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<DIV dir=ltr align=left><FONT color=#0000ff size=2 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, 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. 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><!-- Converted from text/rtf format -->
<P><SPAN lang=en-us><FONT face=Arial></FONT></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 href="http://www.berkeleysolar.com/"><SPAN
lang=en-us><U><FONT color=#0000ff size=2
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 lang=en-us class=OutlookMessageHeader align=left>
<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>From:</B> 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> Saturday, November 20, 2010 4:30 PM<BR><B>To:</B>
Allan@positiveenergysolar.com; RE-wrenches<BR><B>Subject:</B> Re: [RE-wrenches]
Positive-ground question re Sunpower<BR></FONT><BR></DIV>
<DIV></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></BODY></HTML>