If I'm reading the Kohler RDT manual right, it won't matter if both primary and emergency 240 v power are present on their seperate inputs simultaneously, and the contactor will only switch to emergency when primary power is lost. In effect the control logic assumes it started an emergency generator OK as soon as its start gen dry contact closes, seeing the "aways on" emergency source. I hope it's this way.
In this case primary power is an existing battery/inverter output, and emergency will be a new & separate H2 / battery / inverter output. A "backup to the backup" for beta test of the H2, at least for now. On Sat, Mar 1, 2025 at 11:22 AM William Miller via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > Kirk: > > I recently installed a Kohler RDT transfer switch that does exactly what > you specified. The RDT is an AC-Seeking ATS. There is an option to create a > contact closure upon failure of the primary AC input. > > Even though the device is Kohler branded it has no proprietary connections > to the genset- it is generator agnostic. > > The unit comes in several standard sizes. It can be ordered as service > equipment and with or without on-board distribution. It’s a nice piece of > kit. > > I can send the manual if you’d like. > > William Miller > Miller Solar.com > 805-438-5600 > www.millersolar.com > > > On Sat, Mar 1, 2025 at 7:03 AM Kirk Herander via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > >> Hello All, >> >> I am looking for a non-generator brand specific 100A ATS to switch to >> secondary power when the utility goes out, period. IMO this means the >> contactor coil would have to be controlled >> by the utility AC, either 120 or 240,. If utility fails, the contactor >> switches to N/C secondary power. No outside control signals required. >> Thanks in advance. >> >> -- >> >> *Kirk Herander / **kirkh@vermont.solar <kirkh@vermont.solar>* >> >> *Owner|Principal, VT Solar, LLC* >> >> *Celebrating our 34st Anniversary 1991-2025!!* >> >> dba Vermont Solar Engineering >> >> 802.559.1225 >> _______________________________________________ >> 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 > > -- *Kirk Herander / **kirkh@vermont.solar <kirkh@vermont.solar>* *Owner|Principal, VT Solar, LLC* *Celebrating our 34st Anniversary 1991-2025!!* dba Vermont Solar Engineering 802.559.1225
_______________________________________________ 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
