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<p>I had a similar issue a few years ago. An array would not show several of the micro inverters. Noise was detected by my phone with the Toolkit.</p>
<p>We added ferrite rings, which did not solve the problem. </p>
<p>Later, for no known reason, the problem went away. </p>
<p>Drake </p>
<p><br /></p>
<p><em>Drake Chamberlin</em></p>
<p><em>Athens Electric LLC</em></p>
<p><em>Ohio Electrical Contractor’s License 44810</em></p>
<p><em>NABCEP Certified PV Installation Professional</em></p>
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<p id="reply-intro">On 2025-09-02 23:28, William Miller via RE-wrenches wrote:</p>
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<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';">Friends:</span></p>
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<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';">I have a project where I installed 36 IQ7 inverters a few years ago and then another 12 on a different building about 2 years ago</span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';"> </span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';">On June 6 of this year a few of the 12 micro-inverters stopped producing. Over the course of the next 30 days the rest of the 12 stopped producing. When I checked on them the 12 were not communicating with the Envoy.</span></p>
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<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';">I went on site and found the power to the string had been on and off intermittently due to a bad relay we have in the circuit. I bypassed the relay and the micros would still not produce or communicate. </span></p>
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<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';">I called Enphase and they said there was noise on the power system that was causing the problem. I pondered this for a while and figured the micros should not stop producing if the communications went down. I called Enphase back twice and they could not offer a solution. I tried again today and the tech was able to determine there was a setting that when changed allowed communications. He also said there was a low DC resistance that indicates an arc fault. He was able to correct both issues and the 12 are now communicating and producing.</span></p>
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<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';">The problem is over so I don't want to put a lot of thought into this but my curiosity won't let me stop thinking about this issue. I feel compelled to write to the list because if anyone experiences this problem they might benefit from what I learned.</span></p>
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<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';">Have any of you experienced this?</span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';"> </span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';">William Miller</span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';"> </span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Arial','sans-serif';">Miller Solar</span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Arial','sans-serif';">17395 Oak Road, Atascadero, CA 93422</span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Arial','sans-serif';">805-438-5600</span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Arial','sans-serif';"><a href="http://www.millersolar.com/" target="_blank" rel="noopener noreferrer">www.millersolar.com</a></span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Arial','sans-serif';">CA Lic. 773985</span></p>
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