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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Jeff,<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'>Although some of what you say is true—and anyone allowed
to install SunPower modules should be intimately aware of the positive
grounding requirement—they actually can be installed on ungrounded and
bi-polar arrays with the inclusion of some wiz-bang depolizerinators ;-).<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'>Bottom line is that they are good modules, but like anything in
PV system design—you have to know what you are doing. Learning through
mistakes is painful. I know—I have over 20 years of pain to remind me.<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>
<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>Jeff
Irish<br>
<b>Sent:</b> Friday, March 20, 2009 1:49 PM<br>
<b>To:</b> re-wrenches@lists.re-wrenches.org<br>
<b>Subject:</b> Re: [RE-wrenches] SunPower modules<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:navy'>Word of caution… don’t
wire the bigger SunPower modules with the negative conductor grounded.
With the metal frame grounded, as it should be, this combination causes a
strange surface polarization effect that will discolor the cells and cause the
power output to drop by about half. Fortunately the polarization and
discoloring are totally reversible if the system is re-wired with the positive
conductor grounded (as we found out, even after 6 months of being wired
incorrectly), but it takes a few days to correct. For this same reason,
SunPower modules can’t be used with bipolar inverters.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:navy'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:navy'>Jeff Irish<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:navy'>Hudson Valley Clean Energy</span><span
style='font-family:"Arial","sans-serif";color:navy'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'><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>jay peltz<br>
<b>Sent:</b> Friday, March 20, 2009 9:39 AM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] Sunpower modules</span><o:p></o:p></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hi Larry,<o:p></o:p></p>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal> I was under the impression that Sunpower were only for
on grid?<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>And for off grid with the low voltages that we use, they are
still requiring you to use positive ground? I've seen the white paper
they did and it showed at lower voltages there is no need to positive ground,
thats why for example those 90 watt panels using Sunpower cells are used with
Negative ground.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>curious,<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>jay<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>peltz power<o:p></o:p></p>
<div>
<div>
<p class=MsoNormal>On Mar 19, 2009, at 9:14 PM, Larry Crutcher, Starlight Solar
wrote:<o:p></o:p></p>
</div>
<p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p>
<div>
<p class=MsoNormal>William,<o:p></o:p></p>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>I know you asked Jeff but thought I would respond as all we
do are off grid, battery based systems. I typically see that the Vmp voltage of
Sunpower modules is closer to spec with than with Kyocera, Sharp or Mitsubishi.
In my opinion Sunpower modules are only surpassed by Sanyo. I realize this is
anecdotal but after hundreds of installs you begin to notice these things.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>Larry Crutcher<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<div>
<p class=MsoNormal>On Mar 19, 2009, at 5:46 PM, William Miller wrote:<o:p></o:p></p>
</div>
<p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'>Jeff:<br>
<br>
Have these modules worked for you in battery based systems?<br>
<br>
William Mill<br>
<br>
<br>
At 01:27 PM 3/19/2009, you wrote:<br>
<br>
<o:p></o:p></p>
<p class=MsoNormal>Hiya Jeff,<br>
You are correct that the sunpower modules are positively grounded. You
are<br>
also correct that sunpower only deals with dedicated "dealers".
That means<br>
that if you are not one of their dealers you cannot get their panels. It
is<br>
my understanding that sunpower is always looking for new dealers, so you may<br>
want to check in with them. As far as architectural review committees and<br>
such, we have never had a problem using SPR modules in the areas where<br>
review is an issue. The positive ground really does not affect aanything.<br>
Instead of your negative wire being the grounded (white) conductor it is<br>
your positive conductor that is grounded. This means you are switching
the<br>
negative instead of the positive in the DC disco. Sunpower sells packaged<br>
systems, so they provide positive ground inverters from different<br>
manufacturers.<br>
<br>
Evergreen now has a black framed module, and I believe Sharp does too. I<br>
hope this helps, any other questions feel free to contact me. <br>
Jeff Blick<br>
Lead PV Installer<o:p></o:p></p>
</div>
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