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William,<br>
<br>
Just to pile on here, if you're running 4 pairs of low-voltage dc
for 400' you may be better off just sticking the inverters right
there at the array and making the long run as 240Vac. #2s on each
inverter output (22A?) would work, keeping voltage drop to 1.3%. If
you choose to combine inverter outputs right there at the array
(you'd need ac disconnects there anyway) you'd have to run #3/0 for
a 1.3% drop. Not sure whether that's more feasible for you.<br>
<br>
DKC<br>
<br>
<br>
<div class="moz-cite-prefix">On 2014/10/7 16:06, Isaac Opalinsky
wrote:<br>
</div>
<blockquote
cite="mid:238255A865D7C643B9D4D08537DDE4EF048CC2EE@EXDBDCA02.sunpowercorp.com"
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">William,
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">What
is your string configuration? The SMA TL inverters have a
very low operating voltage window, going down to 125 Vdc,
but you still have the issue of the disconnect.<o:p></o:p></span></p>
<p class="MsoNormal"><img id="Picture_x0020_1"
src="cid:part1.03050703.08000007@fsec.ucf.edu" height="192"
width="242"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Have
you looked at ABB’s (PowerOne) TL inverters:</span>
<span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><a
moz-do-not-send="true"
href="http://www.abb.us/product/us/9AAC179447.aspx?country=US">http://www.abb.us/product/us/9AAC179447.aspx?country=US</a>?
They can be programmed to operate down to 90 Vdc, and they
give you the ability to combine upstream and have the 2
MPPT’s operate as one, allowing you to combine outside of
the inverter and bring a single set of PV output conductors
to the inverter’s DC disconnect:
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"
style="line-height:12.0pt;text-autospace:none"><b><span
style="font-size:8.0pt;font-family:"Verdana","sans-serif";color:#5F5F5F">Isaac
Opalinsky
</span></b><span
style="font-size:8.0pt;font-family:"Verdana","sans-serif";color:#5F5F5F">|
Technical Trainer |
<b>SunPower Corporation<o:p></o:p></b></span></p>
<p class="MsoNormal"
style="line-height:12.0pt;text-autospace:none"><span
style="font-size:8.0pt;font-family:"Verdana","sans-serif";color:#5F5F5F">Desk
443-569-3476 | Cell 443-277-6286<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
RE-wrenches
[<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>William Miller<br>
<b>Sent:</b> Tuesday, October 07, 2014 12:01 AM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] TL inverter with long
DC Feeder<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Friends:<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">If only an SMA would work here. But DC
volts too low. We are using Solectria PVI5200TLS. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">We do not use PV wire. We transition to
THWN-2 in conduit immediately. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">William<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><br>
Miller Solar<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
On Oct 6, 2014, at 8:30 PM, Chris Mason <<a
moz-do-not-send="true"
href="mailto:cometenergysystems@gmail.com">cometenergysystems@gmail.com</a>>
wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<p class="MsoNormal">I presumed SMA TL series. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">On Mon, Oct 6, 2014 at 10:02 PM,
Jerry Shafer <<a moz-do-not-send="true"
href="mailto:jerrysgarage01@gmail.com"
target="_blank">jerrysgarage01@gmail.com</a>>
wrote:<o:p></o:p></p>
<p>As i read the thread you say TL which TL SMA, AE ect.
They have defferent dc input designs<o:p></o:p></p>
<div>
<div>
<div>
<p class="MsoNormal">On Oct 6, 2014 12:21 PM, "jay
peltz" <<a moz-do-not-send="true"
href="mailto:jay@asis.com" target="_blank">jay@asis.com</a>>
wrote:<o:p></o:p></p>
<div>
<p class="MsoNormal">I do believe the outback
and midnite combiners have a lock hole to
prevent exactly your concern.<o:p></o:p></p>
<div>
<p class="MsoNormal">unauthorized access.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">jay<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">peltz power<o:p></o:p></p>
<div>
<div>
<p class="MsoNormal">On Oct 6, 2014, at
11:40 AM, William Miller wrote:<o:p></o:p></p>
</div>
<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
<div>
<div>
<div>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif"">Wrenches:</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif""> </span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="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.</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif""> </span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="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).</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif""> </span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="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?</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif""> </span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif"">Thanks,</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif""> </span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif"">William</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
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<a class="moz-txt-link-freetext" href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a>
List-Archive: <a class="moz-txt-link-freetext" href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html">http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html</a>
List rules & etiquette:
<a class="moz-txt-link-abbreviated" href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a>
Check out or update participant bios:
<a class="moz-txt-link-abbreviated" href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a>
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