It is always the left fuse! Thanks all for the pointers. I'll double check the monitoring, but am thinking that I will be replacing the switch with a SQD, and replacing the taps and AC wires as well while I'm at it. Cheers, Dave
On Mon, Nov 1, 2021, 9:13 PM Jerry Shafer <jerrysgarag...@gmail.com> wrote: > 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. 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