<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><meta name="Generator" content="Microsoft Word 14 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
@font-face
{font-family:Verdana;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-reply;
font-family:"Verdana","sans-serif";
color:#1F497D;}
p.xmsolistparagraph, li.xmsolistparagraph, div.xmsolistparagraph
{mso-style-name:x_msolistparagraph;
margin-top:0in;
margin-right:0in;
margin-bottom:0in;
margin-left:.5in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
span.contentpasted0
{mso-style-name:contentpasted0;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style></head><body lang="EN-US" link="blue" vlink="purple"><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/"><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">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">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/">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></body></html>