We had an installation with 3, 7 let SMA's we did the same checks you did. We found a AC contactor that was causing the problem, SMA agrees that this can happen. Just a thought Jerry On Jun 18, 2015 4:31 AM, "Glenn Burt" <[email protected]> wrote:
> Have you performed insulation resistance tests on the DC conductors > (megger)? > > Sincerely, > Glenn Burt > Sent from my 'smart' phone so please excuse grammar and typos. > ------------------------------ > From: Howard Scot Arey <[email protected]> > Sent: 6/18/2015 8:30 > To: [email protected] > Subject: [RE-wrenches] Repetitive and unknown arc-fault codes with this > combination...Sunpreme bi-facial and Fronius IG > > 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 > > [email protected] > > > > [image: logo from letterhead] > > > > [The entire original message is not included.] > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/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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