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We have done this successfully with a SB6000 and four strings
totaling 6.4 and 6.8 kW.<br>
<br>
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<p class="MsoNormal" style=""><span class="il"><b style="">Allan</b></span><b
style=""> Sindelar</b><span style="font-size: 10pt;"><br>
<a href="mailto:Allan@positiveenergysolar.com"
target="_blank"><span class="il">Allan</span>@positiveenergysolar.com</a><br>
NABCEP Certified Photovoltaic Installer<br>
EE98J Journeyman Electrician<br>
<b style="">Positive Energy, Inc.</b><br>
3201 Calle Marie<br>
Santa Fe, New Mexico 87507<br>
<b style="">505 424-1112</b><br>
<a href="http://www.positiveenergysolar.com/"
target="_blank">www.positiveenergysolar.com</a></span></p>
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<br>
On 9/20/2010 6:44 PM, North Texas Renewable Energy Inc wrote:
<blockquote cite="mid:GPEJJFPLCDGEDNGDFOOFCELICIAA.ntrei@1scom.net"
type="cite">
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<div><span class="687453900-21092010"><font face="Arial">The only
potential problem I see might be from one unbalanced string,
shading for instance. </font></span></div>
<div><span class="687453900-21092010"><font face="Arial">Otherwise the
4 <2%r strings feeding back thru a conductor with <1%r
should be no problem.</font></span></div>
<div><span class="687453900-21092010"><font face="Arial">What
could possibly go wrong....</font></span></div>
<div><span class="687453900-21092010"><font face="Arial">Jim</font></span></div>
<blockquote dir="ltr" style="margin-right: 0px;">
<div class="OutlookMessageHeader" dir="ltr" align="left"><font
size="2" face="Tahoma">-----Original Message-----<br>
<b>From:</b> <a class="moz-txt-link-abbreviated" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
[<a class="moz-txt-link-freetext" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>]<b>On
Behalf Of </b>Hans Frederickson<br>
<b>Sent:</b> Monday, September 20, 2010 6:52 PM<br>
<b>To:</b> 'RE-wrenches'<br>
<b>Subject:</b> Re: [RE-wrenches] fewer wires, mo bettah?<br>
<br>
</font></div>
<div dir="ltr" align="left"><span class="573574323-20092010"><font
size="2" color="#0000ff" face="Arial">Marco,</font></span></div>
<div dir="ltr" align="left"><span class="573574323-20092010"><font
size="2" color="#0000ff" face="Arial">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"></span> </div>
<div dir="ltr" align="left"><span class="573574323-20092010"><font
size="2" color="#0000ff" face="Arial">Regards,</font></span></div>
<div dir="ltr" align="left"><span class="573574323-20092010"><font
size="2" color="#0000ff" face="Arial">-Hans</font></span></div>
<div dir="ltr" align="left"><br>
</div>
<div class="OutlookMessageHeader" dir="ltr" align="left"
lang="en-us">
<hr tabindex="-1"> <font size="2" face="Tahoma"><b>From:</b>
<a class="moz-txt-link-abbreviated" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
[<a class="moz-txt-link-freetext" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <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 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>
</blockquote>
<pre wrap="">
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