<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr">Certainly looks like a problem with the inverter vs a wiring/panel problem. </div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br><blockquote type="cite">On Apr 6, 2025, at 11:35\u202fAM, Jason Szumlanski via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">\ufeff<div dir="auto"><div>I should mention that the other inverter also has three strings and is experiencing no faults. Neither inverter has an EGC landed in it from the array.</div><div><br></div><div data-smartmail="gmail_signature"><div dir="ltr"><br>Jason Szumlanski<div><br></div></div></div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Sun, Apr 6, 2025, 11:47\u202fAM david quattro <<a href="mailto:david@quattrosolar.com">david@quattrosolar.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto">Tech support said if it\u2019s landed in conjunction with the Load Out ground it causes an \u2018echo\u2019 on the grounds. Can result in erroneous Arc fault or other error codes.<span style="font-family:-apple-system,helveticaneue;background-color:rgba(0,0,0,0);border-color:rgb(0,0,0);color:rgb(0,0,0)"> </span></div><div dir="auto"><span style="font-family:-apple-system,helveticaneue;background-color:rgba(0,0,0,0);border-color:rgb(0,0,0);color:rgb(0,0,0)"> I think if using a separate wire trough, that trough needs to be physically far from the inverter and close to an electrode.</span></div><div dir="auto"><br></div><div dir="auto"><br></div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Apr 6, 2025 at 8:09\u202fAM Jason Szumlanski <<a href="mailto:jason@floridasolardesigngroup.com" target="_blank" rel="noreferrer">jason@floridasolardesigngroup.com</a>> wrote:<br></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"><div dir="ltr"><div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">That's a good point. I didn't install this system, but I know for certain the PV EGC is not landed in either of the dual Sol-Ark inverters. It must be landed on a grounding terminal in a wiring trough or load center. I'll have to track that down. I'm not sure how the GE system is installed, either.</div><br clear="all"></div><div><div dir="ltr" class="gmail_signature"><div dir="ltr"><br>Jason Szumlanski<div><span style="font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px;color:rgb(51,51,51)">Principal Solar Designer | Florida Solar Design Group</span><br style="color:rgb(51,51,51);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px"><span style="font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px;color:rgb(51,51,51)">NABCEP Certified Solar Professional (PVIP)</span><br style="color:rgb(51,51,51);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px"><span style="font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px;color:rgb(51,51,51)">Florida State Certified Solar Contractor CVC56956</span></div><div><font face="Roboto, RobotoDraft, Helvetica, Arial, sans-serif" style="font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;color:rgb(51,51,51)">Florida Certified Electrical Contractor EC13013208</font></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Apr 6, 2025 at 11:03\u202fAM david quattro <<a href="mailto:david@quattrosolar.com" target="_blank" rel="noreferrer">david@quattrosolar.com</a>> wrote:<br></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="auto">Hi Jason,</div><div dir="auto"> SolArk tech support has told us to land the PV equipment ground directly to an electrode. ie <span>d</span><span>o not</span> land the PV ground in the inverter\u2019s built in ground-bar. This detail wasn\u2019t in their manuals years ago. I hope this is helpful \U0001f919\U0001f3fc</div><div dir="auto">David</div><div dir="auto"><br></div><div dir="auto"><br></div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Apr 6, 2025 at 7:19\u202fAM Jason Szumlanski via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank" rel="noreferrer">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></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"><div><span class="gmail_default" style="font-family:arial,helvetica,sans-serif">If anyone is using this tester to do insulation resistance testing, I would appreciate any pointers you have.</span><br clear="all"></div><div><span class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></span></div><div><span class="gmail_default" style="font-family:arial,helvetica,sans-serif">I have used it successfully to test home run DC strings from rooftop junction boxes to inverters to check for nicks in wires and hard faults to ground or short circuits. However, I am currently facing a Sol-Ark 15K with three strings of PV that all seem to cause an intermittent DC insulation fault (F24). I have isolated each string by disconnecting the other strings at the rooftop junction box. With only one string connected to the inverter, regardless of which string it is, I will eventually get the F24 error. </span></div><div><span class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></span></div><div><span class="gmail_default" style="font-family:arial,helvetica,sans-serif">Since I have ruled out the home run wiring, It appears the issue must be within the array somewhere. I would like to use the ET600 to help track it down, but I am reading conflicting information on how to properly undertake the test on each string. I know that I can disconnect the conductors between each PV string and the junction box and test each jumper wire individually while disconnected. But what about the PV module leads within the string of connected modules? I'm suspecting a pinched PV module lead somewhere, but I don't know where to start looking.</span></div><div><span class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></span></div><div><span class="gmail_default" style="font-family:arial,helvetica,sans-serif">Jason Szumlanski</span></div><div><span class="gmail_default" style="font-family:arial,helvetica,sans-serif">Florida Solar Design Group</span></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><div dir="ltr" class="gmail_signature"></div></div></div>
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