<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr">Good point Glenn. </div><div dir="ltr">My question is if this system is in its own building. If so it is probably easier to convince the AHJ about not needing a remote battery disco. </div><div dir="ltr"><br></div><div dir="ltr">Jay</div><div dir="ltr"><br><blockquote type="cite">On Jan 27, 2023, at 12:46 PM, Glenn Burt via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
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<div style="font-size: 10pt;"><div dir="auto">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?</div><div dir="auto">Obviously there is a big difference here and it may be changing as the code evolves.</div><div dir="auto"><br></div><div><div dir="auto" font-size:9pt;"="">-Glenn</div><div dir="auto" font-size:9pt;"="">Sent from my 'smart'phone, so please excuse typos and spelling errors.</div></div></div><div style="font-size: 10pt;"><div id="LGEmailHeader" dir="auto"><div dir="auto"><br></div><div dir="auto">------ Original message------</div><div dir="auto"><b>From: </b>William Miller via RE-wrenches<re-wrenches@lists.re-wrenches.org></re-wrenches@lists.re-wrenches.org></div><div dir="auto"><b>Date: </b>Fri, Jan 27, 2023 2:26 PM</div><div dir="auto"><b>To: </b>RE-wrenches;</div><div dir="auto"><b>Cc: </b>William
Miller;</div><div dir="auto"><b>Subject:</b>[RE-wrenches] Remote battery disconnects</div><div dir="auto"><br></div></div><div dir="auto"><div class="WordSection1"><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">Friends:</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;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-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;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-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;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-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;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-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;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-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;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-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">William</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">Miller Solar</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">17395 Oak Road, Atascadero, CA 93422</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><a href="tel:805-438-5600">805-438-5600</a></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><a href="http://www.millersolar.com/">www.millersolar.com</a></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">CA Lic. 773985</span></p><p class="MsoNormal"> </p><p class="MsoNormal"> </p></div></div></div>
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