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<DIV>William,</DIV>
<DIV> </DIV>
<DIV> Just about a week ago I asked Greg
Smith at SMA to confirm that it would be appropriate to use THWN-2 in the buried
PVC conduit for the DC run from a pole mount array with it's DC disco to the SMA
DC disco below their inverter......Just to be sure you're not thinking you have
to use PV wire all the way back to the DC disco at the inverter. He
confirmed that THWN-2 used for the run from the array disco was AOK.</DIV>
<DIV> </DIV>
<DIV> We have been using Midnight discos
with touch-safe fuses and clear signage to not disconnect under
load.....authorized solar bozos only.</DIV>
<DIV> </DIV>
<DIV>Bill</DIV>
<DIV> </DIV>
<DIV><IMG alt="" hspace=0 src="cid:918B57339035456FAC2418B06BAC13F6@D8XG8YH1"
align=baseline border=0></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=william@millersolar.com href="mailto:william@millersolar.com">William
Miller</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> Monday, October 06, 2014 11:40
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [RE-wrenches] TL inverter with
long DC Feeder</DIV>
<DIV><BR></DIV>
<DIV class=WordSection1>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial','sans-serif'">Wrenches:<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial','sans-serif'">We are getting up
to speed on using transformer-less inverters. I have advocated long for
the additional safety offered by these inverters but I am realizing the
trade-offs with the new technology: The implementation gets more
complicated with the requirement for PV wire, OCPD and disconnecting means for
plus and minus and plus providing Arc Flash rated
equipment.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial','sans-serif'">I am currently
designing a system that will locate the PV about 400 feet from the
residence. The system will utilize 2 Solectria 5200 watt inverters at
the residence. I would like to provide disconnecting means for the 4
strings at the array, in case of any needed service or excavating.
Preferably I’d like the disconnecting means to be deployable by a lay person
(i.e. the gardener).<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial','sans-serif'">Finding an 8 pole,
arc flash, 600 VDC rated disconnect is not easy. I could install an
Outback 8 circuit combiner with 8 touch-safe fuse holders. The new
combiners have had dead-fronts for a while now. The gardener needs only
to have a Philips screw driver to open this cover. Any better ideas out
there?<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial','sans-serif'">Thanks,<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial','sans-serif'">William<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'Arial','sans-serif'"><IMG
id=Picture_x0020_1 height=28 alt="Gradient Cap_mini"
src="cid:61B96F2319594278AB41229B531485C4@D8XG8YH1" width=64><BR>Lic
773985<BR></SPAN><A href="http://www.millersolar.com/"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">millersolar.com</SPAN></A><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'Arial','sans-serif'"><BR>805-438-5600<o:p></o:p></SPAN></P>
<P class=MsoNormal><o:p> </o:p></P></DIV>
<P>
<HR>
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