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