Many thanks again Mac and Wrenches, This is now put to bed with confirmation the only listed 200A ATS that will work without a 12V switching controller that I could find around the $1k mark is indeed the Kohler RDT series. (All currently manufactured Generac, Briggs & Stratton and Cummins ATS options require a controller to talk to the same name brand gene to switch/transfer, or a Mcgiver move.)
I found a supplier in Florida who gave a slight volume discount and seems solid. Here is a link to the product, pricing, specs and manual through them: https://bnhgenerators.com/product/kohler-200-amp-rdt-ats-rdt-cfnc-0200a-qs7/ And another supplier option with similar pricing, and the 100A version readily available in case helpful: https://www.electricgeneratorsdirect.com/Kohler-RDT-CFNC-0200A-QS7/p2202.html Best to all and thanks again. Sunniest regards, Stuart 441 599 2105 On Tue, 14 Jan 2025 at 21:02, Mac Lewis <maclew...@gmail.com> wrote: > 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 < > re-wrenches@lists.re-wrenches.org> 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 < >> 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 >>>>> _______________________________________________ >>>>> List sponsored by Redwood Alliance >>>>> >>>>> Pay optional member dues here: http://re-wrenches.org >>>>> >>>>> List Address: RE-wrenches@lists.re-wrenches.org >>>>> >>>>> Change listserver email address & settings: >>>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>>>> >>>>> There are two list archives for searching. When one doesn't work, try >>>>> the other: >>>>> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >>>>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>>>> >>>>> List rules & etiquette: >>>>> http://www.re-wrenches.org/etiquette.htm >>>>> >>>>> Check out or update participant bios: >>>>> http://www.members.re-wrenches.org >>>>> >>>>> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> >> > > -- > > > > Mac Lewis > > *"Yo solo sé que no sé nada." -Sócrates* >
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