[RE-wrenches] Rapid Shutdown for Off-grid systems

[Jay]

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 <william at 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:jerrysgarage01 at 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 <william at 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
>  
>  
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