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<p class="MsoNormal">It depends on how bad the fault is. Insulation resistance testing can definitely find some intermittent ground faults.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Will<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> RE-wrenches <re-wrenches-bounces@lists.re-wrenches.org>
<b>On Behalf Of </b>Dave Tedeyan via RE-wrenches<br>
<b>Sent:</b> Wednesday, December 13, 2023 2:46 PM<br>
<b>To:</b> RE-wrenches <re-wrenches@lists.re-wrenches.org><br>
<b>Cc:</b> Dave Tedeyan <dave@sungineersolar.com><br>
<b>Subject:</b> [EXTERNAL] Re: [RE-wrenches] SMA TL-22 insulation resistance error<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p><strong><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#CC3300;background:#FFD480">CAUTION:</span></strong><span style="font-size:10.0pt;color:black;background:#FFD480"> This email originated from outside of the organization. Do not
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<p class="MsoNormal">Just an FYI, it is specifically an "insulation resistance" error that the inverter is throwing, and not an "arc fault" error. Fortunately it is not an arc fault. Meggering is not a bad idea, although due to the fact that the fault is intermittent,
that might not show anything? <o:p></o:p></p>
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<p class="MsoNormal">Cheers,<o:p></o:p></p>
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<p class="MsoNormal">Dave<o:p></o:p></p>
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<p class="MsoNormal">On Wed, Dec 13, 2023 at 12:30 PM August Goers via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">You might want to make sure that the SMA inverter has the latest firmware. It's been a long time since we've routinely installed these, but at one point arc faults were being falsely tripped and firmware updates from SMA helped with the
issue. <o:p></o:p></p>
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<p class="MsoNormal"><a href="https://urldefense.com/v3/__https:/my.sma-service.com/s/article/Loading-Firmware-for-an-SB-US-TL22-or-STP-US-10-using-a-2-GB-SD-Card?language=en_US__;!!KPww_GFiJXw!bV9p8CXDOhVnAlkApapaa8cqF7DOgvGBhkp-heU3byC7UqlQMnQcZByfUUQAUjJA5fRu_oSUKwElws1RsnCCmXdh9ZPVGCf4$" target="_blank">https://my.sma-service.com/s/article/Loading-Firmware-for-an-SB-US-TL22-or-STP-US-10-using-a-2-GB-SD-Card?language=en_US</a><o:p></o:p></p>
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<p class="MsoNormal">August<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Luminalt<o:p></o:p></p>
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<p class="MsoNormal">On Wed, Dec 13, 2023 at 9:07 AM Jay via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">I think that using a megger etc to test the panels and wires is what I’d do before I yanked out all the <o:p></o:p></p>
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<p class="MsoNormal">Wires. <o:p></o:p></p>
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<p class="MsoNormal">They are not that expensive anymore and maybe possible to rent one?<o:p></o:p></p>
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<p class="MsoNormal">Jay<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">On Dec 13, 2023, at 8:53 AM, Dave Tedeyan via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Hi All, <o:p></o:p></p>
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<p class="MsoNormal">I am curious to hear if anyone else has run into this:<o:p></o:p></p>
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<p class="MsoNormal">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!<o:p></o:p></p>
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<p class="MsoNormal">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. <o:p></o:p></p>
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<p class="MsoNormal">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.<o:p></o:p></p>
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<p class="MsoNormal">Thanks!<o:p></o:p></p>
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<p class="MsoNormal">-Dave<br clear="all">
<o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#ECBD00">Dave Tedeyan, P.E.<br>
Owner | Sungineer Solar</span></b><span style="font-family:"Arial",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:12.75pt"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#ECBD00">p: </span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">he | him | his</span><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#ECBD00"><br>
a: </span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">1653 Slaterville Rd.</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"> <span style="color:black">| Ithaca, NY 14850</span><br>
<b><span style="color:#ECBD00">w:</span></b><a href="https://urldefense.com/v3/__http:/www.sungineersolar.com/__;!!KPww_GFiJXw!bV9p8CXDOhVnAlkApapaa8cqF7DOgvGBhkp-heU3byC7UqlQMnQcZByfUUQAUjJA5fRu_oSUKwElws1RsnCCmXdh9cAjGEY8$" target="_blank"><span style="color:black"> www.sungineersolar.com</span></a><br>
<b><span style="color:#ECBD00">c:</span></b><span style="color:black"> (607) 270-0370</span><o:p></o:p></span></p>
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<p class="MsoNormal"><a href="https://urldefense.com/v3/__https:/www.sungineersolar.com/__;!!KPww_GFiJXw!bV9p8CXDOhVnAlkApapaa8cqF7DOgvGBhkp-heU3byC7UqlQMnQcZByfUUQAUjJA5fRu_oSUKwElws1RsnCCmXdh9W8rWEMe$" target="_blank"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#337AB7;text-decoration:none"><img border="0" width="105" height="103" style="width:1.0937in;height:1.0729in" id="_x0000_i1025" src="https://sungineersolar.com/wp-content/uploads/2019/08/Logo-Image-Only-1.png" alt="Logo"></span></a><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#444444"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#ECBD00">Dave Tedeyan, P.E.<br>
Owner | Sungineer Solar</span></b><span style="font-family:"Arial",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:12.75pt"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#ECBD00">p: </span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">he | him | his</span><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#ECBD00"><br>
a: </span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">1653 Slaterville Rd.</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"> <span style="color:black">| Ithaca, NY 14850</span><br>
<b><span style="color:#ECBD00">w:</span></b><a href="https://urldefense.com/v3/__http:/www.sungineersolar.com/__;!!KPww_GFiJXw!bV9p8CXDOhVnAlkApapaa8cqF7DOgvGBhkp-heU3byC7UqlQMnQcZByfUUQAUjJA5fRu_oSUKwElws1RsnCCmXdh9cAjGEY8$" target="_blank"><span style="color:black"> www.sungineersolar.com</span></a><br>
<b><span style="color:#ECBD00">c:</span></b><span style="color:black"> (607) 270-0370</span><o:p></o:p></span></p>
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