[RE-wrenches] How to shed a load in a subpanel that is in a building other than where the solar system is interconnected
Christopher Warfel
cwarfel at entech-engineering.com
Sat Aug 23 12:43:57 PDT 2025
Thank you, I did find their website and seeing if it has a chance. Chris
On 8/22/2025 8:37 PM, Kirk Herander via RE-wrenches wrote:
> 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 at vermont.solar*
>
> *Owner|Principal, VT Solar, LLC*
>
> */Celebrating our 34^st 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 at 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
> <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 at 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
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--
Christopher Warfel, PE
ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
(401) 447-5773
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