<div dir="ltr">A dc-rated shunt trip breaker @ 250A (Blue Planet / OB Radian cabinet breaker) would do the trick if they exist. The trip device could be mounted outside.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jan 27, 2023 at 3:55 PM William Miller via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-8361974949273170129"><div lang="EN-US"><div class="m_-8361974949273170129WordSection1"><p class="MsoNormal"><span style="font-family:Verdana,"sans-serif";color:rgb(31,73,125)">Glenn:</span></p><p class="MsoNormal"><span style="font-family:Verdana,"sans-serif";color:rgb(31,73,125)"> </span></p><p class="MsoNormal"><span style="font-family:Verdana,"sans-serif";color:rgb(31,73,125)">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:rgb(31,73,125)"> </span></p><p class="m_-8361974949273170129xmsolistparagraph" style="background:white"><span class="m_-8361974949273170129contentpasted0"><span style="color:rgb(36,36,36);background:white">4.</span></span><span class="m_-8361974949273170129contentpasted0"><span style="font-size:7pt;color:rgb(36,36,36);background:white"> </span><span style="color:rgb(36,36,36);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:rgb(36,36,36);background:white"></span></p><p class="m_-8361974949273170129xmsolistparagraph" style="background:white"><span class="m_-8361974949273170129contentpasted0"><span style="color:rgb(200,38,19);background:white">Yes, as required per 230.85</span></span><span style="color:rgb(36,36,36);background:white"></span></p><p class="m_-8361974949273170129xmsolistparagraph" style="background:white"><span class="m_-8361974949273170129contentpasted0"><span style="color:rgb(36,36,36);background:white">5.</span></span><span class="m_-8361974949273170129contentpasted0"><span style="font-size:7pt;color:rgb(36,36,36);background:white"> </span><span style="color:rgb(36,36,36);background:white">Will you be requiring an external disconnect to disconnect batteries from the inverters?</span></span><span style="color:rgb(36,36,36);background:white"></span></p><p class="m_-8361974949273170129xmsolistparagraph" style="background:white"><span class="m_-8361974949273170129contentpasted0"><span style="color:rgb(200,38,19);background:white">Yes</span></span><span style="color:rgb(36,36,36);background:white"></span></p><p class="MsoNormal"><span style="font-family:Verdana,"sans-serif";color:rgb(31,73,125)"> </span></p><p class="MsoNormal"><span style="font-family:Verdana,"sans-serif";color:rgb(31,73,125)">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:rgb(31,73,125)"> </span></p><p class="MsoNormal"><span style="font-family:Verdana,"sans-serif";color:rgb(31,73,125)">William</span></p><p class="MsoNormal"><span style="font-family:Verdana,"sans-serif";color:rgb(31,73,125)"> </span></p><div><p class="MsoNormal"><span style="font-family:Arial,"sans-serif";color:rgb(31,73,125)">Miller Solar</span></p><p class="MsoNormal"><span style="font-family:Arial,"sans-serif";color:rgb(31,73,125)">17395 Oak Road, Atascadero, CA 93422</span></p><p class="MsoNormal"><span style="font-family:Arial,"sans-serif";color:rgb(31,73,125)">805-438-5600</span></p><p class="MsoNormal"><span style="font-family:Arial,"sans-serif";color:rgb(31,73,125)"><a href="http://www.millersolar.com/" target="_blank"><span style="color:blue">www.millersolar.com</span></a></span></p><p class="MsoNormal"><span style="font-family:Arial,"sans-serif";color:rgb(31,73,125)">CA Lic. 773985</span></p><p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,"sans-serif";color:rgb(31,73,125)"> </span></p></div><p class="MsoNormal"><span style="font-family:Verdana,"sans-serif";color:rgb(31,73,125)"> </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="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">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:10pt">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:10pt">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:10pt"> </span></p></div><div><div><p class="MsoNormal"><span style="font-size:10pt">-Glenn</span></p></div><div><p class="MsoNormal"><span style="font-size:10pt">Sent from my 'smart'phone, so please excuse typos and spelling errors.</span></p></div></div></div><div><div id="m_-8361974949273170129LGEmailHeader"><div><p class="MsoNormal"><span style="font-size:10pt"> </span></p></div><div><p class="MsoNormal"><span style="font-size:10pt">------ Original message------</span></p></div><div><p class="MsoNormal"><b><span style="font-size:10pt">From: </span></b><span style="font-size:10pt">William Miller via RE-wrenches</span></p></div><div><p class="MsoNormal"><b><span style="font-size:10pt">Date: </span></b><span style="font-size:10pt">Fri, Jan 27, 2023 2:26 PM</span></p></div><div><p class="MsoNormal"><b><span style="font-size:10pt">To: </span></b><span style="font-size:10pt">RE-wrenches;</span></p></div><div><p class="MsoNormal"><b><span style="font-size:10pt">Cc: </span></b><span style="font-size:10pt">William Miller;</span></p></div><div><p class="MsoNormal"><b><span style="font-size:10pt">Subject:</span></b><span style="font-size:10pt">[RE-wrenches] Remote battery disconnects</span></p></div><div><p class="MsoNormal"><span style="font-size:10pt"> </span></p></div></div><div><div><p class="MsoNormal"><span style="font-family:Verdana,"sans-serif"">Friends:</span></p><p class="MsoNormal"><span style="font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><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"><span style="font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><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"><span style="font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><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"><span style="font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><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"><span style="font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><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"><span style="font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><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"><span style="font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><span style="font-family:Verdana,"sans-serif"">William</span></p><p class="MsoNormal"><span style="font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><span style="font-family:Arial,"sans-serif"">Miller Solar</span></p><p class="MsoNormal"><span style="font-family:Arial,"sans-serif"">17395 Oak Road, Atascadero, CA 93422</span></p><p class="MsoNormal"><span style="font-family:Arial,"sans-serif""><a href="tel:805-438-5600" target="_blank">805-438-5600</a></span></p><p class="MsoNormal"><span style="font-family:Arial,"sans-serif""><a href="http://www.millersolar.com/" target="_blank">www.millersolar.com</a></span></p><p class="MsoNormal"><span style="font-family:Arial,"sans-serif"">CA Lic. 773985</span></p><p class="MsoNormal"> </p><p class="MsoNormal"> </p></div></div></div></div></div>
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</div></blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><p class="MsoNormal" style="color:rgb(0,0,0);font-family:Arial;font-size:16px;margin:0in 0in 0.0001pt"><span style="font-size:10pt"><a name="SignatureSanitizer__MailAutoSig"><b>Kirk Herander / </b></a><b><a href="mailto:kirkh@vermont.solar" title="Send an email to kirkh@vermont.solar; Send an email to kirkh@vermont.solar" style="color:blue" target="_blank">kirkh@vermont.solar</a></b></span></p><p class="MsoNormal" style="color:rgb(0,0,0);font-family:Arial;font-size:16px;margin:0in 0in 0.0001pt"><span style="font-size:10pt"><b>Owner|Principal, VT Solar, LLC</b></span></p><p class="MsoNormal" style="color:rgb(0,0,0);font-family:Arial;font-size:16px;margin:0in 0in 0.0001pt"><span style="font-size:10pt"><b><i>Celebrating our 32<sup>st</sup> Anniversary 1991-2023!!</i></b></span></p><p class="MsoNormal" style="color:rgb(0,0,0);font-family:Arial;font-size:16px;margin:0in 0in 0.0001pt"><span style="font-size:10pt">dba Vermont Solar Engineering</span><br></p><p class="MsoNormal" style="color:rgb(0,0,0);font-family:Arial;font-size:16px;margin:0in 0in 0.0001pt"><span style="font-size:10pt">802.863.1202</span></p></div></div>