<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /></head><body style='font-size: 10pt; font-family: Verdana,Geneva,sans-serif'>
<p><span style="font-size: 12pt;">It could be the inverter. The TL-22 series had a lot of problems with false arc fault errors. </span></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>
<div id="signature">---<br />
<div class="pre" style="margin: 0; padding: 0; font-family: monospace"> </div>
</div>
<p><br /></p>
<p id="reply-intro">On 2023-12-13 10:52, Dave Tedeyan via RE-wrenches wrote:</p>
<blockquote type="cite" style="padding: 0 0.4em; border-left: #1010ff 2px solid; margin: 0">
<div id="replybody1">
<div dir="ltr">Hi All,
<div><br />
<div>I am curious to hear if anyone else has run into this:</div>
<div> </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> </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> </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> </div>
<div>Thanks!</div>
<div>-Dave<br clear="all" />
<div> </div>
<span class="v1gmail_signature_prefix">-- </span><br />
<div class="v1gmail_signature" dir="ltr">
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div dir="ltr"> </div>
</div>
</div>
</div>
<div dir="ltr">
<table style="border-spacing: 0px; border-collapse: collapse; color: #444444; width: 525px; font-size: 11pt; font-family: Arial,sans-serif;" cellspacing="0" cellpadding="0">
<tbody>
<tr>
<td style="font-family: Arial,sans-serif; padding: 0px 10px 0px 0px; font-size: 10pt; border-right: 1px solid #ecbd00; width: 125px; vertical-align: top;" rowspan="6" valign="top" width="125"><a style="color: #337ab7; background-color: transparent;" href="https://www.sungineersolar.com/" target="_blank" rel="noopener noreferrer"><img style="border: 0px; vertical-align: middle; width: 105px; height: auto;" src="https://sungineersolar.com/wp-content/uploads/2019/08/Logo-Image-Only-1.png" alt="Logo" width="105" border="0" /></a></td>
<td style="padding: 0px 0px 0px 10px;">
<table style="border-spacing: 0px; border-collapse: collapse; background-color: transparent;" cellspacing="0" cellpadding="0">
<tbody>
<tr>
<td style="font-family: Arial,sans-serif; padding: 0px 0px 5px 10px; width: 400px; vertical-align: top;" valign="top"><span style="color: #ecbd00; font-size: 11pt; font-weight: bold;">Dave Tedeyan, P.E.<br /></span><span style="font-size: 11pt; font-weight: bold;"><span style="color: #ecbd00;">Owner | Sungineer Solar</span><br /></span></td>
</tr>
<tr>
<td style="font-family: Arial,sans-serif; padding: 5px 0px 5px 10px; font-size: 10pt; vertical-align: top; line-height: 17px;" valign="top"><span style="color: #ecbd00;"><span style="font-weight: bold;">p: </span></span><span style="font-size: 13.3333px;"><span style="font-size: 10pt; color: #000000;">he | him | his</span></span><span style="color: #ecbd00;"><span style="font-weight: bold;"><br />a: </span></span><span style="font-size: 10pt; color: #000000;">1653 Slaterville Rd.</span> <span style="font-size: 10pt; color: #000000;">| Ithaca, NY 14850</span><br /><span style="color: #ecbd00;"><span style="font-weight: bold;">w:</span></span><a style="color: #337ab7; background-color: transparent;" href="http://www.sungineersolar.com/" target="_blank" rel="noopener noreferrer"><span style="font-size: 10pt; color: #000000;"> www.sungineersolar.com</span></a><br /><span style="color: #ecbd00;"><span style="font-weight: bold;">c:</span></span><span style="font-size: 10pt; color: #000000;"> (607) 270-0370</span></td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br />
<div class="pre" style="margin: 0; padding: 0; font-family: monospace">_______________________________________________<br />List sponsored by Redwood Alliance<br /><br />Pay optional member dues here: <a href="http://re-wrenches.org" target="_blank" rel="noopener noreferrer">http://re-wrenches.org</a><br /><br />List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">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" rel="noopener noreferrer">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" rel="noopener noreferrer">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" rel="noopener noreferrer">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" rel="noopener noreferrer">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" rel="noopener noreferrer">http://www.members.re-wrenches.org</a><br /><br /></div>
</blockquote>
</body></html>