[RE-wrenches] Cell damage leading to ground fault?

[Kirk Herander]

Inspectors in my area require the conduit terminations be packed with duct
seal for this reason to avoid condensation build up in j boxes.

Every intermittent insulation/isolation test failure I’ve ever meggered and
resolved has been the result of moisture, either condensation or heavy rain
permeating a termination enclosure, or a defective panel admitting moisture.

*Kirk Herander / **kirkh at vermont.solar <kirkh at vermont.solar>*

*Owner|Principal, VT Solar, LLC*

*Celebrating our 34st Anniversary 1991-2025!!*

dba Vermont Solar Engineering

802.559.1225


On Thu, May 8, 2025 at 3:57 PM david quattro via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Fronius install manual says the conduit entry ports need to be packed with
> putty around the wires. They’re the only manufacturer I know of that
> requires this. Water vapor roses into the circuit boards.    I used to get
> a couple different error codes until we packed the conduits.
>    Good luck, and let us know!
>
>
>
> On Thu, May 8, 2025 at 12:22 PM Dave Tedeyan via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> Hello,
>>
>> There is an installation that I am servicing with the Q.Peak G4 modules,
>> where one cell has some visible damage. I am wondering whether this type
>> damage can lead to a ground fault? The Fronius inverter on site is
>> picking up an "Insulation Resist" error. I am wondering whether this could
>> be the cause, or whether I should look elsewhere in the array. A photo is
>> attached. Any thoughts would be appreciated.
>>
>> Thanks!
>> Dave
>>
>> --
>>
>> [image: Logo] <https://www.sungineersolar.com/>
>> Dave Tedeyan, P.E.
>> Owner | Sungineer Solar
>> p: he | him | his
>> a: 1653 Slaterville Rd.
>> <https://www.google.com/maps/search/1653+Slaterville+Rd.+%C2%A0+%7C%C2%A0Ithaca,+NY+14850?entry=gmail&source=g>
>>
>> <https://www.google.com/maps/search/1653+Slaterville+Rd.+%C2%A0+%7C%C2%A0Ithaca,+NY+14850?entry=gmail&source=g>| Ithaca,
>> NY 14850
>> <https://www.google.com/maps/search/1653+Slaterville+Rd.+%C2%A0+%7C%C2%A0Ithaca,+NY+14850?entry=gmail&source=g>
>> w: www.sungineersolar.com <http://www.sungineersolar.com/>
>> c:
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>> 270-0370
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