[RE-wrenches] SolarEdge inverter blowing fuses

[Dave Tedeyan]

The fuses are Ferraz Shawmut Trionic TR60R. 60A, 250V. I looked them up to
find that they are time delay, RK5 type.

I would imagine that there is monitoring, but not being my installation, I
don't have access to it. That's a good idea though to get access to see
when this is happening.

I am also waiting to hear back as to whether it is both legs, or only one.
I've been to the site only once so far, to initially diagnose the bad fuse.
At the time, I was hoping that it was just a bad fuse since everything else
looked okay.

Lloyd, thanks for the insulation tip. Next time I head out there, I should
pull out the wires and take a closer look. Unfortunately it's a line side
tap, so I'm not excited about removing the tap, but may be worth it if I
can't find anything else. Although come to think of it, I did find a ground
fault in the wires for another system at the same site, so the original
installers' wire pulling technique is certainly suspect.

Cheers,
Dave

On Mon, Nov 1, 2021, 6:05 PM Jerry Shafer <jerrysgarage01 at gmail.com> wrote:

> Does this system have monitoring, what time of day is this happening, the
> monitoring site should show output at time of failure, what leg is tripping
> both or one side? You may want to look at the fuses they are using, rapid
> blow, slow blow, rated for the duty these are being used for. You can also
> use a data logger to get a better idea of what and when
>
> Jerry
>
> On Mon, Nov 1, 2021, 1:45 PM Lloyd Hoffstatter <
> lloyd at sunstruckconsulting.com> wrote:
>
>> Dave,
>>
>>
>>
>> My first thought would be a small nick in wire insulation going to
>> ground, causing the fuse to fail over time.
>>
>> We had a similar situation with a much larger system where the culprit
>> was hard to notice…
>>
>>
>>
>> Best regards,
>>
>> Lloyd
>>
>>
>>
>> Lloyd Hoffstatter
>>
>> Sunstruck Consulting
>>
>>
>>
>> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
>> Windows
>>
>>
>>
>> *From: *Dave Tedeyan <dave at sungineersolar.com>
>> *Sent: *Monday, November 1, 2021 4:26 PM
>> *To: *RE-wrenches <re-wrenches at lists.re-wrenches.org>
>> *Subject: *[RE-wrenches] SolarEdge inverter blowing fuses
>>
>>
>>
>> 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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