<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr">2017 code has a specific exception/clarification for ground mount solar that it does not need RS. </div><div dir="ltr">It\u2019s in the first line after 690.12</div><div dir="ltr"><br></div><div dir="ltr">Jay</div><div dir="ltr"><br><blockquote type="cite">On Feb 1, 2022, at 12:13 AM, William Miller <william@millersolar.com> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">\ufeff<meta http-equiv="Content-Type" content="text/html; charset=utf-8"><meta name="Generator" content="Microsoft Word 14 (filtered medium)"><style><!--
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--></style><div class="WordSection1"><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Jerry:</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">Yes it is required. Rapid Shutdown: NEC 690.12. All buildings except dedicated solar buildings. Read it and weep.</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><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><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><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""> Jerry Shafer [mailto:<a href="mailto:jerrysgarage01@gmail.com">jerrysgarage01@gmail.com</a>] <br><b>Sent:</b> Monday, January 31, 2022 7:21 PM<br><b>To:</b> William Miller; RE-wrenches<br><b>Subject:</b> Re: [RE-wrenches] Rapid Shutdown for Off-grid systems</span></p><p class="MsoNormal"> </p><div><p class="MsoNormal">William</p><div><p class="MsoNormal">Are you sure RSD is required on a non habitable building, historically its not required. Now that being said we use fire raptor with the best results, yes it takes an extra conduite and might require a button and power supply depending on inverter application.</p></div><div><p class="MsoNormal">Jerry</p></div></div><p class="MsoNormal"> </p><div><div><p class="MsoNormal">On Mon, Jan 31, 2022, 9:57 AM William Miller <<a href="mailto:william@millersolar.com">william@millersolar.com</a>> wrote:</p></div><blockquote style="border:none;border-left:solid #cccccc 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in"><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"">It is quite rare for us to install off-grid systems on roof-tops. We have one coming up with about 20kW on a large barn roof. This will be our first off-grid with a module-level rapid shutdown requirement. I see no exemptions from RSS for off-grid systems in the code. I have looked at the options and this is what I have found:</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="m8583279663636586131msolistparagraph"><span style="font-family:"Verdana","sans-serif"">1.</span><span style="font-size:7.0pt"> </span><span style="font-family:"Verdana","sans-serif"">Fire Raptor</span></p><p class="m8583279663636586131msolistparagraph"><span style="font-family:"Verdana","sans-serif"">2.</span><span style="font-size:7.0pt"> </span><span style="font-family:"Verdana","sans-serif"">Tigo TS4-F</span></p><p class="m8583279663636586131msolistparagraph"><span style="font-family:"Verdana","sans-serif"">3.</span><span style="font-size:7.0pt"> </span><span style="font-family:"Verdana","sans-serif"">AC coupling with micro-inverters or optimizers</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"">No one of these approaches seems ideal. The fire raptor requires extra wiring for control leads. The Tigo requires a wireless control system which worries me about reliability. With AC Coupling systems floating the proposed AGM batteries may be awkward. Furthermore, with AC coupled systems one cannot charge batteries unless the mini-grid is operational, a big problem.</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"">Have any of you implemented module-level RSS on a battery-based inverter system? I looked in the archives and found no threads that apply. Thank in advance.</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 Miller</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"">805-438-5600</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/" target="_blank">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><p class="MsoNormal" style="margin-bottom:12.0pt">_______________________________________________<br>List sponsored by Redwood Alliance<br><br>Pay optional member dues here: <a href="http://re-wrenches.org" target="_blank">http://re-wrenches.org</a><br><br>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches@lists.re-wrenches.org</a><br><br>Change listserver email address & settings:<br><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br><br>There are two list archives for searching. 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