[RE-wrenches] SolarEdge inverter blowing fuses

[Jason Szumlanski]

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 <
jason at 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 <
> jason at 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 <dave at 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
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