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<p>PV System Disconnect, not RSS<br>
</p>
<pre class="moz-signature" cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
<div class="moz-cite-prefix">On 2/1/22 7:04 PM, Jeremy Rodriguez
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CY4PR19MB011744F93B2EE81FF09CB497CB279@CY4PR19MB0117.namprd19.prod.outlook.com">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
Just a rated disco at the ground mount? Labeled as the rapid
shutdown switch?
<div>That\u2019s too simple!</div>
<div><br>
</div>
<div>In<br>
<div><br>
<div dir="ltr">Jeremy Rodriguez
<div>Solar Installation / <span style="font-size: 13pt;">Design
Expert </span></div>
<div>
<div>All Solar, Inc.
<div>1453 M St<br>
<div>Penrose Colorado 81240</div>
<div><br>
</div>
<div>Sent by Jeremy's iPhone. Sorry for typos and
shorthand. </div>
</div>
</div>
</div>
</div>
<div dir="ltr"><br>
<blockquote type="cite">On Feb 1, 2022, at 6:49 PM, Lloyd
Hoffstatter <a class="moz-txt-link-rfc2396E" href="mailto:lloyd@sunstruckconsulting.com"><lloyd@sunstruckconsulting.com></a> wrote:<br>
<br>
</blockquote>
</div>
<blockquote type="cite">
<div dir="ltr">\ufeff
<div>
<div>
<div style="color: rgb(0, 0, 0); background-color:
rgb(255, 255, 255);" dir="ltr">
We\u2019ve used multi-pole rated disconnects at the
array.</div>
<div style="color: rgb(0, 0, 0); background-color:
rgb(255, 255, 255);" dir="ltr">
Best regards,</div>
<div style="color: rgb(0, 0, 0); background-color:
rgb(255, 255, 255);" dir="ltr">
Lloyd</div>
<div style="color: rgb(0, 0, 0); background-color:
rgb(255, 255, 255);" dir="ltr">
<br>
</div>
<div style="color: rgb(0, 0, 0); background-color:
rgb(255, 255, 255);" dir="ltr">
Lloyd Hoffstatter </div>
<div style="color: rgb(0, 0, 0); background-color:
rgb(255, 255, 255);" dir="ltr">
Sunstruck Consulting</div>
</div>
<div id="ms-outlook-mobile-signature">
<div><br>
</div>
Get <a href="https://aka.ms/o0ukef"
moz-do-not-send="true">Outlook for iOS</a></div>
</div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font
style="font-size:11pt" face="Calibri, sans-serif"
color="#000000"><b>From:</b> RE-wrenches
<a class="moz-txt-link-rfc2396E" href="mailto:re-wrenches-bounces@lists.re-wrenches.org"><re-wrenches-bounces@lists.re-wrenches.org></a> on
behalf of Jeremy Rodriguez
<a class="moz-txt-link-rfc2396E" href="mailto:allsolarjeremy@msn.com"><allsolarjeremy@msn.com></a><br>
<b>Sent:</b> Tuesday, February 1, 2022 8:31:16 PM<br>
<b>To:</b> RE-wrenches
<a class="moz-txt-link-rfc2396E" href="mailto:re-wrenches@lists.re-wrenches.org"><re-wrenches@lists.re-wrenches.org></a><br>
<b>Subject:</b> Re: [RE-wrenches] Rapid Shutdown for
Off-grid systems</font>
<div> </div>
</div>
<div dir="auto">What about the PV circuits that leave the
combiner and are ran on or in a building to the CC
<div><br>
</div>
<div><br>
<br>
<div dir="ltr">Jeremy Rodriguez
<div>Solar Installation / <span
style="font-size:13pt">Design Expert </span></div>
<div>
<div>All Solar, Inc.
<div>1453 M St<br>
<div>Penrose Colorado 81240</div>
<div><br>
</div>
<div>Sent by Jeremy's iPhone. Sorry for typos
and shorthand. </div>
</div>
</div>
</div>
</div>
<div dir="ltr"><br>
<blockquote type="cite">On Feb 1, 2022, at 4:07 PM,
Brian Mehalic <a class="moz-txt-link-rfc2396E" href="mailto:brian@solarenergy.org"><brian@solarenergy.org></a> wrote:<br>
<br>
</blockquote>
</div>
<blockquote type="cite">
<div dir="ltr">\ufeff For a ground mount PV system with a
DC combiner, the PV source circuits are not in or
on a building so RS doesn\u2019t apply to them. And the
definition of a charge controller in Art. 100 is
in its relationship to batteries/storage, not
really the charging source - fundamentally it\u2019s
there to protect the storage/batteries, so it\u2019s
best considered part of that system, not the PV
system (and over the last several cycles nearly
all references to charge control/lers have been
moved out of 690).
<div>
<div><br>
</div>
<div><br>
<div><br>
</div>
<div><br>
<br>
<div dir="ltr">Brian</div>
<div dir="ltr"><br>
<blockquote type="cite">On Feb 1, 2022, at
3:15 PM, Bradley Bassett
<a class="moz-txt-link-rfc2396E" href="mailto:bbassett2@gmail.com"><bbassett2@gmail.com></a> wrote:<br>
<br>
</blockquote>
</div>
<blockquote type="cite">
<div dir="ltr">\ufeff
<div dir="ltr">
<div>"A switch, outside of the
building, <span
style="color:rgb(0,0,0)">opening
the PV circuit to the power
electronics, and </span>functioning
as the pv system disco and the rapid
shutdown initiation device, should
be all that is required."</div>
<div><br>
</div>
That is what I have found most
inspectors will accept, but not all. A
strict reading of the code does come
to the same conclusion that William
comes to, and some inspectors will
require that. The code is not very
specific on where the PV system
disconnect should go. It seems to be
mostly accepted to be on the PV side
of the charge control, but when I read
the code strictly it seems to me it
should be on the battery side of the
charge control since it is only a PV
device. Fortunately the PV side is
more accepted because that makes
things much easier.
<div><br>
</div>
<div>What I'm still having trouble
with is the requirement for
breaking both pos and neg legs in
the PV system disconnect unless
solidly grounded which most systems
are not (690.13(E)). I see that most
installers do not break both poles,
but only the positive leg, which is
of course easier and less expensive.
I've quoted the use of dual pole
breakers when possible, but OutBack
does not really call for that
always, and if you ask about their 2
pole 300V breakers they (and
Carling) don't say they can be used
that way. And if you do, you have to
run the wires in opposite directions
for polarity. I've asked for
clarification but have not
received it yet. Then there are the
high voltage charge controls like
Schneider, where often one uses the
SqD HU361, which can be wired in
various ways to meet the 600V
requirement. It can be wired one
pole for up to 18A Isc for PV, or up
to 30A if two poles in series, or
one pos and one neg pole in the
circuit. The Schneider RS Disco does
break both poles, one of the few
devices that make it clear. I'm
curious what others are doing.</div>
<div><br>
</div>
<div>Brad</div>
</div>
<br>
<div class="x_gmail_quote">
<div dir="ltr" class="x_gmail_attr">On
Tue, Feb 1, 2022 at 11:23 AM Brian
Mehalic <<a
href="mailto:brian@solarenergy.org"
moz-do-not-send="true"
class="moz-txt-link-freetext">brian@solarenergy.org</a>>
wrote:<br>
</div>
<blockquote class="x_gmail_quote"
style="margin:0px 0px 0px 0.8ex;
border-left:1px solid
rgb(204,204,204); padding-left:1ex">
<div dir="auto">Sorry, forgot to
state my previous comment was in
regards to a ground-mount. <br>
<br>
<div dir="ltr">Brian</div>
<div dir="ltr"><br>
<blockquote type="cite">On Feb
1, 2022, at 12:19 PM, William
Miller <<a
href="mailto:william@millersolar.com"
target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">william@millersolar.com</a>>
wrote:<br>
<br>
</blockquote>
</div>
<blockquote type="cite">
<div dir="ltr">\ufeff
<div>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif"; color:rgb(0,51,0)">Ray:</span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif"; color:rgb(0,51,0)"> </span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif"; color:rgb(0,51,0)">Thanks
for that input. I was
hoping I was wrong. I
looked for that
discussion in the
archives but could not
find it.</span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif"; color:rgb(0,51,0)"> </span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif"; color:rgb(0,51,0)">William</span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif"; color:rgb(0,51,0)"> </span></p>
<div>
<p class="x_MsoNormal"><span
style="font-family:Arial,"sans-serif"; color:rgb(0,51,0)">Miller
Solar</span></p>
<p class="x_MsoNormal"><span
style="font-family:Arial,"sans-serif"; color:rgb(0,51,0)">17395
Oak Road, Atascadero,
CA 93422</span></p>
<p class="x_MsoNormal"><span
style="font-family:Arial,"sans-serif"; color:rgb(0,51,0)">805-438-5600</span></p>
<p class="x_MsoNormal"><span
style="font-family:Arial,"sans-serif"; color:rgb(0,51,0)"><a
href="http://www.millersolar.com/"
target="_blank"
moz-do-not-send="true">www.millersolar.com</a></span></p>
<p class="x_MsoNormal"><span
style="font-family:Arial,"sans-serif"; color:rgb(0,51,0)">CA
Lic. 773985</span></p>
<p class="x_MsoNormal"><span
style="font-size:11pt;
font-family:Calibri,"sans-serif"; color:rgb(0,51,0)"> </span></p>
</div>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif"; color:rgb(0,51,0)"> </span></p>
<div>
<div
style="border-right:none;
border-bottom:none;
border-left:none;
border-top:1pt solid
rgb(181,196,223);
padding:3pt 0in 0in">
<p class="x_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 [mailto:<a
href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">re-wrenches-bounces@lists.re-wrenches.org</a>]
<b>On Behalf Of </b>Ray<br>
<b>Sent:</b>
Tuesday, February 1,
2022 10:11 AM<br>
<b>To:</b> <a
href="mailto:re-wrenches@lists.re-wrenches.org"
target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">re-wrenches@lists.re-wrenches.org</a><br>
<b>Subject:</b> Re:
[RE-wrenches] Rapid
Shutdown for
Off-grid systems</span></p>
</div>
</div>
<p class="x_MsoNormal"> </p>
<p> Ground mounts do NOT
require RSS. We hashed
this out years ago on the
Wrenches list, when NEC
2017 came out.</p>
<p>See Figure 690.1(B) Note
(2): <i>" The PV system
disconnect in these
diagrams separates the
PV system from all other
systems".</i></p>
<p>Thus, the PV disconnect
is defined as the
transition point from the
PV system to all other
systems, like battery or
inverter systems. The
installer/ designer
decides where to put that
disconnect. I usually put
it on the wall before it
goes into the building,
and I have never had an
inspector question that. </p>
<p>Thanks,</p>
<pre>Ray Walters</pre>
<pre>Remote Solar</pre>
<pre>303 505-8760</pre>
<div>
<p class="x_MsoNormal">On
2/1/22 10:06 AM, William
Miller wrote:</p>
</div>
<blockquote
style="margin-top:5pt;
margin-bottom:5pt">
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)">Jay:</span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)"> </span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)">Here
is the text from 2017:</span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)"> </span></p>
<p class="x_MsoNormal"><i><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)">690.12
Rapid Shutdown of PV
Systems on
Buildings. PV</span></i></p>
<p class="x_MsoNormal"><i><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)">system
circuits installed
on or in buildings
shall include a
rapid</span></i></p>
<p class="x_MsoNormal"><i><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)">shutdown
function to reduce
shock hazard for
emergency</span></i></p>
<p class="x_MsoNormal"><i><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)">responders
in accordance with
690.12(A) through
(D).</span></i></p>
<p class="x_MsoNormal"><i><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)"> </span></i></p>
<p class="x_MsoNormal"><i><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)">Exception:
Ground mounted PV
system circuits that
enter buildings, of</span></i></p>
<p class="x_MsoNormal"><i><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)">which
the sole purpose is
to house PV system
equipment, shall not
be</span></i></p>
<p class="x_MsoNormal"><i><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)">required
to comply with
690.12.</span></i></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)"> </span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)">The
wording is
interesting. The
requirement is
directed at \u201cPV system
circuits\u2026\u201d, not PV
arrays. The passage
does not specify where
the PV feeding those
circuits is located,
it just addresses
where the circuits
are, specifically \u201cin
or on a building.\u201d</span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)"> </span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)">The
only circuits that are
exempt are those
feeding a building
that serves only one
purpose, to house PV
equipment. For
circuits that enter
building with other
uses\u2014homes, garages,
barns, workshops,
etc.-- it would seem
there is a requirement
to have rapid shutdown
systems (RSS).</span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)"> </span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)">Reading
through the rest of
the section, I don\u2019t
see any language that
gets us out of the
requirement to reduce
voltages to less than
80 volts within 30
seconds inside the
array boundary, as in
module level shutdown,
regardless of roof-top
or ground-mount.
Although the 2020 code
includes some
differing language, I
don\u2019t see it as
exempting ground mount
systems.</span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)"> </span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)">The
moral of the story is
this: For
ground-mounts: either
install RSS or put
your equipment
(inverters, charge
controllers,
batteries, BOS) in a
separate building
housing only that
equipment.</span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)"> </span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)">I
don\u2019t necessarily like
the requirement, but I
think it exists. Jay,
or anyone, please,
please tell me I am
reading this
incorrectly.
</span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)"> </span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)">By
the way, regarding
battery circuits, here
is a quote from a post
by Bill Brooks on
March 16, 2016:</span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)"> </span></p>
<p class="x_MsoNormal"><i><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)">In
the 2017 NEC, we
were very careful to
carve out all
batteries and loads,</span></i></p>
<p class="x_MsoNormal"><i><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)">that
were previously part
of PV systems, and
place them in their
own</span></i></p>
<p class="x_MsoNormal"><i><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)">articles.</span></i></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)"> </span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)">I
have not read through
the battery sections
of the code to verify
this, I am taking Bill
at his word.</span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)"> </span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)">William
Miller</span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)"> </span></p>
<div>
<p class="x_MsoNormal"><span
style="font-family:Arial,"sans-serif"; color:rgb(153,51,102)">Miller
Solar</span></p>
<p class="x_MsoNormal"><span
style="font-family:Arial,"sans-serif"; color:rgb(153,51,102)">17395
Oak Road,
Atascadero, CA 93422</span></p>
<p class="x_MsoNormal"><span
style="font-family:Arial,"sans-serif"; color:rgb(153,51,102)">805-438-5600</span></p>
<p class="x_MsoNormal"><span
style="font-family:Arial,"sans-serif"; color:rgb(153,51,102)"><a
href="http://www.millersolar.com/" target="_blank"
moz-do-not-send="true">www.millersolar.com</a></span></p>
<p class="x_MsoNormal"><span
style="font-family:Arial,"sans-serif"; color:rgb(153,51,102)">CA
Lic. 773985</span></p>
<p class="x_MsoNormal"><span
style="font-size:11pt; font-family:Calibri,"sans-serif";
color:rgb(153,51,102)"> </span></p>
</div>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif";
color:rgb(153,51,102)"> </span></p>
<div>
<div
style="border-right:none;
border-bottom:none;
border-left:none;
border-top:1pt solid
rgb(181,196,223);
padding:3pt 0in 0in">
<p class="x_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""> Jay
[mailto:<a
href="mailto:jay.peltz@gmail.com"
target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">jay.peltz@gmail.com</a>]
<br>
<b>Sent:</b>
Tuesday, February
1, 2022 6:07 AM<br>
<b>To:</b> <a
href="mailto:william@millersolar.com"
target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">william@millersolar.com</a>;
RE-wrenches<br>
<b>Subject:</b>
Re: [RE-wrenches]
Rapid Shutdown for
Off-grid systems</span></p>
</div>
</div>
<p class="x_MsoNormal"> </p>
<div>
<p class="x_MsoNormal">2017
code has a specific
exception/clarification
for ground mount solar
that it does not need
RS. </p>
</div>
<div>
<p class="x_MsoNormal">It\u2019s
in the first line
after 690.12</p>
</div>
<div>
<p class="x_MsoNormal"> </p>
</div>
<div>
<p class="x_MsoNormal">Jay</p>
</div>
<div>
<p class="x_MsoNormal"
style="margin-bottom:12pt"> </p>
<p class="x_MsoNormal"
style="margin-bottom:12pt">On
Feb 1, 2022, at 12:13
AM, William Miller
<<a
href="mailto:william@millersolar.com"
target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">william@millersolar.com</a>> wrote:</p>
</div>
<blockquote
style="margin-top:5pt;
margin-bottom:5pt">
<div>
<p class="x_MsoNormal"><span
style="font-family:Tahoma,"sans-serif"">\ufeff</span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif"; color:rgb(31,73,125)">Jerry:</span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif"; color:rgb(31,73,125)"> </span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif"; color:rgb(31,73,125)">Yes
it is required.
Rapid Shutdown:
NEC 690.12. All
buildings except
dedicated solar
buildings. Read
it and weep.</span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif"; color:rgb(31,73,125)"> </span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif"; color:rgb(31,73,125)">William</span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif"; color:rgb(31,73,125)"> </span></p>
<p class="x_MsoNormal"><span
style="font-family:Arial,"sans-serif"; color:rgb(31,73,125)">Miller
Solar</span></p>
<p class="x_MsoNormal"><span
style="font-family:Arial,"sans-serif"; color:rgb(31,73,125)">17395
Oak Road,
Atascadero, CA
93422</span></p>
<p class="x_MsoNormal"><span
style="font-family:Arial,"sans-serif"; color:rgb(31,73,125)">805-438-5600</span></p>
<p class="x_MsoNormal"><span
style="font-family:Arial,"sans-serif"; color:rgb(31,73,125)"><a
href="http://www.millersolar.com/" target="_blank"
moz-do-not-send="true">www.millersolar.com</a></span></p>
<p class="x_MsoNormal"><span
style="font-family:Arial,"sans-serif"; color:rgb(31,73,125)">CA
Lic. 773985</span></p>
<p class="x_MsoNormal"><span
style="font-size:11pt; font-family:Calibri,"sans-serif";
color:rgb(31,73,125)"> </span></p>
<p class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif"; color:rgb(31,73,125)"> </span></p>
<p class="x_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""> Jerry
Shafer [mailto:<a
href="mailto:jerrysgarage01@gmail.com" target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">jerrysgarage01@gmail.com</a>]
<br>
<b>Sent:</b>
Monday, January
31, 2022 7:21 PM<br>
<b>To:</b> William
Miller;
RE-wrenches<br>
<b>Subject:</b>
Re: [RE-wrenches]
Rapid Shutdown for
Off-grid systems</span></p>
<p class="x_MsoNormal"> </p>
<div>
<p
class="x_MsoNormal">William</p>
<div>
<p
class="x_MsoNormal">Are
you sure RSD is
required on a
non habitable
building,
historically its
not required.
Now that being
said we use fire
raptor with the
best results,
yes it takes an
extra conduite
and might
require a button
and power supply
depending on
inverter
application.</p>
</div>
<div>
<p
class="x_MsoNormal">Jerry</p>
</div>
</div>
<p class="x_MsoNormal"> </p>
<div>
<div>
<p
class="x_MsoNormal">On
Mon, Jan 31,
2022, 9:57 AM
William Miller
<<a
href="mailto:william@millersolar.com"
target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">william@millersolar.com</a>>
wrote:</p>
</div>
<blockquote
style="border-top:none;
border-right:none;
border-bottom:none; border-left:1pt solid rgb(204,204,204); padding:0in
0in 0in 6pt;
margin:5pt 0in 5pt
4.8pt">
<div>
<div>
<p
class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif"">Friends:</span></p>
<p
class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif""> </span></p>
<p
class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif"">It is quite rare for
us to install
off-grid
systems on
roof-tops. We
have one
coming up with
about 20kW on
a large barn
roof. This
will be our
first off-grid
with a
module-level
rapid shutdown
requirement.
I see no
exemptions
from RSS for
off-grid
systems in the
code. I have
looked at the
options and
this is what I
have found:</span></p>
<p
class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif""> </span></p>
<p><span
style="font-family:Verdana,"sans-serif"">1.</span><span
style="font-size:7pt">
</span><span
style="font-family:Verdana,"sans-serif"">Fire
Raptor</span></p>
<p><span
style="font-family:Verdana,"sans-serif"">2.</span><span
style="font-size:7pt">
</span><span
style="font-family:Verdana,"sans-serif"">Tigo
TS4-F</span></p>
<p><span
style="font-family:Verdana,"sans-serif"">3.</span><span
style="font-size:7pt">
</span><span
style="font-family:Verdana,"sans-serif"">AC
coupling with
micro-inverters or optimizers</span></p>
<p
class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif""> </span></p>
<p
class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif"">No one of these
approaches
seems ideal.
The fire
raptor
requires extra
wiring for
control
leads. The
Tigo requires
a wireless
control system
which worries
me about
reliability.
With AC
Coupling
systems
floating the
proposed AGM
batteries may
be awkward.
Furthermore,
with AC
coupled
systems one
cannot charge
batteries
unless the
mini-grid is
operational, a
big problem.</span></p>
<p
class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif""> </span></p>
<p
class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif"">Have any of you
implemented
module-level
RSS on a
battery-based
inverter
system? I
looked in the
archives and
found no
threads that
apply. Thank
in advance.</span></p>
<p
class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif""> </span></p>
<p
class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif"">William Miller</span></p>
<p
class="x_MsoNormal"><span
style="font-family:Verdana,"sans-serif""> </span></p>
<p
class="x_MsoNormal"> </p>
</div>
</div>
<p
class="x_MsoNormal"> </p>
</blockquote>
</div>
</div>
</blockquote>
</blockquote>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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