You can use a Fluke 435 series, it will reveal any harmonics and record the energy levels for each harmonic. It has a scope feature. You can rent one pretty cheaply and record 24 hours of data. I can send you a sample report from mine if you want.
On Sun, Nov 13, 2016 at 9:36 PM, Dave Tedeyan <dtede...@taitem.com> wrote: > 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.chamberlin@ > 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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