A dc-rated shunt trip breaker @ 250A (Blue Planet / OB Radian cabinet breaker) would do the trick if they exist. The trip device could be mounted outside.
On Fri, Jan 27, 2023 at 3:55 PM William Miller via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > Glenn: > > > > As I wrote, a DC disconnect is required. Here is an excerpt from the Q&A > with the building official: > > > > 4. Will you be requiring an external disconnect to disconnect the AC > output of the inverter system from premise wiring? > > Yes, as required per 230.85 > > 5. Will you be requiring an external disconnect to disconnect batteries > from the inverters? > > Yes > > > > If the DC disconnect was not required I would not be wasting everyone’s > time with my post. I try to be careful about that, researching on my own > before posting and trying to make my questions very clear. I also try not > to embarrass myself with dumb questions, but that does happen occasionally… > > > > William > > > > Miller Solar > > 17395 Oak Road, Atascadero, CA 93422 > > 805-438-5600 > > www.millersolar.com > > CA Lic. 773985 > > > > > > *From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] *On > Behalf Of *Glenn Burt via RE-wrenches > *Sent:* Friday, January 27, 2023 11:46 AM > *To:* William Miller via RE-wrenches > *Cc:* Glenn Burt > *Subject:* Re: [RE-wrenches] Remote battery disconnects > > > > 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 > > -- *Kirk Herander / **kirkh@vermont.solar <kirkh@vermont.solar>* *Owner|Principal, VT Solar, LLC* *Celebrating our 32st Anniversary 1991-2023!!* dba Vermont Solar Engineering 802.863.1202
_______________________________________________ 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
