[RE-wrenches] Tigo TS4-A-F

[Tyrone Houck]

Has anybody had any failures of APSmart RSD-S-PLC's? I asked this before
and got no responses. I have had no issues myself and they seem consistent
and straightforward.




On Thu, Nov 20, 2025, 9:06 AM David Buckner via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Evidence of failures and related issues
>
>    - Overheating and fire: Multiple sources, including court documents,
>    describe Tigo RSDs that showed signs of extreme overheating, melting, or
>    being completely incinerated.
>    - Legal action: A lawsuit was filed against Tigo Energy alleging their
>    RSDs posed a clear threat of death, injury, and property damage, with
>    plaintiffs shutting down their own systems as a result.
>
> Systemic problems: Some reports suggest that failures are not isolated,
> with multiple devices failing across different projects.
>
>    - Allegations of a cover-up: The aforementioned lawsuit includes
>    claims that Tigo was aware of risks and failed to adequately warn
>    customers, suggesting a cover-up was in progress, *notes Courthouse
>    News
>    <https://www.courthousenews.com/wp-content/uploads/2024/11/2024-29-3-13-14-13-2fb45a16-f38b-4ab2-bfe6-c4ba492b4ab4-2.pdf>*
>    .
>
>
> ------------------------------
> *From:* David Buckner <dbuckner at solaresystems.com>
> *Sent:* Thursday, November 20, 2025 11:32 AM
> *To:* william at millersolar.com <william at millersolar.com>; RE-wrenches <
> re-wrenches at lists.re-wrenches.org>
> *Cc:* Nick Lucchese <lucchesesolar at gmail.com>
> *Subject:* Re: [RE-wrenches] Tigo TS4-A-F
>
> We have a multitude of these same issues with the TS40-A-F.  We followed
> every new guideline from Tigo in order to avoid corrupted signals but still
> had issues.  After a hot breezy day in NJ last year caused a Tigo failure
> to spread the roof caught on fire and caused millions in damage.
> Thankfully no one was injured.  We spent the rest of 2024 pulling 6 MW's of
> Tigos off of other roofs for this customer.  I have heard multiple stories
> of similar issues for many very experienced installers.
>
> David Buckner
> SES
>
>
> ------------------------------
> *From:* RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> on behalf
> of Nick Lucchese via RE-wrenches <re-wrenches at lists.re-wrenches.org>
> *Sent:* Wednesday, November 19, 2025 12:11 PM
> *To:* william at millersolar.com <william at millersolar.com>; RE-wrenches <
> re-wrenches at lists.re-wrenches.org>
> *Cc:* Nick Lucchese <lucchesesolar at gmail.com>
> *Subject:* Re: [RE-wrenches] Tigo TS4-A-F
>
> CAUTION: External Email.
> Appears that Zonna still has quite a few in stock. Feeling foolish to
> purchase more after having a TS4-2F fail into a pile of molten plastic and
> ruin a 405 watt bifacial module that I can no longer find a replacement
> for. What other options do we have for small DC coupled arrays on
> residential rooftops though? Not the most inspiring times to be installing
> rooftop PV. Hopefully I'll start having better luck with the single module
> units. Numerous times I've had units become bricked and not pass module
> voltage but this is the first time I've had this type of catastrophic
> failure that also inconveniently cost me the module.
>
> Nick
>
>
>
>
> On Mon, Nov 17, 2025 at 7:10 PM William Miller via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
> Friends:
>
>
>
> I am having trouble locating these RSDs.  Very few vendors appear to have
> these and I can’t get any to call back and verify they have them.  I can’t
> get Tigo to return my calls.  Does anyone know if these are discontinued?
>
>
>
> What are the rest of you doing for rapid shutdown?  I don’t trust Alps:  I
> have heard too many horror stories.  It seems the form factor is too small
> to contain arc suppression measures.
>
>
>
> Somewhere I saw as an alternative the Tigo TS4-A-O.  These are
> optimizers.  I worry these will fight with the MPPT algorithm in the
> inverter or charge controller.  There is also the TS4-A-S which has
> shutdown and monitoring.
>
>
>
> All input is welcome an appreciated.  Thanks in advance.
>
>
>
> William
>
>
>
> Miller Solar
>
> 17395 Oak Road, Atascadero, CA 93422
>
> 805-438-5600
>
> www.millersolar.com
>
> CA Lic. 773985
>
>
>
>
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