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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Geoff,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The ultimate issue is how many cells are in each series string
and is the voltage of the cells nearly the same. As long as the number and the
voltage of the cells match up for each string, it makes no difference what
arrangement the modules are in.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>You could have 5 + 6 + 7 = 18 cells in one group and 3+10+5 =18
cells in another group, and its all good as long as they are similar cells. Unisolar,
due to the low fill factor, is actually pretty forgiving of difference modules
and cells. If you need help, let me know.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Bill.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>Jason
Lombard<br>
<b>Sent:</b> Friday, October 31, 2008 8:55 AM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] mix-n-match Unisolar<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>You are correct and they are
not. The entire string or array will drop the lowest performing panel and
seriously detain performance.<o:p></o:p></p>
<div>
<p class=MsoNormal>On Thu, Oct 30, 2008 at 2:29 PM, Geoff Greenfield <<a
href="mailto:geoff@third-sun.com">geoff@third-sun.com</a>> wrote:<o:p></o:p></p>
<div>
<p>I thought I knew the answer to this one, but wanted to run it by the list.<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>We are responding to a bid where the electrical engineer has designed a
system with different sized Uni-solar laminates in some series strings
paralelled with consistant full size strings. (this was done to work
around skylights etc).<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>We suggested that this was a poor design and will lead to "least common
denomenator" performance, exacerbated by MPPT confusion. The EE
responded that "the bypass diodes allow for this".<o:p></o:p></p>
<p> <o:p></o:p></p>
<p style='margin-bottom:12.0pt'>Any experience with this in practice?<o:p></o:p></p>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'>For a brighter energy future,<br>
<br>
Geoff Greenfield<br>
Founder and CEO<br>
<b><span style='font-size:13.5pt'>Third Sun Solar & Wind Power Ltd.<br>
</span></b>340 West State Street, Unit 25<br>
Athens, OH 45701<br>
<br>
740.597.3111 Fax 740.597.1548<br>
<a href="http://www.Third-Sun.com" target="_blank">www.Third-Sun.com</a><br>
<br>
<i><span style='font-size:13.5pt'>Clean Energy - Expertly Installed<br>
<br>
</span></i><o:p></o:p></p>
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<p class=MsoNormal><br>
<br clear=all>
<br>
-- <br>
Jason Lombard<br>
Open Hand Solar LLC.<br>
HC74 Box13<br>
Pecos, NM. 87552<br>
505 795 8646<o:p></o:p></p>
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