[RE-wrenches] ATS models to bypass GT hybrid inverters for maintenance/faults

[Jerry Shafer]

Asco and kohler both are good, and have used them on AC coupled systems
with great success.  Ya l know AC coupled is not the ideal but in
retrofitting it's very common unless you also can replace the inverter with
something like Solark.

On Tue, Jan 14, 2025, 11:10 AM Stuart Kriendler via RE-wrenches <
re-wrenches at 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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