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<p>Thanks, the problem is we need it to disconnect only upon loss of
utility power, and it is on the battery loads panel. The panel for
the HVAC is in another building that the HVAC serves.</p>
<div class="moz-cite-prefix">On 8/22/2025 8:20 PM, Chris Sparadeo
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAAdbmLbWRZxUbQ6gCmmXWbkHTfu9XzULk2kqNT=-_=Rf4+w1VQ@mail.gmail.com">
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<div dir="auto">Hi Chris,</div>
<div dir="auto"><br>
</div>
<div dir="auto">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. </div>
<div dir="auto"><br>
</div>
<div dir="auto">
<div><a
href="https://www.getstepwise.com/product?gad_source=1&gad_campaignid=22363404421&gclid=Cj0KCQjwqqDFBhDhARIsAIHTlkub687mJZYb6g0nIR33X1eA2FVY3bMc_zBxMr44IEl5a7QenVljhUgaArKeEALw_wcB"
moz-do-not-send="true">https://www.getstepwise.com/product?gad_source=1&gad_campaignid=22363404421&gclid=Cj0KCQjwqqDFBhDhARIsAIHTlkub687mJZYb6g0nIR33X1eA2FVY3bMc_zBxMr44IEl5a7QenVljhUgaArKeEALw_wcB</a></div>
<br>
</div>
<div dir="auto">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. </div>
<div dir="auto"><br>
</div>
<div dir="auto">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. </div>
<div dir="auto"><br>
</div>
<div dir="auto">Best of luck! </div>
<div dir="auto"><br>
</div>
<div dir="auto">-Chris </div>
<div><br>
<div class="gmail_quote gmail_quote_container">
<div dir="ltr" class="gmail_attr">On Fri, Aug 22, 2025 at
3:54 PM Christopher Warfel via RE-wrenches <<a
href="mailto:re-wrenches@lists.re-wrenches.org"
moz-do-not-send="true" class="moz-txt-link-freetext">re-wrenches@lists.re-wrenches.org</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)">We
installed a 4kW Outback multimode system about 8 years ago.
An <br>
electrician came in afterwards and installed 3 heat pumps on
the battery <br>
backed up power panels. The Outback inverter disconnected
on load every <br>
time there was a power outage. The electrician really messed
up and is <br>
long gone. Also found out did not pull a permit. But I
digress. We <br>
managed to move two of the heat pump circuit breakers to the
utility <br>
panel, so no longer on the battery backed up power panels.
The third <br>
heat pump is the problem as it is located in an apartment
building <br>
remote from the main house. The whole apartment subpanel,
including the <br>
heat pump load is interconnected to the "main" battery
backed up power <br>
panel in the home.<br>
<br>
A master electrician and I are considering how to shed the
apartment <br>
heat pump in a power outage. We cannot easily run a
separate circuit to <br>
the apartment building to pick up this load. We have
considered a smart <br>
panel, but the cost seems high for one circuit. Does anyone
know of a <br>
power line product of RF product or similar that could
operate this <br>
breaker when the main service panel loses power? I have been
<br>
unsuccessful over months of sporadic research.<br>
<br>
Thanks in advance.<br>
<br>
<br>
Chris<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
-- Christopher Warfel, PE ENTECH Engineering, Inc. PO Box
871, Block <br>
Island, RI 02807 (401) 447-5773<br>
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<pre class="moz-signature" cols="72">--
Christopher Warfel, PE
ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
(401) 447-5773</pre>
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