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<DIV><FONT face=Arial size=2>In addition to STC plus/minus 10% being skewed to
minus most of the time, lab testing accuracy is plus/minus 5% (Keith Emery
at NREL).</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=solarcowboy@yahoo.com href="mailto:solarcowboy@yahoo.com">Jerry
Caldwell</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=re-wrenches@lists.re-wrenches.org
href="mailto:re-wrenches@lists.re-wrenches.org">RE-wrenches</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, December 02, 2008 10:18
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [RE-wrenches] CEC module
rating testing</DIV>
<DIV><BR></DIV>
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<DIV
style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman,new york,times,serif">Gents,
thanks for the responses. <BR><BR>Joel's spreadsheet indicates that the
CEC at least was at one time simply using the NOCT & temperature
coefficient of power to determine PTC rating.<BR><BR>Dave, if your attachment
is anything different from what Joel sent I welcome you to send it my
way.<BR><BR>My brother who works for a manufacturer sent me the following
response:<BR><BR>
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<P class=MsoNormal style="MARGIN-BOTTOM: 12pt">"We send our modules out for
testing at ASU's Photovoltaic test lab (now TUV-PTL) I just looked at a
report. Seems data is taken from 3 different test conditions: STC
(1kw/m2 & 25C cell temperature), NOCT (800W/m2, 20C ambient temperature),
Low irradiance (200W/m2, 25C cell temperature). This data is used to
establish the temperature corrections to report data for the PTC conditions
(1kW/m2, 20C ambient).<BR>The report says that the NOCT data was taken
outdoors. The other tests require that the cell temperature be 25C, and
I think for that they must do indoor testing."</P>But as Anthony pointed out,
if STC is the basis for PTC then it all hinges on the manufacturer's +/-
tolerance. This makes it difficult to accurately estimate and compare
system performance of different modules, which is becoming increasingly
important for large systems and PPA's.<BR><BR>Best,<BR>Jerry Caldwell<BR><BR>
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<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> David Katz
<dkatz@aeesolar.com><BR><B><SPAN
style="FONT-WEIGHT: bold">To:</SPAN></B> RE-wrenches
<re-wrenches@lists.re-wrenches.org>; solarcowboy@yahoo.com<BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Monday, December 1, 2008 6:48:16
PM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [RE-wrenches]
CEC module rating testing<BR></FONT><BR>Jerry,<BR>The CEC formula for PTC uses
the NOCT of the module, the STC rating, the power temperature coefficient and
the aperature area of the module. <BR>The data is supplied by the
manufacturer but must make sense. Starting July 1, 2009, this will have
to be certified by an acredited testing lab.<BR>Let me know if you want the
exact formula and i will send it to you. i can't attach anything to this
email<BR>David<BR><BR>
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<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt">David
Katz</SPAN><SPAN></SPAN></P></DIV>
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<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt">President</SPAN><SPAN></SPAN></P></DIV>
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style="FONT-SIZE: 10pt">Redway</SPAN><SPAN style="FONT-SIZE: 10pt">, CA
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<P><SPAN style="FONT-SIZE: 7.5pt">DISCLAIMER: <BR>This communication, along
with any documents, files or attachments, is intended for the use of only the
addressee and contains privileged and confidential information. If you
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<P><SPAN
style="FONT-SIZE: 18pt; COLOR: green; FONT-FAMILY: Webdings">P</SPAN><SPAN
class=GramE><SPAN style="COLOR: rgb(31,73,125)"> </SPAN><SPAN
style="FONT-SIZE: 10pt; COLOR: green"> Please</SPAN></SPAN><SPAN
style="FONT-SIZE: 10pt; COLOR: green"> consider the environment before
printing this e-mail.</SPAN><SPAN
style="FONT-SIZE: 7.5pt"></SPAN></P></DIV></DIV></DIV><BR><BR>Jerry Caldwell
wrote:
<BLOCKQUOTE type="cite">
<DIV
style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman,new york,times,serif">Wrenches,<BR><BR>Can
anyone tell how PTC ratings are determined for modules on the CEC list of
eligible modules? I seem to recall having heard that the manufacturers
provide this data on the honor system. Can anyone verify
this?<BR><BR>The test is obviously more involved than flash testing at
STC. Even though PTC is supposed to simulate more real-world
conditions, it must still require a controlled environment. How
exactly is this done, and how long does it take?<BR><BR>Best,<BR>Jerry
Caldwell<BR>Recurrent Energy<BR></DIV><BR><PRE><HR width="90%" SIZE=4>
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