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<DIV><FONT size=2 face=Calibri>I would go with #1. The solar is obviously
undersized for the battery bank he has. Another panel + MPPT should give him
about 25-40% more, depending on temps etc.</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>
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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=markf@berkeleysolar.com href="mailto:markf@berkeleysolar.com">Mark
Frye</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, December 03, 2009 10:22
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [RE-wrenches] Off-Grid Sizing
Case</DIV>
<DIV><BR></DIV><!-- Converted from text/rtf format -->
<P><FONT size=2 face=Arial>Folks,</FONT> </P>
<P><FONT size=2 face=Arial>I have a customer with a 3 year old system in
northern CA:</FONT> </P>
<P><FONT size=2 face=Arial>8 - Deka 370AH, 6V, 2x4 banks - 740Ah @ 24V</FONT>
<BR><FONT size=2 face=Arial>2 - DR2424 120/240V series</FONT> <BR><FONT size=2
face=Arial>4 - EC-120-GL</FONT> <BR><FONT size=2 face=Arial>1 - C40 CC</FONT>
<BR><FONT size=2 face=Arial>1 - 5000W, old portable gas gen</FONT> </P>
<P><FONT size=2 face=Arial>The problem is increased gen runtime probally due
to chronic undercharging.</FONT> </P>
<P><FONT size=2 face=Arial>Based on estimated consumption in the home, I think
he needs about 2X the PV to meet the energy production needs in the summer (5
kWH/day)(30% DOD/day). But in order to get C10 charging during the summer he
would need 5X the PV?</FONT></P>
<P><FONT size=2 face=Arial>Money is and issue. So what should I
recommend:</FONT> </P>
<P><FONT size=2 face=Arial>1 - Increase PV 4X to 5X, add MPPT controller to
get to a PV based system with gen support</FONT> <BR><FONT size=2 face=Arial>2
- Get a 3K to 5K propane gen and and run as a gen based system with PV
support</FONT> <BR><FONT size=2 face=Arial>3 -?</FONT> <BR><FONT
face=Arial> </FONT> <BR><FONT size=2 face=Arial>Mark Frye</FONT>
<BR><FONT size=2 face=Arial>Berkeley Solar Electric Systems</FONT> <BR><FONT
size=2 face=Arial>303 Redbud Way</FONT> <BR><FONT size=2 face=Arial>Nevada
City, CA 95959</FONT> <BR><FONT size=2 face=Arial>(530) 401-8024</FONT>
<BR><A href="http://www.berkeleysolar.com"><U><FONT color=#0000ff size=2
face=Arial>www.berkeleysolar.com</FONT></U></A><FONT size=2
face=Arial> </FONT> </P>
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