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<div style="font-size: 10pt;"><div dir="auto">Could be moisture accumulation in the conduit over the years along with a minor insulation damage.</div><div dir="auto">I am tracing a similar intermittent on an Aurora roof mount. Incompatible MC connectors are my first pass at repair, however has also not corrected the issue.</div><div dir="auto">Only fails after rain.</div><div dir="auto">IRT testing did not reveal any clue, but it is hard to coordinate testing availability with weather conditions.</div><div dir="auto">Original installer long gone...</div><div dir="auto"><br></div><div><div dir="auto" font-size:9pt;"="">-Glenn</div><div dir="auto" font-size:9pt;"="">Sent from my 'smart'phone, so please excuse typos and spelling errors.</div></div></div><div style="font-size: 10pt;"><div id="LGEmailHeader" dir="auto"><div dir="auto"><br></div><div dir="auto">------ Original message------</div><div dir="auto"><b>From: </b>Dave Tedeyan via
RE-wrenches<re-wrenches@lists.re-wrenches.org></re-wrenches@lists.re-wrenches.org></div><div dir="auto"><b>Date: </b>Wed, Dec 13, 2023 10:52 AM</div><div dir="auto"><b>To: </b>RE-wrenches;</div><div dir="auto"><b>Cc: </b>Dave Tedeyan;</div><div dir="auto"><b>Subject:</b>[RE-wrenches] SMA TL-22 insulation resistance error</div><div dir="auto"><br></div></div><div dir="ltr">Hi All,<div><br><div>I am curious to hear if anyone else has run into this:</div><div><br></div><div>This is the system I posted about a little while ago that had the SolarWorld modules and all the module to module connectors were swollen and melted. One of the inverters was giving an insulation resistance error, and so after seeing the module connectors, I was sure that was the issue. We replaced every single module connector with new MC4's, and then the error came back!</div><div><br></div><div>My next step was to swap in the junction box which strings go to which inverter to identify whether the issue was on the
roof or somewhere between the roof jbox and the inverter. (the issue was isolated to only 1 of 4 strings previously). Turns out the same inverter is faulting, which leads me to believe that there may be an issue with the wires in the DC conduit. Maybe they got damaged by a rough wire pull at the initial installation 7 years ago, and its finally degraded enough to cause a problem. The fault is intermittent, only showing up once every couple weeks or so, so it is difficult to catch it while the fault is active. </div><div><br></div><div>But my question is, could there also be something wrong with the inverter itself? After spending a lot of time on this one, ideally, I would know that replacing the DC wires will fix it. So I am curious if people have done this, to still find that the issue was something internal to the inverter.</div><div><br></div><div>Thanks!</div><div>-Dave<br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr"
class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"></div></div></div></div><div dir="ltr"><table cellpadding="0" cellspacing="0" style="border-spacing:0px;border-collapse:collapse;color:rgb(68,68,68);width:525px;font-size:11pt;font-family:Arial,sans-serif"><tbody><tr><td width="125" valign="top" rowspan="6" style="font-family:Arial,sans-serif;padding:0px 10px 0px 0px;font-size:10pt;border-right:1px solid rgb(236,189,0);width:125px;vertical-align:top"><a href="https://www.sungineersolar.com/" style="color:rgb(51,122,183);background-color:transparent" target="_blank"><img border="0" alt="Logo" width="105" src="https://sungineersolar.com/wp-content/uploads/2019/08/Logo-Image-Only-1.png" style="border: 0px; vertical-align: middle;"></a></td><td style="padding:0px 0px 0px 10px"><table cellpadding="0" cellspacing="0" style="border-spacing:0px;border-collapse:collapse;background-color:transparent"><tbody><tr><td
valign="top" style="font-family:Arial,sans-serif;padding:0px 0px 5px 10px;width:400px;vertical-align:top"><span style="color:rgb(236,189,0);font-size:11pt;font-weight:700">Dave Tedeyan, P.E.<br></span><span style="font-size:11pt;font-weight:700"><font color="#ecbd00">Owner | Sungineer Solar</font><br></span></td></tr><tr><td valign="top" style="font-family:Arial,sans-serif;padding:5px 0px 5px 10px;font-size:10pt;vertical-align:top;line-height:17px"><span style="color:rgb(236,189,0)"><span style="font-weight:700">p: </span></span><span style="font-size:13.3333px"><span style="font-size:10pt;color:rgb(0,0,0)">he | him | his</span></span><span style="color:rgb(236,189,0)"><span style="font-weight:700"><br>a: </span></span><span style="font-size:10pt;color:rgb(0,0,0)">1653 Slaterville Rd.</span> <span style="font-size:10pt;color:rgb(0,0,0)">| Ithaca, NY 14850</span><br><span style="color:rgb(236,189,0)"><span style="font-weight:700">w:</span></span><a
href="http://www.sungineersolar.com/" rel="noopener" style="color:rgb(51,122,183);background-color:transparent" target="_blank"><span style="font-size:10pt;color:rgb(0,0,0)"><a href="http:// www.sungineersolar.com"> www.sungineersolar.com</a></span></a><br><span style="color:rgb(236,189,0)"><span style="font-weight:700">c:</span></span><span style="font-size:10pt;color:rgb(0,0,0)"> <a href="tel:(607) 270-0370">(607) 270-0370</a></span></td></tr></tbody></table></td></tr></tbody></table></div></div></div></div></div></div></div>
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