[RE-wrenches] Insulation Resistance Testing with Klein ET600

[david quattro]

Hi Jason,
   SolArk tech support has told us to land the PV equipment ground directly
to an electrode. ie do not land the PV ground in the inverter’s built in
ground-bar. This detail wasn’t in their manuals years ago. I hope this is
helpful 🤙🏼
David



On Sun, Apr 6, 2025 at 7:19 AM Jason Szumlanski via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> If anyone is using this tester to do insulation resistance testing, I
> would appreciate any pointers you have.
>
> I have used it successfully to test home run DC strings from
> rooftop junction boxes to inverters to check for nicks in wires and hard
> faults to ground or short circuits. However, I am currently facing a
> Sol-Ark 15K with three strings of PV that all seem to cause an intermittent
> DC insulation fault (F24). I have isolated each string by disconnecting the
> other strings at the rooftop junction box. With only one string connected
> to the inverter, regardless of which string it is, I will eventually get
> the F24 error.
>
> Since I have ruled out the home run wiring, It appears the issue must be
> within the array somewhere. I would like to use the ET600 to help track it
> down, but I am reading conflicting information on how to properly undertake
> the test on each string. I know that I can disconnect the conductors
> between each PV string and the junction box and test each jumper wire
> individually while disconnected. But what about the PV module leads
> within the string of connected modules? I'm suspecting a pinched PV module
> lead somewhere, but I don't know where to start looking.
>
> Jason Szumlanski
> Florida Solar Design Group
>
>
>
>
>
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