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<DIV>
<DIV><FONT face="Lucida Sans">Bob,</FONT></DIV>
<DIV><FONT face="Lucida Sans"></FONT> </DIV>
<DIV><FONT face="Lucida Sans"> Do everyone
a favor and dump the modules. They can be used in classroom demos, power a
greenhouse fan, an inspirational birthday present for the nephew/niece ..... esp
because you want to re-rack! Although you haven't told us if they are
ground or roof or pole mount. Geez, either way, mechanically (racks) and
electrically (mismatches) sounds like a problem.</FONT></DIV>
<DIV><FONT face="Lucida Sans"></FONT> </DIV>
<DIV><FONT face="Lucida Sans"> Looks like
you may have about a C/40 rate for PVs to batt, you need more PV anyway..maybe
you can find some old Arco M53s to (mis)match the other PVs? Better yet,
install a KW of new PV, they seem to have plenty of battery for a few days of
autonomy at just .6KWhrs/day. This may be a little overkill with PV but
with the wide variety of PVs they have, they must have a history of 'load
creep'.</FONT></DIV>
<DIV><FONT face="Lucida Sans"></FONT> </DIV>
<DIV><FONT face="Lucida Sans">Bill</FONT></DIV>
<DIV><FONT face="Lucida Sans">Feather River Solar Electric<BR>4291 Nelson
St.<BR>Taylorsville, CA 95983<BR>530-284-7849/6544 fax</FONT></DIV>
<DIV><FONT face="Lucida Sans"></FONT> </DIV></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=bclark@solar-wind.us href="mailto:bclark@solar-wind.us">Bob Clark</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@lists.re-wrenches.org</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, May 02, 2010 1:29 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [RE-wrenches] Heinz 57 off-grid
array - What should I do with thesolar modules?</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt">Wrenches:<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt">We
were called to assess the status of an off-grid system that is not the worst I
have seen, but it comes close.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt">I
have some preliminary thoughts about system redesign, but would like to hear
from the Wrenches about the array.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt">Givens:<o:p></o:p></SPAN></B></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt">We
will not install anything unless it is to code. It is obvious that none
of the existing system was installed to code.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt">We
will use the existing 24V battery bank consisting of 8, Trojan L16s. The
batteries are still “relatively fresh.”<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt">Pump
is a Franklin pump ˝ hp 115VAC. The CFs dim when the pump
starts.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt">New
load will be a GRINDER PUMP FOR SEPTIC = 2HP, 15amp (240 or 120VAC – more than
likely it will be 240V pump) – Another light dimmer!<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt">Modest
daily electrical load (estimate no more than 600 WHr/day; 25AHr) – they are
<I><U>very good</U></I> at managing their electrical
use.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt">Solar
array – to keep or replace?<o:p></o:p></SPAN></B></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt">8
solar modules – a Heinz 57 mix of older modules - 2 Photowatt PMX500 (Are
these modules UL listed? There did not appear to be a rating label on
the back.) wired in series, 2 Kyocera KC120-1 wired in series, 2 Golden
Genesis PV-75 wired in series, 2 Photowatt PW 1000 12V-24V internally wired
for 24V wired in parallel with the other modules strings – all of these
modules are wired in 5 parallel strings for approximately 34.2Vmp and 20.4Imp,
~695W (STC). Oh, and they need a new mounting structures for the
modules.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt">Should
I try to work with these modules or advise the customer to start over (any
modules that are not UL listed will have to go)?<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt">What
is a good “rule of thumb” for a ratio of PV watts to battery bank capacity per
day of autonomy?<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt">Thanks
for your ideas.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><B><SPAN style="COLOR: #e36c0a; FONT-FAMILY: Papyrus">Bob
Clark<o:p></o:p></SPAN></B></P>
<P class=MsoNormal><B><I><SPAN
style="COLOR: #e36c0a; FONT-FAMILY: Papyrus">SolarWind Energy Systems,
LLC<o:p></o:p></SPAN></I></B></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; LETTER-SPACING: -0.3pt"><o:p> </o:p></SPAN></P></DIV>
<P>
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