Hi James, Is the solectria combiner actually combining strings so you have one input into the SMA inverter? If so, did SMA approve arc fault detection at that high current? From what I understand, arc fault detection doesn't work on strings greater than 20A.
In the solectria box, I'm assuming there is a contactor in there, correct? Do you have coils of wire inside from the power supply to the contactor? I have seen instances where coiled wire was generated the noise itself. Is the wire from the power supply to the contactor shielded? From: James Rudolph <jamesrudolp...@gmail.com> > > > Aloha Wrenches, > > I have a issue I would like to throw at the group. > > We have a SMA 24000TL-US with a Solectria Rapid Shut Down Combiner. > The inverter keeps faulting the AFCI. We megged the strings,and checked all > connections on all components. So we are confident that the issue is not > related, or connected to all of that. We also swapped out the RSB. > > I really can't disclose where the building is located because its military, > and most of their IT infrastructure happens to be in this building as well. > > I know from research, and tech support that this happens sometimes with RF > signals,metal roofs,and communications antennas,etc. > > SMA is suggesting we could re-run the stings so that we mitigate the > possibility that the strings are picking up this noise and triggering the > AFCI, or get clearance to disable that feature on the inverter. > > Due to safety issues I'm sure the last option is not on the table. > > We can also place any given sting on the combiner and it will work fine > with no faults up to four stings. Once we place more than four strings on > the combiner the inverter will fault. > > Since we are still on the 2008 NEC in Hawaii this is our first run in with > the Rapid Shut Downs too. Maybe somehow this is tied into the issue? > > Anyone have thoughts, or experience with this type of issue? > > > Mahalo Nui, > > > *James B. Rudolph* > > *Hawaii Unifed* > > *Director of Energy* > > *ES Electrician # 10816* > > *NABCEP Certified PV Installer # 091209-155* > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re- > wrenches.org/attachments/20180124/455d31c5/attachment-0001.html> >
_______________________________________________ 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
