<html>
<head>
<meta http-equiv=Content-Type content="text/html; charset=us-ascii">
<meta name=Generator content="Microsoft Word 11 (filtered)">
<style>
<!--
/* Font Definitions */
@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}
@font-face
{font-family:"Arial Narrow";
panose-1:2 11 5 6 2 2 2 3 2 4;}
@font-face
{font-family:"Palatino Linotype";
panose-1:2 4 5 2 5 5 5 3 3 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman";
color:windowtext;}
h1
{margin-top:12.0pt;
margin-right:0in;
margin-bottom:3.0pt;
margin-left:0in;
page-break-after:avoid;
font-size:16.0pt;
font-family:Arial;
color:windowtext;
font-weight:bold;}
h3
{margin-top:6.0pt;
margin-right:0in;
margin-bottom:0in;
margin-left:0in;
margin-bottom:.0001pt;
page-break-after:avoid;
font-size:12.0pt;
font-family:Arial;
color:windowtext;
letter-spacing:-.5pt;
font-weight:normal;}
a:link, span.MsoHyperlink
{color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{color:blue;
text-decoration:underline;}
p
{margin-right:0in;
margin-left:0in;
font-size:10.0pt;
font-family:Arial;
color:navy;}
p.alist, li.alist, div.alist
{margin-top:0in;
margin-right:0in;
margin-bottom:0in;
margin-left:.5in;
margin-bottom:.0001pt;
text-indent:-.15in;
font-size:12.0pt;
font-family:"Times New Roman";
color:windowtext;}
p.ahead3, li.ahead3, div.ahead3
{margin-top:6.0pt;
margin-right:0in;
margin-bottom:0in;
margin-left:0in;
margin-bottom:.0001pt;
page-break-after:avoid;
font-size:12.0pt;
font-family:Arial;
color:windowtext;
letter-spacing:-.5pt;}
p.StyleaparaJustifiedAfter0pt, li.StyleaparaJustifiedAfter0pt, div.StyleaparaJustifiedAfter0pt
{margin:0in;
margin-bottom:.0001pt;
text-align:justify;
font-size:12.0pt;
font-family:"Arial Narrow";
color:windowtext;}
p.alistnead, li.alistnead, div.alistnead
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:Arial;
color:windowtext;}
p.anumlist, li.anumlist, div.anumlist
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman";
color:windowtext;}
p.aHead1, li.aHead1, div.aHead1
{margin-top:0in;
margin-right:0in;
margin-bottom:6.0pt;
margin-left:0in;
text-align:center;
page-break-after:avoid;
font-size:16.0pt;
font-family:Arial;
color:windowtext;
font-weight:bold;}
p.StyleHeading3Left0Firstline0, li.StyleHeading3Left0Firstline0, div.StyleHeading3Left0Firstline0
{margin-top:6.0pt;
margin-right:0in;
margin-bottom:0in;
margin-left:0in;
margin-bottom:.0001pt;
page-break-after:avoid;
font-size:12.0pt;
font-family:Arial;
color:windowtext;
letter-spacing:-.5pt;}
p.a-text, li.a-text, div.a-text
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman";
color:windowtext;}
p.apara, li.apara, div.apara
{margin-top:0in;
margin-right:0in;
margin-bottom:6.0pt;
margin-left:0in;
text-indent:.35in;
font-size:12.0pt;
font-family:"Palatino Linotype";
color:windowtext;}
p.StyleHeading1Centered, li.StyleHeading1Centered, div.StyleHeading1Centered
{margin-top:0in;
margin-right:0in;
margin-bottom:6.0pt;
margin-left:.5in;
text-align:center;
page-break-after:avoid;
font-size:16.0pt;
font-family:Arial;
color:windowtext;
font-weight:bold;}
p.Styleapara1TimesNewRomanFirstline025, li.Styleapara1TimesNewRomanFirstline025, div.Styleapara1TimesNewRomanFirstline025
{margin:0in;
margin-bottom:.0001pt;
text-align:justify;
text-indent:.25in;
font-size:12.0pt;
font-family:"Times New Roman";
color:windowtext;
letter-spacing:-.25pt;}
p.PPAhead, li.PPAhead, div.PPAhead
{margin:0in;
margin-bottom:.0001pt;
font-size:16.0pt;
font-family:Arial;
color:windowtext;}
p.aparabullet, li.aparabullet, div.aparabullet
{margin-top:0in;
margin-right:0in;
margin-bottom:0in;
margin-left:.5in;
margin-bottom:.0001pt;
text-align:justify;
text-indent:-.25in;
font-size:12.0pt;
font-family:"Palatino Linotype";
color:windowtext;
letter-spacing:-.25pt;}
p.AAbulllist1, li.AAbulllist1, div.AAbulllist1
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman";
color:windowtext;}
p.AAbulllist2, li.AAbulllist2, div.AAbulllist2
{margin-top:0in;
margin-right:0in;
margin-bottom:0in;
margin-left:1.0in;
margin-bottom:.0001pt;
text-indent:-.25in;
font-size:12.0pt;
font-family:"Times New Roman";
color:windowtext;}
p.Equation, li.Equation, div.Equation
{margin-top:0in;
margin-right:0in;
margin-bottom:6.0pt;
margin-left:0in;
text-align:center;
font-size:12.0pt;
font-family:"Times New Roman";
color:windowtext;}
p.WrightPara, li.WrightPara, div.WrightPara
{margin-top:0in;
margin-right:0in;
margin-bottom:0in;
margin-left:.25in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman";
color:windowtext;}
p.ABULL, li.ABULL, div.ABULL
{margin-top:0in;
margin-right:0in;
margin-bottom:0in;
margin-left:.5in;
margin-bottom:.0001pt;
text-indent:-.25in;
font-size:12.0pt;
font-family:"Times New Roman";
color:black;}
span.EmailStyle35
{font-family:Arial;
color:navy;}
@page Section1
{size:8.5in 11.0in;
margin:1.0in 1.25in 1.0in 1.25in;}
div.Section1
{page:Section1;}
/* List Definitions */
ol
{margin-bottom:0in;}
ul
{margin-bottom:0in;}
-->
</style>
</head>
<body lang=EN-US link=blue vlink=blue>
<div class=Section1>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>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 21<sup>st</sup> (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%.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>- Peter</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Peter T. Parrish, Ph.D., President<br>
California Solar Engineering, Inc.<br>
820 Cynthia Ave., Los Angeles, CA 90065<br>
CA Lic. 854779, NABCEP Cert. 031806-26<br>
<a href="mailto:peter.parrish@calsolareng.com"><font color=navy><span
style='color:navy'>peter.parrish@calsolareng.com</span></font></a> <br>
Ph 323-258-8883, Mobile 323-839-6108, Fax
323-258-8885
</span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt'> </span></font></p>
</div>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>William Miller<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, December 08, 2009
8:30 AM<br>
<b><span style='font-weight:bold'>To:</span></b> ryan@solar4maine.com;
RE-wrenches<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [RE-wrenches] Array
separation</span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Ryan:<br>
<br>
Look on <a href="http://millersolar.com/resources/resources.html"
eudora=autourl>http://millersolar.com/resources/resources.html</a> The
tool is called "Inter-row shading solution". Let me know if you
have any questions.<br>
<br>
William Miller<br>
<br>
<br>
<br>
At 03:21 AM 12/8/2009, you wrote:<br>
<br>
</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>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.<br>
Sent from my BlackBerry® wireless device from U.S. Cellular<br>
_______________________________________________</span></font></p>
</div>
</body>
</html>