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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Here is the way I figure this kind of
problem out.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l3 level1 lfo5;
tab-stops:list .5in'><![if !supportLists]><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;mso-fareast-font-family:Arial;
color:navy'><span style='mso-list:Ignore'>(1)<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>Old modules. Figure out the number of cells and the cell size. For
example 72 cells, 100 mm (4”) square.<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l3 level1 lfo5;
tab-stops:list .5in'><![if !supportLists]><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;mso-fareast-font-family:Arial;
color:navy'><span style='mso-list:Ignore'>(2)<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>New module. If you can, find a module with the same number of
modules and same cell size.<o:p></o:p></span></font></p>
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color:navy'><span style='mso-list:Ignore'>(3)<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>Make sure were are talking the same PV Cell material (crystalline
Si, poly or single)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>To first order, the two modules should
have nearly the same characteristics: Voc, <span class=SpellE>Isc</span>, <span
class=SpellE>Vmp</span> and Imp. You should be able to build a new string with
the same number of modules. Caveat: older modules will show lower <span
class=SpellE>Isc</span> due to the fact that there have been significant
advances in surface treatment (AR coating, surface etching) and in the case of
poly special treatment of the wafer (heat treatment plus H2 gas?).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><span class=GramE><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Failing that, try to
match up total number of cells in the string, keeping cell size the same.</span></font></span><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> I don’t have the SW data at hand but it doesn’t look
like they are a good match.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Don’t give up on SW175s. There may
be someone who has some lying around or the precursor Shell Solar 175-PC. You
might have to fixture them with new connectors. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></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;mso-no-proof:yes'><!--[if gte vml 1]><v:shape
id="_x0000_s1026" style='position:absolute;margin-left:0;margin-top:0;width:50pt;
height:50pt;z-index:1;visibility:hidden' coordsize="21600,21600" o:spt="100"
o:preferrelative="t" adj="0,,0" path="" filled="f">
<v:stroke joinstyle="miter" />
<v:formulas/>
<v:path o:extrusionok="f" gradientshapeok="t" o:connecttype="rect" />
<o:lock v:ext="edit" aspectratio="t" selection="t" />
</v:shape><![endif]-->- Peter<o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy;mso-no-proof:yes'>Peter T. Parrish, Ph.D., President<br>
<st1:State w:st="on"><st1:place w:st="on">California</st1:place></st1:State>
Solar Engineering, Inc.<br>
<st1:address w:st="on"><st1:Street w:st="on">820 Cynthia Ave.</st1:Street>, <st1:City
w:st="on">Los Angeles</st1:City>, <st1:State w:st="on">CA</st1:State> <st1:PostalCode
w:st="on">90065</st1:PostalCode></st1:address><br>
CA Lic. 854779, NABCEP Cert. 031806-26<br>
<a href="mailto:peter.parrish@calsolareng.com">peter.parrish@calsolareng.com</a><span
style='mso-spacerun:yes'> </span><br>
Ph 323-258-8883, <st1:City w:st="on"><st1:place w:st="on">Mobile</st1:place></st1:City>
323-839-6108, Fax 323-258-8885 <span
style='mso-spacerun:yes'> </span><span
style='mso-spacerun:yes'> </span><o:p></o:p></span></font></p>
<p><font size=3 color=navy face="Times New Roman"><span style='font-size:12.0pt;
color:navy;mso-no-proof:yes'> </span></font><o:p></o:p></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> Saturday, January 15, 2011
10:51 AM<br>
<b><span style='font-weight:bold'>To:</span></b> RE-wrenches<br>
<b><span style='font-weight:bold'>Subject:</span></b> [RE-wrenches] Matching
modules into Xantrex GT</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Friends:<br>
<br>
I have a client with a Xantrex GT2.8 inverter. Feeding it are 8 Solar
World SW175 modules. This is half the modules that this inverter can
handle. The client wants to realize the full potential of this
inverter. Adding 8 additional SW175 modules would be ideal, but they are
no longer manufactured.<br>
<br>
I need to find a group of modules to match the 175s. I am contemplating 9
SW240s. The specifications for this match up are below. I imagine
the IV curves are similar for these two modules as they are the same chemistry
and the same manufacturer.<br>
<br>
<x-tab> </x-tab>8-SW175<x-tab> </x-tab>9-SW240<br>
Voc<x-tab> </x-tab>403<x-tab> </x-tab><x-tab> </x-tab>382<br>
<span class=SpellE>Vmp</span><x-tab> </x-tab>283<x-tab> </x-tab><x-tab> </x-tab>275<br>
Imp<x-tab> </x-tab>4.95<x-tab> </x-tab><x-tab> </x-tab>7.87<br>
<span class=SpellE>Pcsi</span><x-tab> </x-tab>1252<x-tab> </x-tab><x-tab> </x-tab>1715<br>
<span class=SpellE>Ptotal</span><x-tab> </x-tab>2.967<br>
<br>
Might this match be close enough? I know this over-powers the inverter
slightly. I imagine that the Xantrex will self regulate this very rare
over wattage condition.<br>
<br>
Comments?<br>
<br>
William Miller<br>
<br>
<br>
<br style='mso-special-character:line-break'>
<![if !supportLineBreakNewLine]><br style='mso-special-character:line-break'>
<![endif]><o:p></o:p></span></font></p>
<x-sigsep>
<p></x-sigsep><u><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Please note new e-mail address and domain:<br>
<br>
</span></font></u>William Miller <br>
Miller Solar<br>
Voice :805-438-5600<br>
email: william@millersolar.com<br>
<a href="http://millersolar.com/" eudora=autourl>http://millersolar.com<br>
</a>License No. C-10-773985<o:p></o:p></p>
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