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<DIV><FONT size=2 face=Calibri>Not sure why you think that cell matching is an
incorrect use for MPPT. That is one of it's biggest advantages.</FONT></DIV>
<DIV><FONT size=2 face=Calibri></FONT> </DIV>
<DIV>..................................................................................................<BR>Northern
Arizona Wind & Sun - Electricity From The Sun Since 1979<BR>Solar Discussion
Forum: <A
href="http://www.wind-sun.com/ForumVB/">http://www.wind-sun.com/ForumVB/</A><BR>..................................................................................................</DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=allan@positiveenergysolar.com
href="mailto:allan@positiveenergysolar.com">Allan Sindelar</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>Cc:</B> <A title=joeyh@earthwalk.com
href="mailto:joeyh@earthwalk.com">joeyh@earthwalk.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, June 30, 2009 10:01
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [RE-wrenches] Solar Boost
Controller in Senegal</DIV>
<DIV><FONT size=2 face=Calibri></FONT><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT color=black size=3 face="Times New Roman"><SPAN
style="COLOR: black; FONT-SIZE: 12pt">Walt,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT color=black size=3 face="Times New Roman"><SPAN
style="COLOR: black; FONT-SIZE: 12pt">I would also offer that in a hot
climate, MPPT in general is only useful in a case where odd cell counts take
the Vmp away from 24V nominal specs. That is, MPPT was originally developed to
harvest the voltage headroom between Voc and Vmp, which was greatest in cold
ambient temperatures. There is little benefit to MPPT in a tropical climate,
unless it’s being used (incorrectly in this case) to adapt a particular module
with odd cell count.</SPAN></FONT></P></DIV></BLOCKQUOTE></BODY></HTML>