[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]

Thank you, It's pretty tight, I am hoping for some radio or wifi breaker 
to send a signal.  Just no luck yet. Chris

On 8/23/2025 9:37 AM, Drake Chamberlin via RE-wrenches wrote:
>
> 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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-- 
Christopher Warfel, PE
ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
(401) 447-5773
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