[RE-wrenches] Tigo TS4-A-F

[Howie Michaelson]

I can not determine if RSD is still required for PV mounted on
non-enclosed structures if the DC conductors are brought into a dwelling
where the inverter is located? This is an important consideration when
installing batteries in cold country.

Howie Michaelson


On Wed, Nov 19, 2025 at 3:06 PM jay via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Hi Zeke,
>
> you are correct in regards to parking structures.
> See the following
> 2023 NEC
>
> 690.12
> exemption #2
>
>
> On Nov 19, 2025, at 12:40 PM, Zeke Yewdall via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
> Yes, you are right -- even a non occupied garage or shed would be required
> to have it if it's not solely for the PV system under exception #1.  But I
> was thinking of Exception #2: PV equipment and circuits installed on
> nonenclosed detached structures including but not limited to parking shade
> structures, carports, solar trellises, and similar structures shall not be
> required to comply with 690.12.  That seems to pretty clearly cover
> ground mounts.
>
> Also we have the exception that conductors originating from arrays not
> attached to buildings, that terminate on the exterior of buildings don't
> need to be considered as controlled conductors.  If they're going into an
> inverter inside a building but the PV array is not on the building, does an
> external accessible DC disconnect count as ending those conductors, and the
> output from the disconnect is no longer a controlled conductor either?
>
> Zeke
>
> On Wed, Nov 19, 2025 at 8:24 AM William Miller <william at millersolar.com>
> wrote:
>
>> To paraphrase:  If PV circuits are located on or in any structure RSS is
>> required. Exception: if the structure’s sole purpose is to house solar
>> equipment then RSS is not required.
>>
>> If your inverter is in a shed and there is one rake in that shed, RSS is
>> required.
>>
>>
>> William Miller
>> Miller Solar.com
>> 805-438-5600
>> www.millersolar.com
>>
>>
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