Wrenches Cant tell anymore but l had a buss failure due to water getting on buss and pealing the tin off the buss and the aluminum base will light up real quick. Jerry
On Tue, Jan 21, 2020, 9:10 AM Jason Szumlanski < ja...@floridasolardesigngroup.com> wrote: > (System installed by another contractor...) > > I have been tasked with assisting in the investigation of damage in a > subpanel used to combine inverter output circuits (5 strings of > microinverters). There appears to be no damage to conductors or other > system components. It looks like the damage started at the stabs of the bus > bar where the breakers connect. Picture attached. Here are a few clues: > > - Monitoring indicates that damage occurred overnight a few weeks ago. > That night we had rain as a winter front came through Florida, possibly > lightning. The prior day everything was fine. > - The next morning, only 2 of 5 strings started producing power, but 4 > of 5 strings were reporting data to the Envoy. The two strings that were > reporting but not producing power reported 0Vac and Voc on the DC side of > the microinverters. > - A couple of weeks later, 1 of the 2 strings that was producing power > quit doing so, but continued reporting data. > - Customer discovered damage yesterday. > - About a week before the initial damage apparently manifested itself, > another contractor installed a whole house generator transfer switch on the > line side of the PV interconnection. The generator has never been run > (there is not even a LP fuel source on site yet). I pointed out that the > solar interconnection, which was previously on the supply side, would need > to be moved to the supply side of the generator transfer switch's main > breaker before operation. During the transfer switch installation, the > contractor also switched line 1 and line 2, but that shouldn't > really matter, except for Enphase consumption monitoring, which was messed > up by the swapping of the lines. > > So I'm looking for ideas. I'm wondering if the OCPD would be a likely > place for lightning damage to manifest itself. I can't visually detect any > other damage anywhere else. I can't imagine that the transfer switch > installation would have anything to do with it, but the timing is > interesting. Other than replacing the subpanel and OCPD and firing it back > up (no pun intended), I'm not sure how to approach further investigation. > > Jason Szumlanski > Florida Solar Design Group > > > _______________________________________________ > 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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