[RE-wrenches] Remote battery disconnects

[Glenn Burt]

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.-GlennSent from my 'smart'phone, so please excuse typos and spelling errors.------ Original message------From: William Miller via RE-wrenchesDate: Fri, Jan 27, 2023 2:26 PMTo: RE-wrenches;Cc: William Miller;Subject:[RE-wrenches] Remote battery disconnectsFriends: 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 Solar17395 Oak Road, Atascadero, CA 93422805-438-5600www.millersolar.comCA Lic. 773985  
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