Hi Stuart, The Kohler RDT switch is a much better switch for what you are doing; it is a power seeking switch with no accessory device communication needed. It is more expensive than the RXT switch because it has its own brain board. A Kohler tech can adjust the delays for you if needed but the defaults are good. We have a few of them out there with no issues. They have them available as service entrance rated/indoor/outdoor etc.
Good Luck! On Tue, Jan 14, 2025 at 2:55 PM August Goers via RE-wrenches < [email protected]> wrote: > 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 < > [email protected]> 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 <[email protected]> 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 < >>> [email protected]> 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 >>>> _______________________________________________ >>>> List sponsored by Redwood Alliance >>>> >>>> Pay optional member dues here: http://re-wrenches.org >>>> >>>> List Address: [email protected] >>>> >>>> Change listserver email address & settings: >>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>>> >>>> There are two list archives for searching. 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