<div dir="ltr">Jay, <div>Not a bad idea to spray the array down in general. That would certainly help if I can recreate the issue, and then do it again after making any repairs or bypassing modules to see if it happens again. </div><div><br></div><div>Although, does anyone know whether the Fronius (Primo) Inverters only do the insulation resistance test first thing in the morning when it wakes up, or whether it constantly checks this sort of thing? I am guessing a hard ground fault would get picked up immediately, but just having an insulation resistance lower than some threshold might not get picked up until the following morning (or maybe an inverter reset).<br><br></div><div>Based on answers here, and knowing that there was previous squirrel damage, I am guessing its more likely that squirrels are to blame rather than this one cell. (I am pretty sure those jerks are in cahoots with the oil companies).</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Thu, May 8, 2025 at 10:46 PM Jay 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 dir="auto"><div dir="ltr"></div><div dir="ltr">Sometimes spraying soapy water onto the suspect panel is enough to recreate the issue. A simple spray bottle will do. </div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br><blockquote type="cite">On May 8, 2025, at 6:28 PM, David Coale via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">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><br></div><div>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><br></div><div>David</div><div><br></div><div><br><div><blockquote type="cite"><div>On May 8, 2025, at 12:55 PM, david quattro via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:</div><br><div><div dir="auto">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"> Good luck, and let us know!</div><div dir="auto"><br></div><div dir="auto"><br></div><div><br><div class="gmail_quote"><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" target="_blank">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 dir="ltr"><div><div>Hello, </div><div><br></div><div>There is an installation that I am servicing with the Q.Peak G4 modules, where one <span>cell</span> has some visible <span>damage</span>. I am wondering whether this type <span>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><br></div><div>Thanks!</div><div>Dave</div></div><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><br style="color:rgb(34,34,34)"><div dir="ltr" style="color:rgb(34,34,34)"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"></div></div></div><div dir="ltr"><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)"><tbody style="font-family:Arial,sans-serif"><tr style="font-family:Arial,sans-serif"><td width="125" valign="top" rowspan="6" style="padding:0px 10px 0px 0px;font-size:10pt;border-right:1px solid rgb(236,189,0);width:125px;vertical-align:top;font-family:Arial,sans-serif"><a href="https://www.sungineersolar.com/" style="font-family:Arial,sans-serif;background-color:transparent;color:rgb(51,122,183)" 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; width: 105px; height: auto; font-family: Arial, sans-serif;"></a></td><td style="padding:0px 0px 0px 10px;font-family:Arial,sans-serif"><table cellpadding="0" cellspacing="0" style="border-spacing:0px;border-collapse:collapse;font-family:Arial,sans-serif;background-color:transparent"><tbody style="font-family:Arial,sans-serif"><tr style="font-family:Arial,sans-serif"><td valign="top" style="padding:0px 0px 5px 10px;width:400px;vertical-align:top;font-family:Arial,sans-serif"><span style="font-size:11pt;font-weight:700;font-family:Arial,sans-serif;color:rgb(236,189,0)">Dave Tedeyan, P.E.<br></span><span style="font-size:11pt;font-weight:700;font-family:Arial,sans-serif"><font style="font-family:Arial,sans-serif;color:rgb(236,189,0)">Owner | Sungineer Solar</font><br></span></td></tr><tr style="font-family:Arial,sans-serif"><td valign="top" style="padding:5px 0px 5px 10px;font-size:10pt;vertical-align:top;line-height:17px;font-family:Arial,sans-serif"><span style="font-family:Arial,sans-serif;color:rgb(236,189,0)"><span style="font-weight:700;font-family:Arial,sans-serif">p: </span></span><span style="font-size:10pt;font-family:Arial,sans-serif">he | him | his</span><span style="font-family:Arial,sans-serif;color:rgb(236,189,0)"><span style="font-weight:700;font-family:Arial,sans-serif"><br>a: </span></span><span style="font-size:10pt;font-family:Arial,sans-serif"><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" target="_blank">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" target="_blank"> </a><span style="font-size:10pt;font-family:Arial,sans-serif"><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" target="_blank">| Ithaca, NY 14850</a></span><br><span style="font-family:Arial,sans-serif;color:rgb(236,189,0)"><span style="font-weight:700;font-family:Arial,sans-serif">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"><span style="font-size:10pt;font-family:Arial,sans-serif"> www.sungineersolar.com</span></a><br><span style="font-family:Arial,sans-serif;color:rgb(236,189,0)"><span style="font-weight:700;font-family:Arial,sans-serif">c:</span></span><span style="font-size:10pt;font-family:Arial,sans-serif"> (607) 270-0370</span></td></tr></tbody></table></td></tr></tbody></table></div></div></div></div></div></div>
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