I should also mention that it has nothing to do with ambient heat. This has occured in all seasons and with disconnects in direct sunlight on a south wall and disconnects in air conditioned garages.
It's just a garbage product. We switched to Square D for 60A D222NRB fusible disconnects and are also using their 100A circuit breaker enclosures which are cost effective. The D223NRB is also a good fusible disconnect, but pricey. Jason On Mon, Nov 1, 2021, 8:24 PM Jason Szumlanski < ja...@floridasolardesigngroup.com> wrote: > It's the disconnect. We had dozens of this subpar disconnect design fail > on Enphase systems. The 2 Pole has the same issue. > > GE gave us some nonsense answer that it's General Duty and not designed > for continuous high power. Even 40A combined Enphase systems will blow a > 60A fuse. > > What you will find is the fuse will blow on one side and then replacements > will blow at decreasing intervals until it blows daily. Our experience is > the left side (of the 2-pole) is far more problematic for some odd reason. > It's not the fuse brand either. > > I believe the design fault is how the blades only hit a single contact on > one side when they close. The Square D alternative has the blade slipping > between two contacts. > > Sadly we have had to replace so many of these and most are supply side > interconnections, which make it tricky and expensive. > > Jason Szumlanski > Florida Solar Design Group > > > > > On Mon, Nov 1, 2021, 4:26 PM Dave Tedeyan <d...@sungineersolar.com> wrote: > >> Hi All, >> >> I am servicing a system that keeps blowing fuses on the AC side, although >> it >> appears that everything is sized correctly. It is a SolarEdge >> SE11400A-US inverter. >> Max continuous output current is 47.5A x 1.25 = 59.4A. There is a GE >> TG3222R >> 60A AC disconnect, and it is wired up with #6 THHN wire. The terminals >> were tight >> and there was no evidence of arcing or burning in the past. This is >> indoors, and not >> exposed to sunlight. No extra conductors are in the conduit. >> >> But they say that they need to replace a fuse roughly once per month. Has >> anyone >> seen this before? Could there be some kind of fault in the inverter >> itself that >> occasionally induces extra current? Is there any way to tweak the >> settings so that it >> actually produces a bit more than 11.4kw? I appreciate your thoughts. >> >> Cheers, >> Dave >> >> -- >> [image: Logo] <https://www.sungineersolar.com/> >> Dave Tedeyan, P.E. >> Owner | Sungineer Solar >> p: he | him | his >> a: 1653 Slaterville Rd. | Ithaca, NY 14850 >> w: www.sungineersolar.com <http://www.sungineersolar.com/> >> c: (607) 288-2898 >> _______________________________________________ >> 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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