<div dir="ltr">Hi William,<div><br></div><div>I don't want to hijack this thread but I want to give you another idea for disconnecting the Enphase circuit.</div><div><br></div><div>Generac makes a very convenient load shed device called Smart Management Module SMM50. This may be a good option for you. Instead of having a signal wire/trench etc, it is a pass through relay with a board that samples the line voltage. If it senses that the voltage is supplied by a generator, you can program it to lock out the load. You could place it on the interconnection of the enphase circuit. They only guarantee it will work with a Generac generator, but I suspect it will work with other brands as well. This could be worth considering.</div><div><br></div><div>Good luck!</div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jun 20, 2024 at 12:35 AM William Miller 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 class="msg-5659409695834214212"><div lang="EN-US"><div class="m_-5659409695834214212WordSection1"><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif"">Friends:</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif"">I have an installation of 12 Enphase IQ inverters that is downstream from a generator transfer switch. During power outages the generator will run poorly when the Enphase is on and the sun is shining. The problems go away when the Enphase is shut off. No surprises about this.</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif"">The Enphase is installed on a barn about 150 conduit feet from the generator transfer switch. My plan is to create a low voltage signal when the generator is running and send it to a coil on a contactor in the barn. Said contactor will disconnect the 12 micro-inverters.</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif"">There is existing one 26 AWG pairs of a Cat 6 cable running between the buildings. I have found a two pole, 30A contactor that draws 7 watts on the coil. The voltage drop calcs on 150 feet of 26 AWG wire shows a 24 volt signal will not cause excessive voltage drop (~4%).</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif"">Here is where I am uncertain: Should I run 24 volts AC or DC? My concern about DC is if there are any damp connections, electrolysis will occur that might erode the 26 AWG conductors. We’ve all seen powder where copper used to be. Is AC less susceptible to electrolysis? My research has turned up no pertinent conclusions.</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif"">Thanks in advance.</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif"">William Miller</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Arial,"sans-serif"">Miller Solar</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Arial,"sans-serif"">17395 Oak Road, Atascadero, CA 93422</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Arial,"sans-serif"">805-438-5600</span></p><p class="MsoNormal"><span style="font-size:12pt;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-size:12pt;font-family:Arial,"sans-serif"">CA Lic. 773985</span></p><p class="MsoNormal"> </p><p class="MsoNormal"> </p></div></div>
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</div></blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><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>