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<p><font size="4">Seems confusing that the AHJ is requiring a
disconnect for AC wiring, not specific to which or both panel
types, and then a dc disconnect with no code reference. Was
trying to convey a reasonable, safe approach. A lot of bad
information from fire department solar consultants making a lot
of money fear mongering, which has led to this type of
situation. Chris</font><br>
</p>
<div class="moz-cite-prefix">On 1/27/2023 3:35 PM, William Miller
via RE-wrenches wrote:<br>
</div>
<blockquote type="cite"
cite="mid:892a682bf31f311ae9e49c986852cbed@mail.gmail.com">
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d">Glenn:</span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d">As
I wrote, a DC disconnect is required. Here is an excerpt
from the Q&A with the building official:</span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<p class="xmsolistparagraph" style="background:white"><span
class="contentpasted0"><span
style="color:#242424;background:white">4.</span></span><span
class="contentpasted0"><span
style="font-size:7.0pt;color:#242424;background:white"> </span><span
style="color:#242424;background:white">Will you be
requiring an external disconnect to disconnect the AC
output of the inverter system from premise wiring?</span></span><span
style="color:#242424;background:white"></span></p>
<p class="xmsolistparagraph" style="background:white"><span
class="contentpasted0"><span
style="color:#c82613;background:white">Yes, as required
per 230.85</span></span><span
style="color:#242424;background:white"></span></p>
<p class="xmsolistparagraph" style="background:white"><span
class="contentpasted0"><span
style="color:#242424;background:white">5.</span></span><span
class="contentpasted0"><span
style="font-size:7.0pt;color:#242424;background:white"> </span><span
style="color:#242424;background:white">Will you be
requiring an external disconnect to disconnect batteries
from the inverters?</span></span><span
style="color:#242424;background:white"></span></p>
<p class="xmsolistparagraph" style="background:white"><span
class="contentpasted0"><span
style="color:#c82613;background:white">Yes</span></span><span
style="color:#242424;background:white"></span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d">If
the DC disconnect was not required I would not be wasting
everyone’s time with my post. I try to be careful about
that, researching on my own before posting and trying to
make my questions very clear. I also try not to embarrass
myself with dumb questions, but that does happen
occasionally…</span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d">William</span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<div>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1f497d">Miller
Solar</span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1f497d">17395
Oak Road, Atascadero, CA 93422</span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1f497d">805-438-5600</span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1f497d"><a
href="http://www.millersolar.com/"
moz-do-not-send="true"><span style="color:blue">www.millersolar.com</span></a></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1f497d">CA
Lic. 773985</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
</div>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </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 [mailto:<a
href="mailto:re-wrenches-bounces@lists.re-wrenches.org"
moz-do-not-send="true" class="moz-txt-link-freetext">re-wrenches-bounces@lists.re-wrenches.org</a>]
<b>On Behalf Of </b>Glenn Burt via RE-wrenches<br>
<b>Sent:</b> Friday, January 27, 2023 11:46 AM<br>
<b>To:</b> William Miller via RE-wrenches<br>
<b>Cc:</b> Glenn Burt<br>
<b>Subject:</b> Re: [RE-wrenches] Remote battery
disconnects</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt">Does the
AHJ really want the batteries disconnected from
conductors, or does he really just want the inverters to
stop operating and producing AC within the house?</span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt">Obviously
there is a big difference here and it may be changing as
the code evolves.</span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt"> </span></p>
</div>
<div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt">-Glenn</span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt">Sent
from my 'smart'phone, so please excuse typos and
spelling errors.</span></p>
</div>
</div>
</div>
<div>
<div id="LGEmailHeader">
<div>
<p class="MsoNormal"><span style="font-size:10.0pt"> </span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt">------
Original message------</span></p>
</div>
<div>
<p class="MsoNormal"><b><span style="font-size:10.0pt">From:
</span></b><span style="font-size:10.0pt">William
Miller via RE-wrenches</span></p>
</div>
<div>
<p class="MsoNormal"><b><span style="font-size:10.0pt">Date:
</span></b><span style="font-size:10.0pt">Fri, Jan 27,
2023 2:26 PM</span></p>
</div>
<div>
<p class="MsoNormal"><b><span style="font-size:10.0pt">To:
</span></b><span style="font-size:10.0pt">RE-wrenches;</span></p>
</div>
<div>
<p class="MsoNormal"><b><span style="font-size:10.0pt">Cc:
</span></b><span style="font-size:10.0pt">William
Miller;</span></p>
</div>
<div>
<p class="MsoNormal"><b><span style="font-size:10.0pt">Subject:</span></b><span
style="font-size:10.0pt">[RE-wrenches] Remote battery
disconnects</span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt"> </span></p>
</div>
</div>
<div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif"">Friends:</span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif"">We have a
large-ish residential off-grid system install coming
up. The AHJ has said they will require a remote
battery disconnect. I suspect there will be fire
sprinkler controls and a pressure pump that would
become inoperable if this system were engaged. In
this case we will apply for a waiver.</span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif"">The last
time this was discussed here as far as I can find was
October of 2020. At that time no one suggested any
specific battery disconnect equipment. </span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif"">To
further clarify my needs: There will be 4 or 5 Radian
8048 inverters (5 or 6 4/0 battery circuits, ~350A
each) and two 175 amp PV recombiner outputs. That is
6 poles of high amperage DC disconnects. </span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif"">The
battery array will be either a UnigyII VRLA or a
lithium of a brand yet to be determined. In the case
of lithium we will look for a system that can remotely
enable a BMS shutdown. In the case of a VRLA
lead-acid, we will not have that luxury.</span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif"">I have
done some considerable research and have not found
viable, high amperage, remotely activated shutdown
equipment.</span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif"">I am
wondering what hardware others may be using to achieve
remote battery disconnecting in these types of cases..</span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif"">William</span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Arial","sans-serif"">Miller
Solar</span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Arial","sans-serif"">17395 Oak
Road, Atascadero, CA 93422</span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Arial","sans-serif""><a
href="tel:805-438-5600" moz-do-not-send="true">805-438-5600</a></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Arial","sans-serif""><a
href="http://www.millersolar.com/"
moz-do-not-send="true">www.millersolar.com</a></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Arial","sans-serif"">CA Lic.
773985</span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> </p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> </p>
</div>
</div>
</div>
</div>
<br>
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