<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">I am having the same issue, but it is with an SMA inverter. In my case it happens when it is raining and clears up when it dries out. I can see there are some bad cells, but they are right next to the edge of the panel so a moisture problem would show up this way. Good to know about sealing the conduits.<div class=""><br class=""></div><div class="">In your case, you should be able to disconnect the suspected string or jump around the suspected panel and figure this out. Other wise I would blame it on the squirrels. But then again, I blame everything on rogue squirrels or rats.</div><div class=""><br class=""></div><div class="">David</div><div class=""><br class=""></div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On May 8, 2025, at 12:55 PM, david quattro via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" class="">re-wrenches@lists.re-wrenches.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="auto" class="">Fronius install manual says the conduit entry ports need to be packed with putty around the wires. They’re the only manufacturer I know of that requires this. Water vapor roses into the circuit boards. I used to get a couple different error codes until we packed the conduits.</div><div dir="auto" class=""> Good luck, and let us know!</div><div dir="auto" class=""><br class=""></div><div dir="auto" class=""><br class=""></div><div class=""><br class=""><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Thu, May 8, 2025 at 12:22 PM Dave Tedeyan via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" class="">re-wrenches@lists.re-wrenches.org</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div dir="ltr" class=""><div class=""><div class="">Hello, </div><div class=""><br class=""></div><div class="">There is an installation that I am servicing with the Q.Peak G4 modules, where one <span class="">cell</span> has some visible <span class="">damage</span>. I am wondering whether this type <span class="">damage</span> can lead to a ground fault? The Fronius inverter on site is picking up an "Insulation Resist" error. I am wondering whether this could be the cause, or whether I should look elsewhere in the array. A photo is attached. Any thoughts would be appreciated.</div><div class=""><br class=""></div><div class="">Thanks!</div><div class="">Dave</div></div><div class=""><br class=""></div><span class="gmail_signature_prefix">-- </span><br class=""><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr" class=""><br style="color:rgb(34,34,34)" class=""><div dir="ltr" style="color:rgb(34,34,34)" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""></div></div></div><div dir="ltr" class=""><table cellpadding="0" cellspacing="0" style="border-spacing:0px;border-collapse:collapse;width:525px;font-size:11pt;font-family:Arial,sans-serif;color:rgb(68,68,68)" class=""><tbody style="font-family:Arial,sans-serif" class=""><tr style="font-family:Arial,sans-serif" class=""><td width="125" valign="top" rowspan="6" style="padding:0px 10px 0px 0px;font-size:10pt;border-right-width:1px;border-right-style:solid;width:125px;vertical-align:top;font-family:Arial,sans-serif;border-right-color:rgb(236,189,0)" class=""><a href="https://www.sungineersolar.com/" style="font-family:Arial,sans-serif;background-color:transparent;color:rgb(51,122,183)" target="_blank" class=""><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; width: 105px; height: auto; font-family: Arial, sans-serif;" class=""></a></td><td style="padding:0px 0px 0px 10px;font-family:Arial,sans-serif" class=""><table cellpadding="0" cellspacing="0" style="border-spacing:0px;border-collapse:collapse;font-family:Arial,sans-serif;background-color:transparent" class=""><tbody style="font-family:Arial,sans-serif" class=""><tr style="font-family:Arial,sans-serif" class=""><td valign="top" style="padding:0px 0px 5px 10px;width:400px;vertical-align:top;font-family:Arial,sans-serif" class=""><span style="font-size:11pt;font-weight:700;font-family:Arial,sans-serif;color:rgb(236,189,0)" class="">Dave Tedeyan, P.E.<br class=""></span><span style="font-size:11pt;font-weight:700;font-family:Arial,sans-serif" class=""><font style="font-family:Arial,sans-serif;color:rgb(236,189,0)" class="">Owner | Sungineer Solar</font><br class=""></span></td></tr><tr style="font-family:Arial,sans-serif" class=""><td valign="top" style="padding:5px 0px 5px 10px;font-size:10pt;vertical-align:top;line-height:17px;font-family:Arial,sans-serif" class=""><span style="font-family:Arial,sans-serif;color:rgb(236,189,0)" class=""><span style="font-weight:700;font-family:Arial,sans-serif" class="">p: </span></span><span style="font-size: 10pt; font-family: Arial, sans-serif;" class="">he | him | his</span><span style="font-family:Arial,sans-serif;color:rgb(236,189,0)" class=""><span style="font-weight:700;font-family:Arial,sans-serif" class=""><br class="">a: </span></span><span style="font-size: 10pt; font-family: Arial, sans-serif;" class=""><a href="https://www.google.com/maps/search/1653+Slaterville+Rd.+%C2%A0+%7C%C2%A0Ithaca,+NY+14850?entry=gmail&source=g" style="font-family:Arial,sans-serif" class="">1653 Slaterville Rd.</a></span><a href="https://www.google.com/maps/search/1653+Slaterville+Rd.+%C2%A0+%7C%C2%A0Ithaca,+NY+14850?entry=gmail&source=g" style="font-family:Arial,sans-serif" class=""> </a><span style="font-size: 10pt; font-family: Arial, sans-serif;" class=""><a href="https://www.google.com/maps/search/1653+Slaterville+Rd.+%C2%A0+%7C%C2%A0Ithaca,+NY+14850?entry=gmail&source=g" style="font-family:Arial,sans-serif" class="">| Ithaca, NY 14850</a></span><br class=""><span style="font-family:Arial,sans-serif;color:rgb(236,189,0)" class=""><span style="font-weight:700;font-family:Arial,sans-serif" class="">w:</span></span><a href="http://www.sungineersolar.com/" rel="noopener" style="font-family:Arial,sans-serif;background-color:transparent;color:rgb(51,122,183)" target="_blank" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class=""> www.sungineersolar.com</span></a><br class=""><span style="font-family:Arial,sans-serif;color:rgb(236,189,0)" class=""><span style="font-weight:700;font-family:Arial,sans-serif" class="">c:</span></span><span style="font-size: 10pt; font-family: Arial, sans-serif;" class=""> (607) 270-0370</span></td></tr></tbody></table></td></tr></tbody></table></div></div></div></div></div></div>
_______________________________________________<br class="">
List sponsored by Redwood Alliance<br class="">
<br class="">
Pay optional member dues here: <a href="http://re-wrenches.org/" rel="noreferrer" target="_blank" class="">http://re-wrenches.org</a><br class="">
<br class="">
List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank" class="">RE-wrenches@lists.re-wrenches.org</a><br class="">
<br class="">
Change listserver email address & settings:<br class="">
<a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" rel="noreferrer" target="_blank" class="">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br class="">
<br class="">
There are two list archives for searching. When one doesn't work, try the other:<br class="">
<a href="https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/" rel="noreferrer" target="_blank" class="">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a><br class="">
<a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" rel="noreferrer" target="_blank" class="">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br class="">
<br class="">
List rules & etiquette:<br class="">
<a href="http://www.re-wrenches.org/etiquette.htm" rel="noreferrer" target="_blank" class="">http://www.re-wrenches.org/etiquette.htm</a><br class="">
<br class="">
Check out or update participant bios:<br class="">
<a href="http://www.members.re-wrenches.org/" rel="noreferrer" target="_blank" class="">http://www.members.re-wrenches.org</a><br class="">
<br class="">
</blockquote></div></div>
_______________________________________________<br class="">List sponsored by Redwood Alliance<br class=""><br class="">Pay optional member dues here: <a href="http://re-wrenches.org" class="">http://re-wrenches.org</a><br class=""><br class="">List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" class="">RE-wrenches@lists.re-wrenches.org</a><br class=""><br class="">Change listserver email address & settings:<br class=""><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" class="">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br class=""><br class="">There are two list archives for searching. When one doesn't work, try the other:<br class="">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/<br class="">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org<br class=""><br class="">List rules & etiquette:<br class="">http://www.re-wrenches.org/etiquette.htm<br class=""><br class="">Check out or update participant bios:<br class="">http://www.members.re-wrenches.org<br class=""><br class=""></div></blockquote></div><br class=""></div></body></html>