[RE-wrenches] Tigo TS4-A-F

Tue Nov 18 10:44:47 PST 2025

I meant to write: “optimized PV in front of MPPT inputs,” but I think you
know what I meant.

Let us know how it goes.

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

On Tue, Nov 18, 2025 at 9:49 AM Christopher Warfel <
cwarfel at entech-engineering.com> wrote:

> I would have thought so.  I can just see them saying tweak this, no tweak
> that.  But I going to have to assume their statement is valid.  I hope to
> fire it up in the next week.  My first EG4 so I need to learn how to
> commission this first.
> On 11/18/2025 10:55 AM, William Miller wrote:
>
> 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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>> --
> Christopher Warfel, PE
> ENTECH Engineering, Inc.
> PO Box 871, Block Island, RI 02807
> (401) 447-5773
>
>
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