[RE-wrenches] SolarEdge inverter blowing fuses

[Jerry Shafer]

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
>
>
>
>
> _______________________________________________
> List sponsored by Redwood Alliance
>
> Pay optional member dues here: http://re-wrenches.org
>
> List Address: RE-wrenches at 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
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches_lists.re-wrenches.org/attachments/20211101/00ce1f50/attachment.htm>