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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">We’ve seen random AFCI trips with SB-TL-22 inverters. After going through the last system checking all connections including the possibility of a loose MC4
connection the fault was still present. SMA then told us they had a new firmware release, when it was installed the problem went away.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Gary<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Calibri","sans-serif";color:#919191">Gary Bassett</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Calibri","sans-serif";color:#919191">Engineering Manager</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Calibri","sans-serif";color:#919191">Hudson Solar</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Calibri","sans-serif";color:#919191">13 Hook Road</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Calibri","sans-serif";color:#919191">Rhinebeck, NY</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#919191">T: (866) 452-7652 x113</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#7F7F7F">NABCEP Certified PV Installation Professional</span></i><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#919191"><u><span style="color:blue">HudsonSolar.com</span></u></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> RE-wrenches [mailto:re-wrenches-bounces@lists.re-wrenches.org]
<b>On Behalf Of </b>Dave Tedeyan<br>
<b>Sent:</b> Thursday, March 24, 2016 8:38 AM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] AFCI trip on metal roof<o:p></o:p></span></p>
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<p class="MsoNormal">Recently we have had the AFCI trip in a couple SB-TL-22 inverters. Restarted the inverter, the fault was not still present. It has not tripped in the month since at either site. Maybe an issue with the inverter? Only time will tell.<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"><b><span style="font-family:"Arial","sans-serif"">Dave Tedeyan</span></b><o:p></o:p></p>
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<p class="MsoNormal"><b>Project Engineer</b><o:p></o:p></p>
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<p class="MsoNormal"><b>Taitem Engineering, PC</b><o:p></o:p></p>
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<p class="MsoNormal">109<span style="color:black"> S. Albany Street, Ithaca, NY 14850</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="color:black">Voice: (607) 277-1118 x121</span><o:p></o:p></p>
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<p class="MsoNormal"><a href="http://www.taitem.com/" target="_blank"><span style="color:black">www.taitem.com</span></a><o:p></o:p></p>
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<p class="MsoNormal">On Wed, Mar 23, 2016 at 6:24 PM, AE Solar <<a href="mailto:autonomousenergies@gmail.com" target="_blank">autonomousenergies@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">We had that issue once. It was after a night of heavy rainfall and the error only read for the first few early hours of the day. SMA told us it was a poor connection in an MC4 connector that most likely got some dampness in it...<o:p></o:p></p>
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<p class="MsoNormal">Adam Katzman<br>
Autonomous Energies<br>
PO Box 1245<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Kingston, NY 12402<br>
<a href="http://www.autonomousenergies.com" target="_blank">www.autonomousenergies.com</a><br>
<a href="tel:%28518%29%20567-1468" target="_blank">(518) 567-1468</a><o:p></o:p></p>
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<p class="MsoNormal">On Wed, Mar 23, 2016 at 5:16 PM, August Goers <<a href="mailto:august@luminalt.com" target="_blank">august@luminalt.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Drake,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">What model SMA inverter(s) and modules do you have? We had one case where a MC4 connector under the
array was not making good contact. It was not seated properly when the installer made up the connector and the arc fault sensor in the inverter did its job. We had another site where some electrical noise on the AC side, presumably a sump pump, caused the
issue and we could not solve it so had to switch to another inverter manufacturer. There were other cases where the impedance or other electrical characteristics of the solar modules where the likely culprit.
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Is your roof and array totally equipment grounded?</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Best,</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">August</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> RE-wrenches [mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>]
<b>On Behalf Of </b>Drake<br>
<b>Sent:</b> Wednesday, March 23, 2016 2:08 PM<br>
<b>To:</b> <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches@lists.re-wrenches.org</a><br>
<b>Subject:</b> [RE-wrenches] AFCI trip on metal roof</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt">Hello Wrenches,
<o:p></o:p></p>
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We have a project with an array on a large metal roof. The AFCI has been tripping. Investigating the system, there is no evidence of any arcing: the wiring and connections are all very tight.
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SMA tech support says it is likely that the nuisance tripping comes from electrical noise getting picked up by the large metal roof.
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What has been your overall experience with nuisance tripping of arc fault protection? What were the suspected causes? What was the solution?<br>
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Thanks,<br>
<br>
Drake <br>
<br>
Drake Chamberlin<br>
<i>Athens Electric LLC<br>
OH License 44810<br>
CO License 3773<br>
NABCEP Certified Solar PV <br>
<a href="tel:740-448-7328" target="_blank">740-448-7328</a><br>
</i><a href="http://athens-electric.com/" target="_blank">http://athens-electric.com/</a>
<o:p></o:p></p>
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