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<DIV><FONT size=2 face=Calibri>In your case, yes the battery cables should also
be 4/0. They are carrying the same load as the inverter cables. Max amp rating
on 2/0 is around 190 amps, and that inverter can surge to well over 250, even
though at 4kw it would pull around 180.</FONT></DIV>
<DIV><FONT size=2 face=Calibri></FONT> </DIV>
<DIV><FONT size=2 face=Calibri>And a nitpick - those are not cells, they
are batteries. Each battery has 6 cells.</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=mick@abrahamsolar.com href="mailto:mick@abrahamsolar.com">Mick
Abraham</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> Friday, February 19, 2010 12:01
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [RE-wrenches] single string of
batts: must the interconnects beinverter size cables?</DIV>
<DIV><FONT size=2 face=Calibri></FONT><FONT size=2
face=Calibri></FONT><BR></DIV>Example: 12 two volt battery cells in one 24
volt string. 4kW inverter/charger has 250 amp DC breaker size and 4/0
cables...as the inverter folks would want.<BR><BR>So...do the "cell to cell"
interconnect cables have to also be 4/0? In the example above, 2/0
interconnects would suffice from the standpoint of basic safety...and even
from the voltage drop standpoint...right?<BR><BR>Inverter company people may
be best qualified to answer this, but any replies will be appreciated. While
I'm at it: do the inverter folks request oversize cables because they want
more capacitance on the DC input...or what?<BR><BR>Jolliness,<BR><BR
clear=all>Mick Abraham, Proprietor<BR><A
href="http://www.abrahamsolar.com">www.abrahamsolar.com</A><BR><BR>Voice:
970-731-4675<BR>
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