Bad switch
On Mon, Nov 1, 2021 at 5:44 PM Jason Szumlanski < ja...@floridasolardesigngroup.com> wrote: > See attached image. Notice the discoloration on the top of the left fuse. > It's always the same thing, same place. > > Jason > > On Mon, Nov 1, 2021, 8:30 PM Jason Szumlanski < > ja...@floridasolardesigngroup.com> wrote: > >> 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 >>>> >>>> _______________________________________________ > 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 > >
_______________________________________________ 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
