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Electrical noise coming in from the utility side can also cause an arc
fault code.<br><br>
At 07:32 AM 11/11/2016, you wrote:<br>
<blockquote type=cite class=cite cite="">This array is a ground mount, so
not on a roof, and no radio towers nearby.<br><br>
As for grounding, The array and the shed with the interconnection point
are in the same area.<br>
There are a couple ground rods there, which everything on the AC side is
connected to, <br>
including a #6 wire from each inverter. there is just a #10 ground coming
from the array to the inverters. <br>
The house is a couple hundred feet away and has its own grounding
electrode system.<br><br>
Jerry,<br>
The inverters are new (replaced 2 months ago), but it is a good idea to
check firmware.<br>
As for AC loads, nothing stands out as the types of things you mentioned,
although there<br>
may be a well pump. They also do have a large water storage tank for
heating, but they<br>
say that they have not needed to use it yet this year. Then there is also
the generator...<br><br>
Thanks for your recommendations.<br>
-Dave<br><br>
<br><br>
<font face="arial"><b>--<br><br>
Dave Tedeyan</font><br>
Project Engineer<br>
</b><br>
<b>Taitem Engineering, PC<br>
</b>109Â S. Albany Street, Ithaca, NY 14850<br>
Voice:Â <a href="??">(607) 277-1118 x121</a><br>
<a href="http://www.taitem.com/">www.taitem.com</a><br>
<br>
On Thu, Nov 10, 2016 at 9:51 PM, Jerry Shafer
<<a href="mailto:jerrysgarage01@gmail.com">jerrysgarage01@gmail.com</a>
> wrote:<br>
<dl>
<dd>Dave.<br>
<dd>We have many TL-22 in the field and they will detect faults even when
they are normal contactor faults, have you made sure the SW is the
latest, last I checked it is 2.65.3R and it may have a patch in there,
you can turn off the feature for testing only and see if you melt
something down but if you do please be on site as a arc may happen. Do
you have a well, AC system with contacts, welders, compressors, anything
that has a dry contacts that brakes under load, this is another place I
would look. Every time we have had a code out it was real weather from
something normal or a wire issue. Not to brag but we have hundreds in the
field from the 3's to the 24's and as much as I dread getting a call with
this issue I can usually find the problem and it can be either AC or
DC.<font color="#888888"><br>
<dd>Jerry <br>
</font><br>
<dd>On Thu, Nov 10, 2016 at 8:14 AM, Dave Tedeyan
<<a href="mailto:dtedeyan@taitem.com">dtedeyan@taitem.com</a>>
wrote:<br>
<dl>
<dd>Hi All, <br><br>
<dd>Maybe someone will have some ideas for why a couple inverters keep
arc faulting:<br><br>
<dd>-There are two SB7000TL-22 inverters, Sunpower branded.<br>
<dd>-3 Strings of 7 SPR-327's to each inverter. Kept separate until the
inverter.<br>
<dd>-Ground mount about 50' from the shed where the inverters are located
(indoors)<br>
<dd>-Simple grid connected system, no batteries.<br>
<dd>-There is a whole house generator co-located in the shed.<br>
<dd>-We interconnect by using piercing taps on the line side of the
generator transfer switch<br>
<dd>-There has been only one power outage there since the system was
installed in April, but the generator fires up weekly.<br><br>
<dd>-The arc faults have been happening on both inverters. Sometimes only
one at a time, sometimes both will go within a day of each other.<br>
<dd>-The events have been approximately one a month, but sometimes more,
sometimes less.<br><br>
<dd>-We have already checked every single connection in the system twice,
by two different people.<br>
<dd>-We have replaced the underground wires (and they looked just
fine)<br>
<dd>-We have replaced all home runs.<br>
<dd>-We have replaced both inverters.<br>
<dd>-Arc faults are still happening.<br>
<dd>-Arc faults are not always on the same day/time of the week.<br><br>
<dd>I am wondering if this can be caused by the generator? <br>
<dd>Has anyone run into a situation like this or something
similar?<br><br>
<dd>Thanks for your help,<br>
<dd>Dave<br><br>
<dd><font face="arial">--<br><br>
<dd>Dave Tedeyan</font><br>
<dd>Project Engineer<br>
</b><br>
<dd>Taitem Engineering, PC<br>
</b>
<dd>109Â S. Albany Street, Ithaca, NY 14850<br>
<dd>Voice:Â <a href="??">(607) 277-1118 x121</a><br>
<dd><a href="http://www.taitem.com/">www.taitem.com</a><br>
<br>
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