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 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. Albany Street, Ithaca, NY 14850 >> Voice: (607) 277-1118 x121 >> www.taitem.com >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: http://www.mail-archive.com/re >> -wrenc...@lists.re-wrenches.org/maillist.html >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> >> >> > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches. > org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > >
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