[RE-wrenches] How to shed a load in a subpanel that is in a building other than where the solar system is interconnected

[drake.chamberlin at redwoodalliance.org]

Can you use a contactor with the coil wires connected to the AC IN of 
the Outback? When incoming AC goes down, the contactor will open to shed 
the compressor circuit.

_Drake Chamberlin_

_Athens Electric LLC_

_Ohio Electrical Contractor's License 44810_

_NABCEP Certified PV Installation Professional_

---

On 2025-08-22 15:54, Christopher Warfel via RE-wrenches 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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