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

[Jerry Shafer]

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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