[RE-wrenches] Tigo TS4-A-F

[Nick Lucchese]

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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