[RE-wrenches] Insulation Resistance Testing with Klein ET600

[Jason Szumlanski]

That's a good point. I didn't install this system, but I know for certain
the PV EGC is not landed in either of the dual Sol-Ark inverters. It must
be landed on a grounding terminal in a wiring trough or load center. I'll
have to track that down. I'm not sure how the GE system is installed,
either.


Jason Szumlanski
Principal Solar Designer | Florida Solar Design Group
NABCEP Certified Solar Professional (PVIP)
Florida State Certified Solar Contractor CVC56956
Florida Certified Electrical Contractor EC13013208


On Sun, Apr 6, 2025 at 11:03 AM david quattro <david at quattrosolar.com>
wrote:

> 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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