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On 11/20/2010 4:36 PM, Mark Frye wrote:
<blockquote cite="mid:61C9EAD8E85A4E7B9F12E0F7F375C6C6@marksdell"
type="cite">
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<div dir="ltr" align="left"><font size="2" color="#0000ff"
face="Arial"><span class="515233300-21112010">From the 2006
white paper:</span></font></div>
<div dir="ltr" align="left"><b>
<p align="left"><font size="1"><span
class="515233300-21112010">"</span>Polarization</font></p>
</b>
<p align="left"><font size="1" face="Helvetica">Incorrect
grounding of SunPower modules can induce<span
class="515233300-21112010"> </span>a surface charge which
would lower the energy<span class="515233300-21112010"> </span>production.
Previously SunPower has announced the</font></p>
<p align="left"><font size="1" face="Helvetica">discovery of the
"surface polarization" effect which creates</font></p>
<p align="left"><font size="1" face="Helvetica">a
non-destructive and reversible accumulation of static</font></p>
<p align="left"><font size="1" face="Helvetica">charge on the
surface of high-efficiency solar cells such as</font></p>
<p align="left"><font size="1" face="Helvetica">SunPower's A-300
cells [9]. When the cells have a high</font></p>
<p align="left"><font size="1" face="Helvetica">positive voltage
with respect to ground,</font></p>
</div>
</blockquote>
<br>
How high though ?? I would think that there might be some<br>
curve that might show how high of V produces how much degradation ?<br>
<br>
I assume that the lower voltage modules in the string work better ??<br>
<br>
Maybe it's the other way around and the high voltage modules work
better<br>
when in a positive grounded system ?<br>
<br>
<blockquote cite="mid:61C9EAD8E85A4E7B9F12E0F7F375C6C6@marksdell"
type="cite">
<div dir="ltr" align="left">
<p align="left"><font size="1" face="Helvetica"> a negative
static</font></p>
<p align="left"><font size="1" face="Helvetica">charge is built
up on the surface of the cell due to current</font></p>
<p align="left"><font size="1" face="Helvetica">leakage through
the glass and the highly insulating front</font></p>
<p align="left"><font size="1" face="Helvetica">surface
anti-reflection coating of the cell. </font></p>
</div>
</blockquote>
<br>
I bet (or hope) that they fix this some day by changing the
composition of<br>
the glass, slightly, maybe.<br>
<br>
Nobody seems to talk about this except for this one paper that we
see.<br>
<br>
boB<br>
<br>
<blockquote cite="mid:61C9EAD8E85A4E7B9F12E0F7F375C6C6@marksdell"
type="cite">
<div dir="ltr" align="left">
<p align="left"><font size="1" face="Helvetica">This negative</font></p>
<p align="left"><font size="1" face="Helvetica">static charge
causes increased surface recombination and</font></p>
<p align="left"><font size="1" face="Helvetica">the performance
of the module is reduced. If the polarity</font></p>
<p align="left"><font size="1" face="Helvetica">is reversed and
the cells are highly negative with respect</font></p>
<p align="left"><font size="1" face="Helvetica">to ground, the
negative static charge is replaced by a</font></p>
<p align="left"><font size="1" face="Helvetica">positive static
charge which restores the module</font></p>
<p align="left"><font face="Helvetica"><font size="1">performance.<span
class="515233300-21112010">"</span></font></font></p>
</div>
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<p><span lang="en-us"></span> <br>
<span lang="en-us"><font size="2" face="Arial">Mark Frye</font></span>
<br>
<span lang="en-us"><font size="2" face="Arial">Berkeley Solar
Electric Systems</font></span> <br>
<span lang="en-us"><font size="2" face="Arial">303 Redbud Way</font></span>
<br>
<span lang="en-us"><font size="2" face="Arial">Nevada City, CA
95959</font></span> <br>
<span lang="en-us"><font size="2" face="Arial">(530) 401-8024</font></span>
<br>
<span lang="en-us"></span><a moz-do-not-send="true"
href="http://www.berkeleysolar.com/"><span lang="en-us"><u><font
size="2" color="#0000ff" face="Arial">www.berkeleysolar.com</font></u></span></a><span
lang="en-us"><font size="2" face="Arial"> </font></span> </p>
<div> </div>
<br>
<div dir="ltr" class="OutlookMessageHeader" lang="en-us"
align="left">
<hr tabindex="-1">
<font size="2" face="Tahoma"><b>From:</b>
<a class="moz-txt-link-abbreviated" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
[<a class="moz-txt-link-freetext" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On
Behalf Of </b>jay peltz<br>
<b>Sent:</b> Saturday, November 20, 2010 4:30 PM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:Allan@positiveenergysolar.com">Allan@positiveenergysolar.com</a>; RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] Positive-ground question re
Sunpower<br>
</font><br>
</div>
Hi Allan,
<div><br>
</div>
<div>I have seen the white paper from Sunpower, ( but don't have a
copy) that shows the losses as the voltage rises if using neg
ground.</div>
<div><br>
</div>
<div>But from memory, if using at low voltages such as two in
series there should be minimal if any "loss" of watts.</div>
<div>If you could use them as singles, for say a 12v system then
there is no loss.</div>
<div><br>
</div>
<div>Jay</div>
<div><br>
</div>
<div>Peltz power</div>
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