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<DIV><FONT size=2 face=Calibri>The kicker is the large startup, so you may need
to use batteries with low internal resistance, such as the Concorde AGM's. You
will also have to make sure your cables are good for the max current to avoid
any voltage drop which would cause a low voltage shutdown.</FONT></DIV>
<DIV><FONT size=2 face=Calibri></FONT> </DIV>
<DIV><FONT size=2 face=Calibri>Aside from that, just go with around 200-250 AH
of battery storage (assuming 12 volts). A pair of golf car size batteries would
probably work if they are something like Crown or Trojan.</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=Mark@OasisMontana.com href="mailto:Mark@OasisMontana.com">Mark
Dickson</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> Wednesday, March 17, 2010 2:56
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [RE-wrenches] Small Wh and large
LRA</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">Hello Wrenches,
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN
style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">I’ve been asked to
design a battery based PV system for a load that has a high start up surge of
about 62A @ 115V. The thing is, once it is running it will only run for
~10 minutes per day at 11A. So the daily loads are very low. How
do I size a battery bank large enough to handle the large start-up surge, yet
reasonable enough to cover the modest daily load? Is there a
rule-of-thumb for this?<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN
style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></P>
<DIV>
<P class=MsoAutoSig><FONT color=navy size=2 face="Comic Sans MS"><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: navy; FONT-SIZE: 10pt">Best
regards,<o:p></o:p></SPAN></FONT></P>
<P class=MsoAutoSig><FONT color=navy size=2 face="Comic Sans MS"><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: navy; FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoAutoSig><FONT color=navy size=2 face="Comic Sans MS"><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: navy; FONT-SIZE: 10pt">Mark
</SPAN></FONT><FONT color=navy size=2 face="Comic Sans MS"><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: navy; FONT-SIZE: 10pt">Dickson,</SPAN></FONT><FONT
color=navy><SPAN style="COLOR: navy"><o:p></o:p></SPAN></FONT></P>
<P class=MsoAutoSig><FONT color=navy size=2 face=ArialMT><SPAN
style="FONT-FAMILY: ArialMT; COLOR: navy; FONT-SIZE: 10pt">NABCEP Certified
Solar PV Installer ™<o:p></o:p></SPAN></FONT></P>
<P class=MsoAutoSig><FONT color=navy size=2 face="Comic Sans MS"><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: navy; FONT-SIZE: 10pt">Oasis
Montana Inc.<o:p></o:p></SPAN></FONT></P></DIV></DIV>
<P>
<HR>
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