[RE-wrenches] Rapid Shutdown Control for a System for a Multimode System Adding an Array to a Subpanel in Garage

[Christopher Warfel]

It was tough for me to figure out how to write my email and not make it 
confusing.

What I am worried about is the microinverter system operating when the 
utility goes down and the microinverters continuing to operate and 
charge the batteries as a load.  I need to disconnect the microinverter 
circuit only when the batteries are fully charged in grid isolated 
mode.  All the ways I can think of that would normally work to 
deenergize the microinverters automatically based upon battery voltage 
won't work.  I can submit a drawing if that would help. I am trying not 
to run another conductor circuit from the house to the garage.  I 
realize that would solve the problem, but it is an expensive solution.  
English is my foreign native language.


On 11/23/2021 10:39 AM, August Goers wrote:
> Hi Chris - If I'm following you right, you have a PV system on a 
> detached garage that ties into a backup subpanel also in the garage? 
> The code only requires the RSID (rapid shutdown initiation device) to 
> be on the exterior of the building. Would it work to put the RSID on 
> the garage exterior? You could route your PV circuits to a switch or 
> switches on the exterior of the garage on the way down to the sub it 
> ties into. You could also use a shunt trip breaker(s) for the PV 
> circuit(s). If for some reason you need to have the RSID on the main 
> house, it gets trickier. Might need to trench?
>
> August
> Luminalt
>
>
> On Tue, Nov 23, 2021 at 7:24 AM Christopher Warfel 
> <cwarfel at entech-engineering.com> wrote:
>
>     I would appreciate ideas on how to shut down a proposed
>     microinverter system on a garage that is 100% serviced by an
>     Outback Radian multimode system in the main building that has the
>     garage on the back up service panel in the main building.
>
>     Garage has a MLO subpanel that is connected to the multimode back
>     up service panel that is in the main building.
>
>     If grid goes down, we need to disconnect the microinverter array
>     so it does not overcharge the battery system. If we use the
>     battery voltage relay, we will take out all the garage circuits,
>     which would disable its heating system, etc. We just want to
>     disconnect the microinverter circuit in the garage subpanel.
>
>     Does anyone know of a product that could do this. I would imagine
>     a transmitter, or perhaps something else besides a microinverter
>     array?
>
>
>     Thanks for any help. Chris
>
>
>
>
>     -- 
>                             Christopher Warfel
>     ENTECH Engineering, Inc.
>     PO Box 871, Block Island, RI 02807
>     401-466-8978
>     <http://entech-engineering.com>
>
>
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-- 
             Christopher Warfel
                      ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
                                 401-466-8978
<http://entech-engineering.com>

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