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

[Vic Guillot]

William,
We did one this year, offgrid, Outback Radian with Simpliphi batteries.
Used the outback rapid shutdown option which is probably similar to the
fire raptor system.
Cheers!,
Vic Guillot

Vic Guillot
Sol Sierra, Inc.
209.795.3554 office
209.768.3560 mobile/text



On Mon, Jan 31, 2022 at 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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