<div dir="ltr">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.<div><br></div><div>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.</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Sat, Mar 1, 2025 at 11:22 AM William Miller via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">Kirk:</div><div dir="auto"><br></div><div dir="auto">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. </div><div dir="auto"><br></div><div dir="auto">Even though the device is Kohler branded it has no proprietary connections to the genset- it is generator agnostic. </div><div dir="auto"><br></div><div dir="auto">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. </div><div dir="auto"><br></div><div dir="auto">I can send the manual if you’d like. <br clear="all"><div dir="auto"><div dir="ltr" class="gmail_signature"><br>William Miller<br>Miller Solar.com<br>805-438-5600<br><a href="http://www.millersolar.com" target="_blank">www.millersolar.com</a><br></div></div></div><div><br></div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Mar 1, 2025 at 7:03 AM Kirk Herander via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr"><div>Hello All,</div><div><br></div><div>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 </div><div>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.</div><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><p class="MsoNormal" style="color:rgb(0,0,0);font-family:Arial;font-size:16px;margin:0in 0in 0.0001pt"><span style="font-size:10pt"><a name="m_3587505533115254632_m_-3919300189480454238_m_7612915714200606809_SignatureSanitizer__MailAutoSig"><b>Kirk Herander / </b></a><b><a href="mailto:kirkh@vermont.solar" title="Send an email to kirkh@vermont.solar; Send an email to kirkh@vermont.solar" style="color:blue" target="_blank">kirkh@vermont.solar</a></b></span></p><p class="MsoNormal" style="color:rgb(0,0,0);font-family:Arial;font-size:16px;margin:0in 0in 0.0001pt"><span style="font-size:10pt"><b>Owner|Principal, VT Solar, LLC</b></span></p><p class="MsoNormal" style="color:rgb(0,0,0);font-family:Arial;font-size:16px;margin:0in 0in 0.0001pt"><span style="font-size:10pt"><b><i>Celebrating our 34<sup>st</sup> Anniversary 1991-2025!!</i></b></span></p><p class="MsoNormal" style="color:rgb(0,0,0);font-family:Arial;font-size:16px;margin:0in 0in 0.0001pt"><span style="font-size:10pt">dba Vermont Solar Engineering</span><br></p><p class="MsoNormal" style="color:rgb(0,0,0);font-family:Arial;font-size:16px;margin:0in 0in 0.0001pt"><span style="font-size:10pt">802.559.1225</span></p></div></div></div>
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</blockquote></div><div><br clear="all"></div><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><p class="MsoNormal" style="color:rgb(0,0,0);font-family:Arial;font-size:16px;margin:0in 0in 0.0001pt"><span style="font-size:10pt"><a name="SignatureSanitizer__MailAutoSig"><b>Kirk Herander / </b></a><b><a href="mailto:kirkh@vermont.solar" title="Send an email to kirkh@vermont.solar; Send an email to kirkh@vermont.solar" style="color:blue" target="_blank">kirkh@vermont.solar</a></b></span></p><p class="MsoNormal" style="color:rgb(0,0,0);font-family:Arial;font-size:16px;margin:0in 0in 0.0001pt"><span style="font-size:10pt"><b>Owner|Principal, VT Solar, LLC</b></span></p><p class="MsoNormal" style="color:rgb(0,0,0);font-family:Arial;font-size:16px;margin:0in 0in 0.0001pt"><span style="font-size:10pt"><b><i>Celebrating our 34<sup>st</sup> Anniversary 1991-2025!!</i></b></span></p><p class="MsoNormal" style="color:rgb(0,0,0);font-family:Arial;font-size:16px;margin:0in 0in 0.0001pt"><span style="font-size:10pt">dba Vermont Solar Engineering</span><br></p><p class="MsoNormal" style="color:rgb(0,0,0);font-family:Arial;font-size:16px;margin:0in 0in 0.0001pt"><span style="font-size:10pt">802.559.1225</span></p></div></div>