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<p style="color:rgb(0, 0, 0);font-weight:400"><span style="color:rgb(0, 0, 255)"><strong class="ContentPasted1">2020 Code Language:</strong></span></p>
<p style="color:rgb(0, 0, 0);font-weight:400"><strong><em class="ContentPasted1">480.7 DC Disconnect Methods.</em></strong></p>
<p style="color:rgb(0, 0, 0);font-weight:400"><strong><em class="ContentPasted1">(A) Disconnecting Means.<span class="ContentPasted1"> </span></em></strong><em class="ContentPasted1">A disconnecting means shall be provided for all ungrounded conductors derived
from a stationary battery system with a voltage over 60 volts dc. A disconnecting means shall be readily accessible and located within sight of the battery system.</em></p>
<p style="color:rgb(0, 0, 0);font-weight:400"><span style="background-color:rgb(204, 204, 204)"><strong><em class="ContentPasted1">N</em></strong></span><strong><em class="ContentPasted1"><span class="ContentPasted1"> </span>(B) Emergency Disconnect.<span class="ContentPasted1"> </span></em></strong><em class="ContentPasted1">For
one-family and two-family dwellings, a disconnecting means or its remote control for a stationary battery system shall be located at a readily accessible location outside the building for emergency use. The disconnect shall be labeled “EMERGENCY DISCONNECT”.</em></p>
<p style="color:rgb(0, 0, 0);font-weight:400"><strong><em class="ContentPasted1"><span style="background-color:rgb(204, 204, 204)" class="ContentPasted1">N</span><span class="ContentPasted1"> </span>(C) Disconnection of Series Battery Circuits.<span class="ContentPasted1"> </span></em></strong><em class="ContentPasted1">Battery
circuits exceeding 240 volts dc nominal between conductors or to ground and subject to field servicing shall have provisions to disconnect the series-connected strings into segments not exceeding 240 volts dc nominal for maintenance by qualified persons. Non-load-break
bolted or plug-in disconnects shall be permitted.</em></p>
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<br class="Apple-interchange-newline" style="">
<div id="AppleMailSignature" dir="ltr">Jeremy Rodriguez
<div>Solar Installation / Design</div>
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<div>All Solar, Inc.
<div>1453 M St. <br>
<div>Penrose Colorado 81240</div>
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<div>Sent by Jeremy's iPhone. Sorry for typos and shorthand. </div>
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<blockquote type="cite">On Jan 28, 2023, at 7:28 AM, Christopher Warfel via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:<br>
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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>
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<div class="moz-cite-prefix">On 1/27/2023 3:35 PM, William Miller via RE-wrenches wrote:<br>
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<span style="font-family:"Verdana","sans-serif"; color:#1f497d">Glenn:</span></p>
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<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>
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<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>
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<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>
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<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>
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<span class="contentpasted0"><span style="color:#c82613; background:white">Yes</span></span><span style="color:#242424; background:white"></span></p>
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<span style="font-family:"Verdana","sans-serif"; color:#1f497d"> </span></p>
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<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>
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<span style="font-family:"Verdana","sans-serif"; color:#1f497d"> </span></p>
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<span style="font-family:"Verdana","sans-serif"; color:#1f497d">William</span></p>
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<span style="font-family:"Arial","sans-serif"; color:#1f497d">Miller Solar</span></p>
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<span style="font-family:"Arial","sans-serif"; color:#1f497d">17395 Oak Road, Atascadero, CA 93422</span></p>
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<span style="font-family:"Arial","sans-serif"; color:#1f497d">805-438-5600</span></p>
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<span style="font-family:"Arial","sans-serif"; color:#1f497d"><a href="http://www.millersolar.com/" data-auth="NotApplicable"><span style="color:blue">www.millersolar.com</span></a></span></p>
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<span style="font-family:"Arial","sans-serif"; color:#1f497d">CA Lic. 773985</span></p>
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<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" data-auth="NotApplicable" 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>
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<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>
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<span style="font-size:10.0pt">Obviously there is a big difference here and it may be changing as the code evolves.</span></p>
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<span style="font-size:10.0pt">-Glenn</span></p>
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<span style="font-size:10.0pt">Sent from my 'smart'phone, so please excuse typos and spelling errors.</span></p>
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<span style="font-size:10.0pt">------ Original message------</span></p>
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<b><span style="font-size:10.0pt">From: </span></b><span style="font-size:10.0pt">William Miller via RE-wrenches</span></p>
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<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>
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<b><span style="font-size:10.0pt">To: </span></b><span style="font-size:10.0pt">RE-wrenches;</span></p>
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<b><span style="font-size:10.0pt">Cc: </span></b><span style="font-size:10.0pt">William Miller;</span></p>
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<b><span style="font-size:10.0pt">Subject:</span></b><span style="font-size:10.0pt">[RE-wrenches] Remote battery disconnects</span></p>
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<span style="font-family:"Verdana","sans-serif"">Friends:</span></p>
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<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>
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<span style="font-family:"Verdana","sans-serif""> </span></p>
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<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>
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<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>
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<span style="font-family:"Verdana","sans-serif""> </span></p>
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<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>
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<span style="font-family:"Verdana","sans-serif""> </span></p>
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<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>
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<span style="font-family:"Verdana","sans-serif""> </span></p>
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<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>
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<span style="font-family:"Verdana","sans-serif""> </span></p>
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<span style="font-family:"Verdana","sans-serif"">William</span></p>
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<span style="font-family:"Verdana","sans-serif""> </span></p>
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<span style="font-family:"Arial","sans-serif"">Miller Solar</span></p>
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<span style="font-family:"Arial","sans-serif"">17395 Oak Road, Atascadero, CA 93422</span></p>
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<span style="font-family:"Arial","sans-serif""><a href="tel:805-438-5600" data-auth="NotApplicable">805-438-5600</a></span></p>
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<span style="font-family:"Arial","sans-serif""><a href="http://www.millersolar.com/" data-auth="NotApplicable">www.millersolar.com</a></span></p>
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<span style="font-family:"Arial","sans-serif"">CA Lic. 773985</span></p>
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