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<DIV><SPAN class=015195213-16112011><FONT face=Arial>You will need a fuse for
each inverter for the same reason you would need a fuse for 4 PV
strings. </FONT></SPAN></DIV>
<DIV><SPAN class=015195213-16112011>
<DIV><FONT size=2><FONT face=Arial><STRONG>Jim
Duncan</STRONG></FONT></FONT></DIV>
<DIV><FONT face=Arial size=2><STRONG>North Texas Renewable
Energy</STRONG></FONT></DIV>
<DIV>
<DIV><FONT face=Arial size=2><STRONG></STRONG></FONT> </DIV></DIV><FONT
face=Arial></FONT> </SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org]<B>On Behalf Of </B>Glenn
Burt<BR><B>Sent:</B> Tuesday, November 15, 2011 7:57 PM<BR><B>To:</B>
'RE-wrenches'<BR><B>Subject:</B> Re: [RE-wrenches] combiner bus bar for Sunny
Tower DC input?<BR><BR></FONT></DIV>
<DIV class=WordSection1>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">Are you sure you need to split
them?<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">IIR, there are only a pair of
conductors going from each SB into the tower. They must be combined on the SMA
side of the touch-safe fuse holders in some way.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">We opted to run all our source
circuits from array through 6 external discos then into the ST instead of
combining them – the distance in our case was around
150’.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">-Glenn<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p> </o:p></SPAN></P>
<DIV>
<DIV
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; PADDING-TOP: 3pt; BORDER-BOTTOM: medium none">
<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <B>On Behalf Of </B>Kirk
Herander<BR><B>Sent:</B> Tuesday, November 15, 2011 8:10 PM<BR><B>To:</B>
'RE-wrenches'<BR><B>Subject:</B> Re: [RE-wrenches] combiner bus bar for Sunny
Tower DC input?<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">But I don’t believe the Sunny
Tower internally has single conductor lugs leading to the respective SB
it’s wired to. The DC tower input/output to each respective inverter is
effectively a combiner box which combines all fused inputs to a single
positive prewired to the respective SB inverter. I have already combined the
strings in an external box and need to “uncombine” them through the individual
fused strings in the SunnyTower.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p> </o:p></SPAN></P>
<DIV>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">Kirk
Herander<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">VT Solar,
LLC<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">dba Vermont Solar
Engineering<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">NABCEP<SUP>TM </SUP>Certified
installer Charter Member<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">NYSERDA-eligible
Installer<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">VT RE Incentive Program
Partner<o:p></o:p></SPAN></P></DIV>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p> </o:p></SPAN></P>
<DIV>
<DIV
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; PADDING-TOP: 3pt; BORDER-BOTTOM: medium none">
<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"> <A
href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</A>
[<A
href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</A>]
<B>On Behalf Of </B>Brian Teitelbaum<BR><B>Sent:</B> Monday, November 14, 2011
8:28 PM<BR><B>To:</B> RE-wrenches<BR><B>Subject:</B> Re: [RE-wrenches]
combiner bus bar for Sunny Tower DC input?<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">Hi Kirk,<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">The Sunny Boy inverters also
have a pair of lugs for a single conductor pair coming in from the array. They
are meant to be used if you have an external combiner. No bus bars as you
describe are needed.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">Brian
Teitelbaum<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">AEE
Solar<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p> </o:p></SPAN></P>
<DIV>
<DIV
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; PADDING-TOP: 3pt; BORDER-BOTTOM: medium none">
<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"> <A
href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</A>
<A
href="mailto:[mailto:re-wrenches-bounces@lists.re-wrenches.org]">[mailto:re-wrenches-bounces@lists.re-wrenches.org]</A>
<B>On Behalf Of </B>Kirk Herander<BR><B>Sent:</B> Monday, November 14, 2011
2:57 PM<BR><B>To:</B> RE-wrenches<BR><B>Subject:</B> [RE-wrenches] combiner
bus bar for Sunny Tower DC input?<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Hello,<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>The Sunny Tower has four individual fuse holders on the DC
input of each inverter. I am combining the array output for each inverter in a
combiner box before the tower, so there is only a single positive, negative,
and gnd going to each inverter’s DC input. I want to fan this input out to
each of the four dc fuses via a combiner bus with a single lug and prongs
which fit directly into each fuseholders’ input, ala the Outback combiner bus.
Is there something similar made for the SunnyTower dc input? I have not been
able to talk to SMA yet about this. Thanks.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Kirk Herander<o:p></o:p></P>
<P class=MsoNormal>VT Solar, LLC<o:p></o:p></P>
<P class=MsoNormal>dba Vermont Solar Engineering<o:p></o:p></P>
<P class=MsoNormal>NABCEP<SUP>TM </SUP>Certified installer Charter
Member<o:p></o:p></P>
<P class=MsoNormal>NYSERDA-eligible Installer<o:p></o:p></P>
<P class=MsoNormal>VT RE Incentive Program Partner<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P></DIV></BLOCKQUOTE></BODY></HTML>