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<p><font size="+1">I have found that single point grounding in large
complex systems can solve a lot strange problems. Just a
thought.</font></p>
<p><font size="+1"></font><br>
</p>
<pre class="moz-signature" cols="72">BZ Products INC.
8801 Gravois Rd.
St.Louis MO 63123 USA
314-644-2490
<a class="moz-txt-link-abbreviated" href="http://www.bz-products.net">www.bz-products.net</a></pre>
<div class="moz-cite-prefix">On 11/10/2016 3:20 PM, Drake wrote:<br>
</div>
<blockquote cite="mid:20161110212051.59477108CD@che.dreamhost.com"
type="cite">
Is your array on a large metal roof, or is it where intense radio
signals
could be getting picked up by your racking? Either of these
conditions
could potentially be your problem.<br>
<br>
At 01:37 PM 11/10/2016, you wrote:<br>
<blockquote type="cite" class="cite" cite="">Daryl, <br>
That is what I thought at first. Very rare, but I suppose not
impossible
that IÂ <br>
would have two inverters with bad arc fault detectors. But since
we are
still<br>
getting arc faults after replacing the inverters, I am thinking
that it
must be<br>
something else.<br>
<br>
Cheers, <br>
Dave<br>
<br>
<br>
<font face="arial"><b>--<br>
<br>
Dave Tedeyan</b></font><b><br>
Project Engineer<br>
</b><br>
<b>Taitem Engineering, PC<br>
</b>109Â S. Albany Street, Ithaca, NY 14850<br>
Voice:Â <a moz-do-not-send="true" href="??">(607) 277-1118 x121</a><br>
<a moz-do-not-send="true" href="http://www.taitem.com/">www.taitem.com</a><br>
<br>
On Thu, Nov 10, 2016 at 1:18 PM,
<<a moz-do-not-send="true"
href="mailto:penobscotsolar@midmaine.com">
penobscotsolar@midmaine.com</a>> wrote:<br>
<dl>
<dd>There is at least one company (nameless at this point, but
not SMA)
that<br>
</dd>
<dd>has been providing replacements for swapping out faulty
arc
fault<br>
</dd>
<dd>detectors in their inverters. Could it be possible you
have a
bad<br>
</dd>
<dd>detector?<br>
<br>
</dd>
<dd>Daryl<br>
<br>
<br>
<br>
</dd>
<dd>> Hi All,<br>
</dd>
<dd>><br>
</dd>
<dd>> Maybe someone will have some ideas for why a couple
inverters
keep arc<br>
</dd>
<dd>> faulting:<br>
</dd>
<dd>><br>
</dd>
<dd>> -There are two SB7000TL-22 inverters, Sunpower
branded.<br>
</dd>
<dd>> -3 Strings of 7 SPR-327's to each inverter. Kept
separate until
the<br>
</dd>
<dd>> inverter.<br>
</dd>
<dd>> -Ground mount about 50' from the shed where the
inverters are
located<br>
</dd>
<dd>> (indoors)<br>
</dd>
<dd>> -Simple grid connected system, no batteries.<br>
</dd>
<dd>> -There is a whole house generator co-located in the
shed.<br>
</dd>
<dd>> -We interconnect by using piercing taps on the line
side of the
generator<br>
</dd>
<dd>> transfer switch<br>
</dd>
<dd>> -There has been only one power outage there since the
system was
installed<br>
</dd>
<dd>> in April, but the generator fires up weekly.<br>
</dd>
<dd>><br>
</dd>
<dd>> -The arc faults have been happening on both
inverters. Sometimes
only one<br>
</dd>
<dd>> at a time, sometimes both will go within a day of
each
other.<br>
</dd>
<dd>> -The events have been approximately one a month, but
sometimes
more,<br>
</dd>
<dd>> sometimes less.<br>
</dd>
<dd>><br>
</dd>
<dd>> -We have already checked every single connection in
the system
twice, by<br>
</dd>
<dd>> two different people.<br>
</dd>
<dd>> -We have replaced the underground wires (and they
looked just
fine)<br>
</dd>
<dd>> -We have replaced all home runs.<br>
</dd>
<dd>> -We have replaced both inverters.<br>
</dd>
<dd>> -Arc faults are still happening.<br>
</dd>
<dd>> -Arc faults are not always on the same day/time of
the
week.<br>
</dd>
<dd>><br>
</dd>
<dd>> I am wondering if this can be caused by the
generator?<br>
</dd>
<dd>> Has anyone run into a situation like this or
something
similar?<br>
</dd>
<dd>><br>
</dd>
<dd>> Thanks for your help,<br>
</dd>
<dd>> Dave<br>
</dd>
<dd>><br>
</dd>
<dd>> *--*<br>
</dd>
<dd>><br>
</dd>
<dd>><br>
</dd>
<dd>> *Dave Tedeyan*<br>
</dd>
<dd>> *Project Engineer*<br>
</dd>
<dd>><br>
</dd>
<dd>> *Taitem Engineering, PC*<br>
</dd>
<dd>> 109 S. Albany Street, Ithaca, NY 14850<br>
</dd>
<dd>> Voice: <a moz-do-not-send="true"
href="tel:%28607%29%20277-1118%20x121">(607) 277-1118
x121</a><br>
</dd>
<dd>> <a moz-do-not-send="true"
href="http://www.taitem.com">www.taitem.com</a><br>
</dd>
<dd>> _______________________________________________<br>
</dd>
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