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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