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<DIV>Good on the buss bars Wayne. Using them removes the concerns about
multiple strings and increases redundancy and system stability. You won’t
need 4/0 between single strings and the buss bar, you can probably easily use
smaller cable, just size it for the individual string. 4/0 to the inverter
of course.</DIV>
<DIV> </DIV>
<DIV>I echo the concern about the higher voltage bank though. Most
off-grid systems have some low voltage DC elements, or at least offer the
opportunity to add them, so the higher voltage could be a problem, especially
during equalization. If you use the buss bars, keep system voltage high
enough, and the batteries are well-cared for, it shouldn’t be necessary to add
that one extra battery.</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=wayne@pureenergysolar.com
href="mailto:wayne@pureenergysolar.com">Wayne Irwin</A> </DIV>
<DIV><B>Sent:</B> Tuesday, May 31, 2011 2:05 PM</DIV>
<DIV><B>To:</B> <A title=re-wrenches@lists.re-wrenches.org
href="mailto:re-wrenches@lists.re-wrenches.org">Wrenches</A> </DIV>
<DIV><B>Subject:</B> Re: [RE-wrenches] 24 volt Battery Bank
comparison</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV
style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none">No
DC loads at all. <BR><BR><FONT color=#76923c>Wayne Irwin</FONT><FONT
color=#76923c>, EE<BR>Director of Engineering<BR></FONT><FONT color=#76923c>Pure
Energy Solar International Inc. </FONT><FONT color=#76923c><BR></FONT><FONT
color=#76923c></FONT><FONT color=#76923c>State Licensed Solar
Contractor</FONT><FONT color=#76923c><BR></FONT><FONT color=#76923c>License #
CVC56695 </FONT><BR><A
href="mailto:PureEnergySolar@hotmail.com">mailto:PureEnergySolar@hotmail.com</A>
<BR><A href="http://pureenergysolar.net/"
target=_blank>http://pureenergysolar.com</A> <BR><FONT color=#76923c>352
377-6527 Office</FONT><FONT color=#76923c><BR></FONT><FONT color=#76923c>352
336-3299 Fax</FONT><FONT color=#76923c><BR></FONT><FONT color=#76923c>352
316-1637 Cell</FONT><BR>
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style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">The content of this
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<HR id=stopSpelling>
From: bob-o@electronconnection.com<BR>Date: Tue, 31 May 2011 16:59:43
-0700<BR>To: re-wrenches@lists.re-wrenches.org<BR>Subject: Re: [RE-wrenches] 24
volt Battery Bank comparison<BR><BR>
<META name=Generator content="Microsoft SafeHTML">Wayne,
<DIV>I'd recommend against that. To do an effective equalization charge on that
bank you'll need to get the voltage up to at least 2.6-2.7V per cell. That would
mean a 13 cell pack voltage of 34-35V. Got any DC loads at all? Danger, Will
Robinson, Danger! Using the inverter as a charging source? I think you'll
run out of transformer windings or at the very least reduce your amperage output
greatly toward the end of that cycle.</DIV>
<DIV>Hopefully, Jamie can jump in with an opinion here as well.</DIV>
<DIV>Good Luck!</DIV>
<DIV>Bob-O <BR>
<DIV>
<DIV>On May 31, 2011, at 4:28 PM, Wayne Irwin wrote:</DIV><BR
class=ecxApple-interchange-newline><SPAN
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class=ecxApple-style-span>
<DIV style="FONT-FAMILY: tahoma; FONT-SIZE: 10pt" class=ecxhmmessage>Just for a
little extra.<BR><BR><FONT color=#76923c>Wayne Irwin</FONT><FONT color=#76923c>,
EE<BR>Director of Engineering<BR></FONT><FONT color=#76923c>Pure Energy Solar
International Inc.<SPAN class=ecxApple-converted-space> </SPAN></FONT><FONT
color=#76923c><BR></FONT><FONT color=#76923c></FONT><FONT color=#76923c>State
Licensed Solar Contractor</FONT><FONT color=#76923c><BR></FONT><FONT
color=#76923c>License # CVC56695<SPAN
class=ecxApple-converted-space> </SPAN></FONT><BR><A
href="mailto:PureEnergySolar@hotmail.com">mailto:PureEnergySolar@hotmail.com</A><SPAN
class=ecxApple-converted-space> </SPAN><BR><A
href="http://pureenergysolar.net/"
target=_blank>http://pureenergysolar.com</A><SPAN
class=ecxApple-converted-space> </SPAN><BR><FONT color=#76923c>352 377-6527
Office</FONT><FONT color=#76923c><BR></FONT><FONT color=#76923c>352 336-3299
Fax</FONT><FONT color=#76923c><BR></FONT><FONT color=#76923c>352 316-1637
Cell</FONT><BR>
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content of this message is Pure Energy Solar Confidential. If you are not the
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delete this message from your computer system. Thank
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