[RE-wrenches] Tigo TS4-A-F

[William Miller]

Christopher:

Thank you.

How is it that one can put optimized inverters in front of a standard MPPT
algorithm?  Don’t they work against each other?


William Miller
Miller Solar.com
805-438-5600
www.millersolar.com


On Tue, Nov 18, 2025 at 5:47 AM Christopher Warfel via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> I recently got the TS4 A-Os when I thought I ordered the TS A Fs and was
> also worried about the possible fighting between the two MPPT devices.  As
> was under the gun for weather and end of year, went with the AO's. Have you
> tried emailing "support at tigoenergy.com" <support at tigoenergy.com>?
>
> I went through AI and found this document:
>
>
>
> On 11/17/2025 11:44 PM, MDElectricSolar via RE-wrenches wrote:
>
> We are having no issues sourcing these from our primary vendor, Greentech.
>
> Michael D Nelson
> MD Electric & Solar, Inc.
> 707-684-0064 mobile
> 707-884-1862 office
> www.mdelectricsolar.com
> www.facebook.com/mdelectricandsolar
>
>
> On Nov 17, 2025, at 7:11 PM, William Miller via RE-wrenches
> <re-wrenches at lists.re-wrenches.org> <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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> --
> Christopher Warfel, PE
> ENTECH Engineering, Inc.
> PO Box 871, Block Island, RI 02807
> (401) 447-5773
>
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