[RE-wrenches] SMA TL-22 insulation resistance error

[August Goers]

You might want to make sure that the SMA inverter has the latest firmware.
It's been a long time since we've routinely installed these, but at one
point arc faults were being falsely tripped and firmware updates from SMA
helped with the issue.

https://my.sma-service.com/s/article/Loading-Firmware-for-an-SB-US-TL22-or-STP-US-10-using-a-2-GB-SD-Card?language=en_US

August
Luminalt


On Wed, Dec 13, 2023 at 9:07 AM Jay via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> I think that using a megger etc to test the panels and wires is what I’d
> do before I yanked out  all the
> Wires.
>
> They are not that expensive anymore and maybe possible to rent one?
>
> Jay
>
> On Dec 13, 2023, at 8:53 AM, Dave Tedeyan via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
> 
> Hi All,
>
> I am curious to hear if anyone else has run into this:
>
> This is the system I posted about a little while ago that had the
> SolarWorld modules and all the module to module connectors were swollen and
> melted. One of the inverters was giving an insulation resistance error, and
> so after seeing the module connectors, I was sure that was the issue. We
> replaced every single module connector with new MC4's, and then the error
> came back!
>
> My next step was to swap in the junction box which strings go to which
> inverter to identify whether the issue was on the roof or somewhere between
> the roof jbox and the inverter. (the issue was isolated to only 1 of 4
> strings previously). Turns out the same inverter is faulting, which leads
> me to believe that there may be an issue with the wires in the DC conduit.
> Maybe they got damaged by a rough wire pull at the initial installation 7
> years ago, and its finally degraded enough to cause a problem. The fault is
> intermittent, only showing up once every couple weeks or so, so it is
> difficult to catch it while the fault is active.
>
> But my question is, could there also be something wrong with the inverter
> itself? After spending a lot of time on this one, ideally, I would know
> that replacing the DC wires will fix it. So I am curious if people have
> done this, to still find that the issue was something internal to the
> inverter.
>
> Thanks!
> -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) 270-0370
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