Re: [RE-wrenches] Remote battery disconnects

[Jay via RE-wrenches]

Good point Glenn.  My question is if this system is in its own building. If so it is probably easier to convince the AHJ about not needing a remote battery disco.  Jay On Jan 27, 2023, at 12:46 PM, Glenn Burt via RE-wrenches <re-wrenches@lists.re-wrenches.org> 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 www.millersolar.com CA Lic. 773985     _______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org

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