Can you swap the strings in each inverter? Then you'll know whether the issue truly lies in the inverter or the array.
Cheers, Dave On Sun, Apr 6, 2025, 1:35 PM Jason Szumlanski via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > I should mention that the other inverter also has three strings and is > experiencing no faults. Neither inverter has an EGC landed in it from the > array. > > > Jason Szumlanski > > > On Sun, Apr 6, 2025, 11:47 AM david quattro <da...@quattrosolar.com> > wrote: > >> Tech support said if it’s landed in conjunction with the Load Out ground >> it causes an ‘echo’ on the grounds. Can result in erroneous Arc fault or >> other error codes. >> I think if using a separate wire trough, that trough needs to be >> physically far from the inverter and close to an electrode. >> >> >> >> On Sun, Apr 6, 2025 at 8:09 AM Jason Szumlanski < >> ja...@floridasolardesigngroup.com> wrote: >> >>> That's a good point. I didn't install this system, but I know for >>> certain the PV EGC is not landed in either of the dual Sol-Ark inverters. >>> It must be landed on a grounding terminal in a wiring trough or load >>> center. I'll have to track that down. I'm not sure how the GE system is >>> installed, either. >>> >>> >>> Jason Szumlanski >>> Principal Solar Designer | Florida Solar Design Group >>> NABCEP Certified Solar Professional (PVIP) >>> Florida State Certified Solar Contractor CVC56956 >>> Florida Certified Electrical Contractor EC13013208 >>> >>> >>> On Sun, Apr 6, 2025 at 11:03 AM david quattro <da...@quattrosolar.com> >>> wrote: >>> >>>> Hi Jason, >>>> SolArk tech support has told us to land the PV equipment ground >>>> directly to an electrode. ie do not land the PV ground in the >>>> inverter’s built in ground-bar. This detail wasn’t in their manuals years >>>> ago. I hope this is helpful 🤙🏼 >>>> David >>>> >>>> >>>> >>>> On Sun, Apr 6, 2025 at 7:19 AM Jason Szumlanski via RE-wrenches < >>>> re-wrenches@lists.re-wrenches.org> wrote: >>>> >>>>> If anyone is using this tester to do insulation resistance testing, I >>>>> would appreciate any pointers you have. >>>>> >>>>> I have used it successfully to test home run DC strings from >>>>> rooftop junction boxes to inverters to check for nicks in wires and hard >>>>> faults to ground or short circuits. However, I am currently facing a >>>>> Sol-Ark 15K with three strings of PV that all seem to cause an >>>>> intermittent >>>>> DC insulation fault (F24). I have isolated each string by disconnecting >>>>> the >>>>> other strings at the rooftop junction box. With only one string connected >>>>> to the inverter, regardless of which string it is, I will eventually get >>>>> the F24 error. >>>>> >>>>> Since I have ruled out the home run wiring, It appears the issue must >>>>> be within the array somewhere. I would like to use the ET600 to help track >>>>> it down, but I am reading conflicting information on how to properly >>>>> undertake the test on each string. I know that I can disconnect the >>>>> conductors between each PV string and the junction box and test each >>>>> jumper >>>>> wire individually while disconnected. But what about the PV module leads >>>>> within the string of connected modules? I'm suspecting a pinched PV module >>>>> lead somewhere, but I don't know where to start looking. >>>>> >>>>> Jason Szumlanski >>>>> Florida Solar Design Group >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> List sponsored by Redwood Alliance >>>>> >>>>> Pay optional member dues here: http://re-wrenches.org >>>>> >>>>> 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 >>>>> >>>>> There are two list archives for searching. When one doesn't work, try >>>>> the other: >>>>> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >>>>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>>>> >>>>> List rules & etiquette: >>>>> http://www.re-wrenches.org/etiquette.htm >>>>> >>>>> Check out or update participant bios: >>>>> http://www.members.re-wrenches.org >>>>> >>>>> _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > 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 > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > >
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