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<p>Mike,</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.</p>
<p>Bill</p>
<pre class="moz-signature" cols="72">Feather River Solar Electric
Bill Battagin, Owner
4291 Nelson St.
Taylorsville, CA 95983
530.284.7849
CA Lic 874049
<a class="moz-txt-link-abbreviated" href="http://www.frenergy.net">www.frenergy.net</a></pre>
<div class="moz-cite-prefix">On 12/23/2021 11:55 AM, Harry Mahon
wrote:<br>
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<p class="MsoNormal">Mac & Wrenches - <o:p></o:p></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.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best regards \u2013<o:p></o:p></p>
<p class="MsoNormal">Mike<o:p></o:p></p>
<p class="MsoNormal"><br>
<span style="font-size:12.0pt">Michael Mahon</span><br>
Senior Technical Trainer, Solar Academy<br>
<b>SMA America</b> <o:p></o:p></p>
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<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> RE-wrenches
<a class="moz-txt-link-rfc2396E" href="mailto:re-wrenches-bounces@lists.re-wrenches.org"><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 class="moz-txt-link-rfc2396E" href="mailto:re-wrenches@lists.re-wrenches.org"><re-wrenches@lists.re-wrenches.org></a><br>
<b>Subject:</b> Re: [RE-wrenches] SMA arc faults<o:p></o:p></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">Hi Mac,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></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.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></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.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></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.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Cheers,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt">Dave<o:p></o:p></p>
<div>
<div>
<p class="MsoNormal">On Sat, Dec 18, 2021, 4:15 PM Jason
Szumlanski <<a
href="mailto:jason@floridasolardesigngroup.com"
moz-do-not-send="true" class="moz-txt-link-freetext">jason@floridasolardesigngroup.com</a>>
wrote:<o:p></o:p></p>
</div>
<blockquote style="border:none;border-left:solid #CCCCCC
1.0pt;padding:0in 0in 0in
6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<p class="MsoNormal">I haven't seen many, but every
one I've seen has been a melted MC4 connector. <o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Jason Szumlanski<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Florida Solar Design Group<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">On Sat, Dec 18, 2021, 3:21 PM
Jerry Shafer <<a
href="mailto:jerrysgarage01@gmail.com"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">jerrysgarage01@gmail.com</a>>
wrote:<o:p></o:p></p>
</div>
<blockquote style="border:none;border-left:solid
#CCCCCC 1.0pt;padding:0in 0in 0in
6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<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. <o:p></o:p></p>
<div>
<p class="MsoNormal">Jerry<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">NABCEP PV Inspestor<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<br>
</blockquote>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
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