Howie, Yes, we have actually already replaced both inverters on site and the issues are still happening. At this point I doubt that we could have gotten 4 units with faulty arc fault sensors...
Drake, I am beginning to think that it may be some noise from the utility. Would you know of a way to test for this? eGague unit maybe? Cheers, Dave *--* *Dave Tedeyan* *Project Engineer* *Taitem Engineering, PC* 109 S. Albany Street, Ithaca, NY 14850 Voice: (607) 277-1118 x121 www.taitem.com On Fri, Nov 11, 2016 at 10:15 AM, Drake < drake.chamber...@redwoodalliance.org> wrote: > Electrical noise coming in from the utility side can also cause an arc > fault code. > > At 07:32 AM 11/11/2016, you wrote: > > This array is a ground mount, so not on a roof, and no radio towers nearby. > > As for grounding, The array and the shed with the interconnection point > are in the same area. > There are a couple ground rods there, which everything on the AC side is > connected to, > including a #6 wire from each inverter. there is just a #10 ground coming > from the array to the inverters. > The house is a couple hundred feet away and has its own grounding > electrode system. > > Jerry, > The inverters are new (replaced 2 months ago), but it is a good idea to > check firmware. > As for AC loads, nothing stands out as the types of things you mentioned, > although there > may be a well pump. They also do have a large water storage tank for > heating, but they > say that they have not needed to use it yet this year. Then there is also > the generator... > > Thanks for your recommendations. > -Dave > > > > > > *-- Dave Tedeyan* > Project Engineer > > > *Taitem Engineering, PC *109 S. Albany Street, Ithaca, NY 14850 > Voice: (607) 277-1118 x121 <http://??> > www.taitem.com > > On Thu, Nov 10, 2016 at 9:51 PM, Jerry Shafer <jerrysgarag...@gmail.com > > wrote: > Dave. > 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. > Jerry > > On Thu, Nov 10, 2016 at 8:14 AM, Dave Tedeyan <dtede...@taitem.com> wrote: > 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. 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