2017 code has a specific exception/clarification for ground mount solar that it does not need RS. It’s in the first line after 690.12
Jay > On Feb 1, 2022, at 12:13 AM, William Miller <will...@millersolar.com> wrote: > > > Jerry: > > Yes it is required. Rapid Shutdown: NEC 690.12. All buildings except > dedicated solar buildings. Read it and weep. > > William > > Miller Solar > 17395 Oak Road, Atascadero, CA 93422 > 805-438-5600 > www.millersolar.com > CA Lic. 773985 > > > From: Jerry Shafer [mailto:jerrysgarag...@gmail.com] > Sent: Monday, January 31, 2022 7:21 PM > To: William Miller; RE-wrenches > Subject: Re: [RE-wrenches] Rapid Shutdown for Off-grid systems > > William > Are you sure RSD is required on a non habitable building, historically its > not required. Now that being said we use fire raptor with the best results, > yes it takes an extra conduite and might require a button and power supply > depending on inverter application. > Jerry > > On Mon, Jan 31, 2022, 9:57 AM William Miller <will...@millersolar.com> wrote: > Friends: > > It is quite rare for us to install off-grid systems on roof-tops. We have > one coming up with about 20kW on a large barn roof. This will be our first > off-grid with a module-level rapid shutdown requirement. I see no exemptions > from RSS for off-grid systems in the code. I have looked at the options and > this is what I have found: > > 1. Fire Raptor > > 2. Tigo TS4-F > > 3. AC coupling with micro-inverters or optimizers > > > No one of these approaches seems ideal. The fire raptor requires extra > wiring for control leads. The Tigo requires a wireless control system which > worries me about reliability. With AC Coupling systems floating the proposed > AGM batteries may be awkward. Furthermore, with AC coupled systems one > cannot charge batteries unless the mini-grid is operational, a big problem. > > Have any of you implemented module-level RSS on a battery-based inverter > system? I looked in the archives and found no threads that apply. Thank in > advance. > > William Miller > > 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. 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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