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
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