Hi William, Keep in mind that the bigger Midnite remote trip breakers aren't UL listed last I checked.
Let us know what you come up with. On Fri, Jan 27, 2023 at 2:39 PM Bradley Bassett via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > Wiliam, > > I designed a system for this using the MidNite RT breakers. They use 24VDC > to trigger them, but you must then open the 24VDC to them once they have > tripped or it will burn out the coil in the breaker. What I designed was a > 48VDC to 24VDC power supply and a EPO button that is normally open. We have > both of these, the N.O. button is rare. The power supply is from OutBack. > Then once the breaker has tripped the power is no longer supplied to the > switch or RT breaker. It does require a manual reset of the breaker. I've > attached a drawing of this. > > Brad > AEE Solar > > On Fri, Jan 27, 2023 at 12:54 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 >> >> _______________________________________________ > 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. 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