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<DIV><FONT size=2 face=Calibri>The Vmp of those is 33.7 volts, so what you might
want to do is just come up with a set of panels that would equal 10 of the
SX120's within 5% or less. As I recall, the SX120's had a rather poor
temperature coefficient compared to todays panels, so that might be hard to
match up.</FONT></DIV>
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<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>
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<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>Sent:</B> Thursday, February 18, 2010 8:07
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [RE-wrenches] Grid-Tie Upgrade
Problem</DIV>
<DIV><BR></DIV>Fellow Wrenches,<BR>One of our first batteryless grid-tied
installations needs an upgrade and I need to ask this list for suggestions re
how it might be done.<BR><BR>In late 2001 we installed two poles in the ground
at a home. On one pole we mounted ten BP SX120s on a dual-axis Wattsun
tracker. Input fed an SMA SB2500 inverter. The idea was that we would install
1/2 of the system then (what the customer could afford), with the
infrastructure in place to add a second tracked array later. The system has
worked flawlessly since then.<BR><BR>Nine years (!) later the customer wants
to add to the system, and I'd like to use the original approach if at all
possible. We can fit up to around 1500 watts onto the existing inverter, but
it must be in the form of ten 72-cell modules of similar Vmp, temperature
deration coefficient, and fill factor. I am imagining ten 150W 24Vnom
polycrystalline modules, but I don't know of any currently made. <BR><BR>I
thought it would be easy - ten Kyocera KC130s or KD135s, until a coworker
pointed out that these are 12V modules - duh...<BR><BR>Any suggested solutions
out there?<BR><BR>Thank you,<BR>Allan<BR>
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<DIV class=Section1>
<P class=MsoNormal><SPAN class=il><B>Allan</B></SPAN><B> Sindelar</B><SPAN
style="FONT-SIZE: 10pt"><BR><A href="mailto:Allan@positiveenergysolar.com"
target=_blank><SPAN
class=il>Allan</SPAN>@positiveenergysolar.com</A><BR>NABCEP Certified
Photovoltaic Installer<BR>EE98J Journeyman Electrician<BR><B>Positive Energy,
Inc.</B><BR>3201 Calle Marie<BR>Santa Fe, New Mexico 87507<BR><B>505
424-1112</B><BR><A href="http://www.positiveenergysolar.com/"
target=_blank>www.positiveenergysolar.com</A></SPAN></P></DIV></DIV>
<P>
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