<div dir="ltr">Mike, <div>So if I understand you correctly, the newer SB inverters no longer need a manual restart when an arc fault is detected? There is one system where I've seen some arc fault messages, but I assumed it was not a real fault, since the inverter does not shut off.</div><div><br></div><div>Also, this is only piece of data and is from circa 2016, but the one time I have seen an arc fault actually due to the field wiring in a system, it was a loose connector going into one of the AC terminals on a TL-22 inverter.</div><div><br></div><div>Cheers,</div><div>Dave</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Dec 24, 2021 at 11:57 AM Harry Mahon <<a href="mailto:Michael.Mahon@sma-america.com">Michael.Mahon@sma-america.com</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">
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<div class="gmail-m_-1847781473783907798WordSection1">
<p class="MsoNormal">Bill \u2013 the AFCI circuitry is only looking at the DC inputs from the array. While certainly possible for external strong EMF source to \u201cimpart\u201d a signal on the DC conductors that triggers the AFCI circuitry, hopefully this is a low probability
occurrence.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Best regards \u2013 <u></u><u></u></p>
<p class="MsoNormal">Mike<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal"><br>
<span style="font-size:12pt">Michael Mahon</span><br>
Senior Technical Trainer, Solar Academy<br>
<b>SMA America</b> <u></u><u></u></p>
<p class="MsoNormal">3925 Atherton Rd<u></u><u></u></p>
<p class="MsoNormal">Rocklin, CA 95765<br>
Mobile: +1 916 918 9412<u><br>
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<div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0in 0in">
<p class="MsoNormal"><b>From:</b> RE-wrenches <<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>frenergy<br>
<b>Sent:</b> Thursday, December 23, 2021 10:56 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: [RE-wrenches] SMA arc faults<u></u><u></u></p>
</div>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
<p>Mike,<u></u><u></u></p>
<p> If I understand SMA's AFCI detection system right, it detects arc on the AC and DC side of the inverter. If correct, and from my "AFCI reset" experiences, it seems to also trip with some area lighting strikes. It would certainly be helpful in
finding the issue to know at least if it was a DC side or AC side event.<u></u><u></u></p>
<p>Bill<u></u><u></u></p>
<pre>Feather River Solar Electric <u></u><u></u></pre>
<pre>Bill Battagin, Owner<u></u><u></u></pre>
<pre>4291 Nelson St.<u></u><u></u></pre>
<pre>Taylorsville, CA 95983<u></u><u></u></pre>
<pre>530.284.7849<u></u><u></u></pre>
<pre>CA Lic 874049<u></u><u></u></pre>
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<div>
<p class="MsoNormal">On 12/23/2021 11:55 AM, Harry Mahon wrote:<u></u><u></u></p>
</div>
<blockquote style="margin-top:5pt;margin-bottom:5pt">
<p class="MsoNormal">Mac & Wrenches - <u></u><u></u></p>
<p class="MsoNormal">SMA has endeavored to continuously improve the reliability and accuracy of our AFCI detection, and it is heartening to see the comments in this thread. Recent FW update provides the option of enabling automatic restarting from AFCI in
the CORE1 US-41 product. The Sunny Boy US-41 line with most recent FW will have automatic restarts enabled. The source of multiple events should be investigated thoroughly. Registering SMA systems to the ennexOS Sunny Portal allows for remote parameter updates
as well as automatic FW updates. In addition, event reports can be configured so those who should know are notified if AFCI events are logged.<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Best regards \u2013<u></u><u></u></p>
<p class="MsoNormal">Mike<u></u><u></u></p>
<p class="MsoNormal"><br>
<span style="font-size:12pt">Michael Mahon</span><br>
Senior Technical Trainer, Solar Academy<br>
<b>SMA America</b> <u></u><u></u></p>
<p class="MsoNormal">3925 Atherton Rd<u></u><u></u></p>
<p class="MsoNormal">Rocklin, CA 95765<br>
Mobile: +1 916 918 9412<u><br>
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<div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0in 0in">
<p class="MsoNormal"><b>From:</b> RE-wrenches <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>Dave Tedeyan<br>
<b>Sent:</b> Saturday, December 18, 2021 6:28 PM<br>
<b>To:</b> RE-wrenches <a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank"><re-wrenches@lists.re-wrenches.org></a><br>
<b>Subject:</b> Re: [RE-wrenches] SMA arc faults<u></u><u></u></p>
</div>
<p class="MsoNormal"> <u></u><u></u></p>
<div>
<div>
<p class="MsoNormal">Hi Mac,<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Might I ask what modules these are connected to? There is some history here with Sunpower modules (and possibly other high power, high voltage modules). In these cases the issue is the module. If that's the case I can provide some more
detail about it.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">As for remote resetting, it is actually possible. Although it takes some networking knowhow that I am not savvy enough to tell you the specifics. I believe it is possible to remotely access the inverter through some kind of port forwarding.
So you can always reset the inverter by physically being there and doing the right power cycle and taps (depending on the inverter model), but you can also reset the arc fault through the computer (or smart phone) inverter interface.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">There is also one other thing you can try if there is no shading. At least with the Sunpower module issue, the inverter would always trip when it does an MPPT sweep. With the optitrac global peak that the sma inverters use, they do a full
MPPT sweep every 6 to 30 minutes. You can turn this off, and sometimes that will stop the arc faults. But that also means that partial shading can take out a whole string, rather than just a modules worth of voltage.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Cheers,<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12pt">Dave<u></u><u></u></p>
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<p class="MsoNormal">On Sat, Dec 18, 2021, 4:15 PM Jason Szumlanski <<a href="mailto:jason@floridasolardesigngroup.com" target="_blank">jason@floridasolardesigngroup.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">I haven't seen many, but every one I've seen has been a melted MC4 connector. <u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal">Jason Szumlanski<u></u><u></u></p>
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<p class="MsoNormal">Florida Solar Design Group<u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal">On Sat, Dec 18, 2021, 3:21 PM Jerry Shafer <<a href="mailto:jerrysgarage01@gmail.com" target="_blank">jerrysgarage01@gmail.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">Over the years every SMA arcfault has been real, l am also not saying hazard, well, AC, welding, all creat Arc noise in the system and it can be from a normal contactor arc. I have also seen AM arc faults caused by defective or knock off
MC connectors, in adequately stripped wires that result in the screw down connection on the insulator causing arc in the connector. <u></u><u></u></p>
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<p class="MsoNormal">Jerry<u></u><u></u></p>
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<p class="MsoNormal">NABCEP PV Inspestor<u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
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<pre><u></u> <u></u></pre>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"></div></div></div></div><div dir="ltr"><table cellpadding="0" cellspacing="0" style="border-spacing:0px;border-collapse:collapse;color:rgb(68,68,68);width:525px;font-size:11pt;font-family:Arial,sans-serif"><tbody><tr><td width="125" valign="top" rowspan="6" style="font-family:Arial,sans-serif;padding:0px 10px 0px 0px;font-size:10pt;border-right:1px solid rgb(236,189,0);width:125px;vertical-align:top"><a href="https://www.sungineersolar.com/" style="color:rgb(51,122,183);background-color:transparent" 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;"></a></td><td style="padding:0px 0px 0px 10px"><table cellpadding="0" cellspacing="0" style="border-spacing:0px;border-collapse:collapse;background-color:transparent"><tbody><tr><td valign="top" style="font-family:Arial,sans-serif;padding:0px 0px 5px 10px;width:400px;vertical-align:top"><span style="color:rgb(236,189,0);font-size:11pt;font-weight:700">Dave Tedeyan, P.E.<br></span><span style="font-size:11pt;font-weight:700"><font color="#ecbd00">Owner | Sungineer Solar</font><br></span></td></tr><tr><td valign="top" style="font-family:Arial,sans-serif;padding:5px 0px 5px 10px;font-size:10pt;vertical-align:top;line-height:17px"><span style="color:rgb(236,189,0)"><span style="font-weight:700">p: </span></span><span style="font-size:13.3333px"><span style="font-size:10pt;color:rgb(0,0,0)">he | him | his</span></span><span style="color:rgb(236,189,0)"><span style="font-weight:700"><br>a: </span></span><span style="font-size:10pt;color:rgb(0,0,0)">1653 Slaterville Rd.</span> <span style="font-size:10pt;color:rgb(0,0,0)">| Ithaca, NY 14850</span><br><span style="color:rgb(236,189,0)"><span style="font-weight:700">w:</span></span><a href="http://www.sungineersolar.com/" rel="noopener" style="color:rgb(51,122,183);background-color:transparent" target="_blank"><span style="font-size:10pt;color:rgb(0,0,0)"> www.sungineersolar.com</span></a><br><span style="color:rgb(236,189,0)"><span style="font-weight:700">c:</span></span><span style="font-size:10pt;color:rgb(0,0,0)"> (607) 288-2898</span></td></tr></tbody></table></td></tr></tbody></table></div></div></div></div>