<div dir="ltr"><div>Here is a link to download the SolarPro May/June 2016 issue reference below: <a href="https://drive.google.com/file/d/1eiBt5n-ABfNn2ng8IwVl2yMvVHpQlZ_U/view?usp=sharing">https://drive.google.com/file/d/1eiBt5n-ABfNn2ng8IwVl2yMvVHpQlZ_U/view?usp=sharing</a></div><div><br></div><div>-August</div><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Apr 23, 2024 at 4:34 PM August Goers <<a href="mailto:august@luminalt.com">august@luminalt.com</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">Hi William and All -<div><br></div><div>The SolarPro Magazine article on page 35 "Updates for NEC 2017 PV Systems" by Bill Brooks is excellent and talks about "The replacement of legacy grounded inverters with new and improved transformerless inverters" on page 41.</div><div><br></div><div>This might be helpful for thinking through the implications of upgrading old transformer isolated inverter systems with modern transformerless non-isolated inverters.</div><div><br></div><div>Best, </div><div><br></div><div>August</div><div>Luminalt</div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr"><br></div><div dir="ltr"><div class="gmail_quote"><div dir="ltr" class="gmail_attr">---------- Forwarded message ---------<br>From: <strong class="gmail_sendername" dir="auto">August Goers</strong> <span dir="auto"><<a href="mailto:august@luminalt.com" target="_blank">august@luminalt.com</a>></span><br>Date: Thu, Sep 16, 2021 at 6:00 PM<br>Subject: Re: [RE-wrenches] Transformerless inverter conversion<br>To:  <<a href="mailto:william@millersolar.com" target="_blank">william@millersolar.com</a>><br></div><br><br><div dir="auto">Here is the original magazine I downloaded from the Solar Pro Magazine archives.</div><div dir="auto"><br></div><div dir="auto">August</div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Sep 16, 2021 at 5:42 PM William Miller <<a href="mailto:william@millersolar.com" target="_blank">william@millersolar.com</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 lang="EN-US"><div><p class="MsoNormal"><span style="font-family:Verdana,"sans-serif";color:rgb(31,73,125)">August:</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)">I can’t seem to view the diagrams.  Do you have access to a version with those available?</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)">Thanks,</span></p></div></div><div lang="EN-US"><div><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><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)"><a href="https://www.google.com/maps/search/17395+Oak+Road,+Atascadero,+CA+93422?entry=gmail&source=g" target="_blank">17395 Oak Road, Atascadero, CA 93422</a></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><p class="MsoNormal"><span style="font-family:Verdana,"sans-serif";color:rgb(31,73,125)"> </span></p><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""> August Goers [mailto:<a href="mailto:august@luminalt.com" target="_blank">august@luminalt.com</a>] <br><b>Sent:</b> Thursday, September 16, 2021 3:47 PM<br><b>To:</b> William Miller<br><b>Subject:</b> Re: [RE-wrenches] Transformerless inverter conversion</span></p><p class="MsoNormal"> </p><div><p class="MsoNormal">You bet!<br clear="all"></p><div><div><div><div><div><div><div><p><b><span style="font-size:9pt;font-family:"Century Gothic","sans-serif"">August Goers</span></b></p><p><span style="font-size:9pt;font-family:"Century Gothic","sans-serif"">Principal</span></p><p><span style="font-size:8pt;font-family:"Century Gothic","sans-serif"">Luminalt Energy Corporation</span></p><p><span style="font-size:8pt;font-family:"Century Gothic","sans-serif"">o: 415.792.6666</span></p><p><span style="font-size:8pt;font-family:"Century Gothic","sans-serif"">m: 415.559.1525</span></p><p><span style="font-size:8pt;font-family:"Century Gothic","sans-serif""><a href="http://www.luminalt.com" target="_blank">www.luminalt.com</a></span></p><p> </p></div></div></div></div></div></div></div><p class="MsoNormal"> </p></div><p class="MsoNormal"> </p><div><div><p class="MsoNormal">On Thu, Sep 16, 2021 at 2:24 PM William Miller <<a href="mailto:william@millersolar.com" target="_blank">william@millersolar.com</a>> wrote:</p></div><blockquote style="border-top:none;border-right:none;border-bottom:none;border-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4.8pt;margin-right:0in"><div><p class="MsoNormal">August:</p><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">Perfect. Thank you!</p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal" style="margin-bottom:12pt">I hope I formatted this reply to avoid being moderated. </p><div><p class="MsoNormal">William Miller</p><div><div><p class="MsoNormal"><a href="http://www.millersolar.com" target="_blank">www.millersolar.com</a></p></div></div></div><div><p class="MsoNormal"><br><br></p><p class="MsoNormal" style="margin-bottom:12pt">On Sep 16, 2021, at 11:58 AM, August Goers <<a href="mailto:august@luminalt.com" target="_blank">august@luminalt.com</a>> wrote:</p></div><blockquote style="margin-top:5pt;margin-bottom:5pt"><div><p class="MsoNormal"><span style="font-family:Tahoma,"sans-serif""></span></p><div><p class="MsoNormal">Hi William - I think this article by Bill Brooks directly answers both of your questions:</p><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal"><a href="https://www.southportland.org/files/8814/8156/0204/NEC_2017_Updates_for_PV_Systems___SolarPro_Magazine.pdf" target="_blank">https://www.southportland.org/files/8814/8156/0204/NEC_2017_Updates_for_PV_Systems___SolarPro_Magazine.pdf</a></p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal" style="margin-bottom:12pt">-August</p></div></div><p class="MsoNormal"> </p><div><div><p class="MsoNormal">On Thu, Sep 16, 2021 at 9:19 AM William Miller <<a href="mailto:william@millersolar.com" target="_blank">william@millersolar.com</a>> wrote:</p></div><blockquote style="border-top:none;border-right:none;border-bottom:none;border-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4.8pt;margin-right:0in"><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"">Thanks to all of you for your valuable input on the repowering project I am researching.  I am learning a lot in the process and generating more questions as I proceed.  Here is are questions that came up, and if any of you have insight, I would love to hear it:</span></p><p class="MsoNormal"><span style="font-family:Verdana,"sans-serif""> </span></p><p style="margin-left:0.75in"><span style="font-family:Verdana,"sans-serif"">1.</span><span style="font-size:7pt">   </span><span style="font-family:Verdana,"sans-serif"">Array OCPD/disconnecting.  The existing array has fuses in the positive leads only.  If we were to upgrade to transformerless inverters, will we be required to install OCPD in the negative leads as well?  (In researching this I came upon this entry in 2017 NEC 690.9: <i>Informational Note: Due to improved ground-fault protection required in PV systems by 690.41(B), a single overcurrent protective device in either the positive or negative conductors of a PV system in combination with this ground-fault protection provides adequate overcurrent protection.</i>)</span></p><p style="margin-left:0.75in"><i><span style="font-family:Verdana,"sans-serif"">2.</span></i><i><span style="font-size:7pt">   </span></i><span style="font-family:Verdana,"sans-serif"">In the 2014 NEC when installing Ungrounded PV systems, the following requirement appeared in 690.35:  <i>Conductors listed and identified as PV wire installed as exposed, single conductors…</i>  What happened to 690.35, and can I now use USE-2 on transformerless inverter installations?</span></p><p class="MsoNormal"><span style="font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><span style="font-family:Verdana,"sans-serif"">Thanks in advance.</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 Miller</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""><a href="https://www.google.com/maps/search/17395+Oak+Road,+Atascadero,+CA+93422?entry=gmail&source=g" target="_blank">17395 Oak Road, Atascadero, CA 93422</a></span></p><p class="MsoNormal"><span style="font-family:Arial,"sans-serif"">805-438-5600</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><p class="MsoNormal" style="margin-bottom:12pt">_______________________________________________<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. When one doesn't work, try the other:<br><a href="https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/" target="_blank">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a><br><a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" target="_blank">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br><br>List rules & etiquette:<br><a href="http://www.re-wrenches.org/etiquette.htm" target="_blank">http://www.re-wrenches.org/etiquette.htm</a><br><br>Check out or update participant bios:<br><a href="http://www.members.re-wrenches.org" target="_blank">http://www.members.re-wrenches.org</a></p></blockquote></div></div></blockquote></div></div></blockquote></div></div></div>
</blockquote></div></div>-- <br><div dir="ltr">August Goers<br>Luminalt<br>o: 415.792.6666<br>m: 415.559.1525<br><a href="mailto:august@luminalt.com" target="_blank">august@luminalt.com</a></div>
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