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<DIV><FONT size=2 face=Calibri>Some of the early (circa 2000'ish) grid tie
inverters (not just Fronius) had problems tracking MPPT at the lower 10-15%
or so of the input voltage range. Not sure if that is related to the
experience you had with that IG4000 or not.</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=peter.parrish@calsolareng.com
href="mailto:peter.parrish@calsolareng.com">Peter Parrish</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> Thursday, July 09, 2009 8:18
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [RE-wrenches] Efficiency
Curves of Fronius Inverters?</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN
style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">I have a decidedly
skeptical opinion of the Fronius MPP algorithm. A few years ago, I was one of
the first (I believe) to notice a curious “continuous saw tooth ramping” of
the DC current and voltage on a couple of Fronius IG4000’s. The problem (I was
told by Fronius) was triggered by an increasing Vdc crossing 240 V (the “line
voltage”). The problem was fixed by a SW upgrade. Ignoring the fact that 240
Vac is not a fixed value, the standard Fronius IG inverter line may have a
generic challenge when Vmp is in the 240 V range. Was this the
case?</SPAN></FONT></P>
<P class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN
style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt"></SPAN></FONT> </P>
<DIV>
<P class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN
style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">-
Peter</SPAN></FONT></P>
<P><FONT color=navy size=2 face=Arial><SPAN
style="FONT-SIZE: 10pt"></SPAN></FONT> </P>
<P class=MsoNormal><IMG hspace=12 align=left
src="cid:4DDF3EFB090A465BB51E99A654575C68@Warren" width=67 height=80><FONT
color=navy size=1><SPAN style="COLOR: navy; FONT-SIZE: 9pt">Peter T. Parrish,
Ph.D., President<BR>California Solar Engineering, Inc.<BR>820 Cynthia Ave.,
Los Angeles, CA 90065<BR>CA Lic. 854779, NABCEP Cert. 031806-26<BR><A
href="mailto:peter.parrish@calsolareng.com">peter.parrish@calsolareng.com</A>
<BR>Ph 323-258-8883, Mobile 323-839-6108, Fax
323-258-8885
</SPAN></FONT></P>
<P><FONT color=navy size=2 face=Arial><SPAN
style="FONT-SIZE: 10pt"></SPAN></FONT> </P></DIV>
<DIV> </DIV></DIV></BLOCKQUOTE></BODY></HTML>