[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]

P.S.

You would need to run the control wires back to the inverter. Can you 
possibly run a pair of #16 wires the through the conduit feeding the 
building with the compressor?

---

On 2025-08-23 09:30, Drake Chamberlin via RE-wrenches wrote:

> 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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