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<DIV dir=ltr align=left><SPAN class=573574323-20092010><FONT face=Arial
color=#0000ff size=2>Marco,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=573574323-20092010><FONT face=Arial
color=#0000ff size=2>In this case, slightly differing resistance between your
grounded and ungrounded conductors will not make any difference. You will just
need to do your DC voltage drop calculations for each half separately, instead
of the typical voltage drop calculation that uses wire length x 2. Different
resistance in parallel battery cables is an important issue, but that's not
what you're talking about.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=573574323-20092010><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=573574323-20092010><FONT face=Arial
color=#0000ff size=2>Regards,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=573574323-20092010><FONT face=Arial
color=#0000ff size=2>-Hans</FONT></SPAN></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2></FONT><FONT
face=Arial color=#0000ff size=2></FONT><FONT face=Arial color=#0000ff
size=2></FONT><FONT face=Arial color=#0000ff size=2></FONT><BR> </DIV>
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<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <B>On Behalf Of </B>Marco
Mangelsdorf<BR><B>Sent:</B> Monday, September 20, 2010 11:08 AM<BR><B>To:</B>
'RE-wrenches'<BR><B>Subject:</B> [RE-wrenches] fewer wires, mo
bettah?<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal>Check this out.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Four series strings of mods on a same plane roof feeding a
larger Sunny Boy or Fronius inverter.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Four #10 conductors for the ungrounded, fused (at the
inverter) conductors. And for the grounded conductor, a single, common,
larger conductor from those four strings.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>So instead of four pairs of wires, or eight total, I’m using
just five (plus ground).<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Assuming that the larger grounded conductor is adequately
sized taking into account conduit fill and temp derate for exposed conduit, does
anyone see a problem in doing this?<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>I’ve already been doing this for several years with no
problems that I can tell. But it occurred to me whether different
resistances between the ungrounded conductors and the grounded conductor might
be an issue.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Feedback appreciated.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Thanks,<o:p></o:p></P>
<P class=MsoNormal>marco<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P></DIV></BODY></HTML>