[RE-wrenches] Remote battery disconnects

[Christopher Warfel]

This was my first thought too.  An ac disconnect that is readily 
available that controls the ac conductors to the back up loads panel(s) 
would be less dangerous and has much less worries about it failing.  Chris

On 1/27/2023 2:45 PM, Glenn Burt via RE-wrenches wrote:
> Does the AHJ really want the batteries disconnected from conductors, 
> or does he really just want the inverters to stop operating and 
> producing AC within the house?
> Obviously there is a big difference here and it may be changing as the 
> code evolves.
>
> -Glenn
> Sent from my 'smart'phone, so please excuse typos and spelling errors.
>
> ------ Original message------
> *From: *William Miller via RE-wrenches
> *Date: *Fri, Jan 27, 2023 2:26 PM
> *To: *RE-wrenches;
> *Cc: *William Miller;
> *Subject:*[RE-wrenches] Remote battery disconnects
>
> Friends:
>
> We have a large-ish residential off-grid system install coming up.  
> The AHJ has said they will require a remote battery disconnect.  I 
> suspect there will be fire sprinkler controls and a pressure pump that 
> would become inoperable if this system were engaged.  In this case we 
> will apply for a waiver.
>
> The last time this was discussed here as far as I can find was October 
> of 2020.  At that time no one suggested any specific battery 
> disconnect equipment.
>
> To further clarify my needs:  There will be 4 or 5 Radian 8048 
> inverters (5 or 6 4/0 battery circuits, ~350A each) and two 175 amp PV 
> recombiner outputs.  That is 6 poles of high amperage DC disconnects.
>
> The battery array will be either a UnigyII VRLA or a lithium of a 
> brand yet to be determined.  In the case of lithium we will look for a 
> system that can remotely enable a BMS shutdown.  In the case of a VRLA 
> lead-acid, we will not have that luxury.
>
> I have done some considerable research and have not found viable, high 
> amperage, remotely activated shutdown equipment.
>
> I am wondering what hardware others may be using to achieve remote 
> battery disconnecting in these types of cases..
>
> William
>
> Miller Solar
>
> 17395 Oak Road, Atascadero, CA 93422
>
> 805-438-5600 <tel:805-438-5600>
>
> www.millersolar.com <http://www.millersolar.com/>
>
> CA Lic. 773985
>
>
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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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