<div dir="ltr">Hi William,<div><br></div><div>Keep in mind that the bigger Midnite remote trip breakers aren't UL listed last I checked. <div><br></div><div>Let us know what you come up with. <br><div><br></div><div><br></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jan 27, 2023 at 2:39 PM Bradley Bassett 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 dir="ltr"><div>Wiliam,</div><div><br></div><div>I designed a system for this using the MidNite RT breakers. They use 24VDC to trigger them, but you must then open the 24VDC to them once they have tripped or it will burn out the coil in the breaker. What I designed was a 48VDC to 24VDC power supply and a EPO button that is normally open. We have both of these, the N.O. button is rare. The power supply is from OutBack. Then once the breaker has tripped the power is no longer supplied to the switch or RT breaker. It does require a manual reset of the breaker. I've attached a drawing of this. <br></div><div><br></div><div></div><div>Brad</div><div>AEE Solar<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jan 27, 2023 at 12:54 PM William Miller via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">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><div lang="EN-US"><div><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 style="background:white"><span><span style="color:rgb(36,36,36);background:white">4.</span></span><span><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 style="background:white"><span><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 style="background:white"><span><span style="color:rgb(36,36,36);background:white">5.</span></span><span><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 style="background:white"><span><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-color:rgb(181,196,223) currentcolor currentcolor;border-style:solid none none;border-width:1pt medium medium;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_7624915389024929545m_2093875009230391585LGEmailHeader"><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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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div><br></div><div><font color="#305A78" face="'times new roman', serif"><br></font></div><div><br></div>Mac Lewis<br><br><span style="font-family:"Times New Roman";font-size:medium;color:rgb(255,153,0)"><b><font face="Arial, Helvetica, sans-serif" size="3"><p align="left"><font color="#000000" face="Verdana, Arial, Helvetica, sans-serif"><span style="font-size:small"><span style="font-family:arial;font-weight:normal;color:rgb(48,90,120)"><font face="'times new roman', serif">"Yo solo sé que no sé nada." </font><span style="font-weight:700;color:rgb(104,104,104)"><font face="'times new roman', serif">-Sócrates</font></span></span></span></font></p></font></b></span></div>