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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