Hi Stuart,

Got it, now I see you're working with the MidNite AIO. This ATS topic came
up not too long ago and I posted that we used to have success with Briggs &
Stratton ATS units back when we were installing SMA Sunny Island systems.
The Briggs unit does not need a control from an external source, it just
switches over automatically (with a few second delay) once utility power is
lost. We never had a single problem with these transfer switches.

You might check them out:
https://www.nationwidegenerators.com/briggs-stratton-071270-200-amp-se-rated-120-240v-1ph-ats/?srsltid=AfmBOorCds2ktOcsHUf3GWmX5ba70K-ynjOcm1iizzIW6X-9OkSVpfHA

I know that Briggs went through a bankruptcy a few years ago, but maybe
they're still alive and kicking now.

August


On Tue, Jan 14, 2025 at 1:29 PM Stuart Kriendler <stuartkriend...@gmail.com>
wrote:

> Much appreciated August,
>
> Yes, that fancy Enphase System Controller is a nice piece of kit, overseen
> a few of those and it is nice they pass through the grid power if there is
> an issue, most of the time.
> ;-)
> I'm in love with the MN AIO, the build quality is impressive and great
> value for money, with the CBI breakers and features mentioned earlier etc.
> all built in.
> Now seen an engineering sample do the business in an rugged off-grid
> scenario for a few months and feel confident it will be a great GT hybrid
> option, one catch is the need for a 3rd party ATS though.
> (Hoping Midnite will make one of their own in time, as well as a wireway
> to marry the PowerFlo 16 and AIO, both such nicely built solid equipment).
>
> Hopefully the Kohler RXT or Generac can work to keep the ATS cost below
> $1k!
>
> Sunniest regards,
> Stuart
> 441 599 2105
>
>
> On Tue, 14 Jan 2025 at 16:02, August Goers <aug...@luminalt.com> wrote:
>
>> Hi Stuart -
>>
>> Many grid tied PV/ESS manufacturers (Enphase, SolarEdge, Franklin, Tesla
>> to name a few) now have a Microgrid Interconnect Device (MID) that
>> essentially acts as a smart transfer switch thus eliminating the need for a
>> 3rd party automatic transfer switch. What brands equipment are you looking
>> at?
>>
>> Best, August
>>
>> On Tue, Jan 14, 2025 at 11:10 AM Stuart Kriendler via RE-wrenches <
>> re-wrenches@lists.re-wrenches.org> wrote:
>>
>>> Good day Wrenches,
>>>
>>> 2025 looks to be the year for installing more grid tied (GT) battery
>>> back up hybrid inverters on new and existing GT PV systems in a whole house
>>> backup scenario
>>> i.e. Utility - Hybrid Inverter - House Loads
>>>
>>> With these newer GT hybrids so 'sensitive', any fault on the PV side can
>>> cause them to shut down, thus stopping power to the house.
>>> To minimise this it seems sensible to add an ATS to the system such that
>>> if/when the hybrid faults, the ATS w switch to grid power, bypass the
>>> hybrid, and power the house.
>>> This could save an emergency truck roll or late night phone call for
>>> installers.
>>>
>>> Anyone have experience on good value-for-money Listed automatic transfer
>>> switches that would do the job, 200A, 120/240V?
>>>
>>> Two name brand options that came up on the less expensive end of the
>>> spectrum are:
>>> - Generac
>>> RXSW200A3 
>>> (https://www.generac.com/residential-products/standby-generator-transfer-switches/automatic/rxsw200a3/)
>>>
>>> - Kohler 200-amp, Service Entrance RXT ATS | RXT-JFNC-200ASEQS4 (
>>> https://www.kohler.com/content/dam/kohler-com-NA/Lifestyle/PDF/PDF-g11152.pdf
>>> )
>>>
>>> However, they each say their ATSs must be used with the corresponding
>>> generator.
>>>
>>> I would imagine a simple 'grid sense' functionality would mean that if
>>> the hybrid's output was connected to the Grid/Normal lugs and the grid was
>>> connected to the Gene/Backup lugs in the ATS it should work.
>>> However I don't want to end up with an expensive surprise in a
>>> relatively remote location where I operate!
>>>
>>> Would appreciate any feedback with experience with the above or other
>>> ATS models or how people are future proofing for this scenario?
>>> To do future maintenance/torque checks etc. in a GT hybrid whole home
>>> backup situation, it would be nice to bypass the inverter and keep the
>>> house powered for safety and homeowner convenience in general.
>>>
>>> Thanks and best.
>>>
>>> Sunniest regards,
>>> Stuart
>>> 441 599 2105
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