There is a company called Savant, I’ve seen their individual Smart breakers installed in sqd Panels - they are individual smart breakers. A single pole breaker would actually take up two slots one for the OCPD itself, and one for the sp relay. Don’t know exactly how it operates, but I know you don’t have to buy an entire smart panel for it to work.
As discussed on this forum, also, there are also RF transmitter/ receivers, which can do what you ask. Used them to disconnect an inverter from a common AC bus when the gennie turns on. *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 On Fri, Aug 22, 2025 at 8:21 PM Chris Sparadeo via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > Hi Chris, > > I’m wondering if a load management device like this could be helpful? > However, it does not discern between grid presence and island mode, so it > might not fit the bill. > > > https://www.getstepwise.com/product?gad_source=1&gad_campaignid=22363404421&gclid=Cj0KCQjwqqDFBhDhARIsAIHTlkub687mJZYb6g0nIR33X1eA2FVY3bMc_zBxMr44IEl5a7QenVljhUgaArKeEALw_wcB > > Quick caveat that shedding an HVAC unit potentially mid cycle is not ideal > for the health of that unit…but neither is an overload and subsequent power > failure. > > I do know that Lumin Smart sells remote CTs for grid detection. Might be > worth a call to them to see if this fairly inexpensive product can pair > with a remote contactor to open the HVAC circuit. > > Best of luck! > > -Chris > > On Fri, Aug 22, 2025 at 3:54 PM Christopher Warfel via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > >> We installed a 4kW Outback multimode system about 8 years ago. An >> electrician came in afterwards and installed 3 heat pumps on the battery >> backed up power panels. The Outback inverter disconnected on load every >> time there was a power outage. The electrician really messed up and is >> long gone. Also found out did not pull a permit. But I digress. We >> managed to move two of the heat pump circuit breakers to the utility >> panel, so no longer on the battery backed up power panels. The third >> heat pump is the problem as it is located in an apartment building >> remote from the main house. The whole apartment subpanel, including the >> heat pump load is interconnected to the "main" battery backed up power >> panel in the home. >> >> A master electrician and I are considering how to shed the apartment >> heat pump in a power outage. We cannot easily run a separate circuit to >> the apartment building to pick up this load. We have considered a smart >> panel, but the cost seems high for one circuit. Does anyone know of a >> power line product of RF product or similar that could operate this >> breaker when the main service panel loses power? I have been >> unsuccessful over months of sporadic research. >> >> Thanks in advance. >> >> >> Chris >> >> >> >> >> >> >> >> >> -- Christopher Warfel, PE ENTECH Engineering, Inc. PO Box 871, Block >> Island, RI 02807 (401) 447-5773 >> _______________________________________________ >> 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 > >
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