Have you tried to isolate the inverters & / or each of the PV strings , shut 1 down disconnecting any DC source and see if you get your fault code. I am assuming that you are getting the same fault code for both inverters, correct? There are no communication cabling between the inverters. I would begin by isolating each string one at a time. yes this can be quite time consuming if this fault is not occurring immediately. both DCSC, (source circuits) are they run inside the same conduit from array, then breaking out to their respective inverters? Isolate isolate isolate! On Jun 18, 2015, at 8:30 AM, Howard Scot Arey wrote:
> I need some help please! I’m quickly losing credibility with two of my > customers. > > We have two installations with Sunpreme GxB 350 bi-facial modules and Fronius > IG inverters. They keep throwing Error code 240 – arc fault on the Fronius > IG. > > We’ve been up and down these installation three times checking connections, > replacing connectors, tightening connections, checking for chafed wires. > Nothing to cause any visible angst. > > The team here is wondering is perhaps the module itself might be the source > of the problem, with some DC arcing inside the J-Box. Any thoughts? We > can’t open the j-box on an broken module (be careful handling frameless glass > on glass modules J) because there doesn’t appear to anything accessible with > modern potted j-boxes. > > As for the conditions when we get these arc fault codes – typically the peak > of a sunny day when they’re making max power. > > Each of the installations is a bit different. On the 7KW install with Fronius > 7.5, we’ve run the two strings (10 modules each) back to the inverter > separately. On the 10.5KW install with the Fronius 10.0, we ran 3 strings of > 10 to a combiner box, then one set of conductor back to the Fronius 10.0 > where we used the distribution plate to spead the amperage across the six > string input channels. > > I’m stuck – any thoughts on other potential arc-fault causes? > > Howard “Scot” Arey > 254-300-1228 > scot.a...@solarcentex.com > > <image001.jpg> > > _______________________________________________ > 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 > t...@swnl.net www.SWNL.net > Solarwinds Northernlights > Serving Mid Coast Maine & Northern California > 207-832-7574 Cl. 610-517-8401 > > Blair "TUMP" May > ******** MAINE'S CHARTER ******** > NABCEP "Certified PV Installer" > > ******** MAINE'S CHARTER ******** > Trace Xantrex "Certified" Dealer / Installer" >
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