [email protected] [mailto:[email protected]] On Behalf Of William Miller Sent: Tuesday, December 08, 2009 8:30 AM To: [email protected]; 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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