[RE-wrenches] Module-Level Shutdown for off grid systems

[Ray]

Midnite Solar has their SOB system that attaches inline with the 
modules. It can do both String level and module level shutdown. We've 
used it off grid with success.  The biggest issue is it is not 
compatible with most charge controllers, except Magnum's PT 100 for some 
reason.  We used the PT 100, used one pole of a 3 pole DC disconnect for 
the "ON" signal, and all worked fine.  No nuisance tripping or other 
issues for over a year.   We did not bother with controlled breakers, 
etc at the charge controller, and certainly not the inverter.

As is clear in Figure 690.1(b) Note (2) /The PV system disconnect... 
separates the PV system from all other systems. /This means that we 
label the external DC disconnect as /PV Disconnect, /and the voltage 
requirements of 690.12 only apply up to that PV disconnect.  Articles 
445 Generators, 480 Batteries, 705 Interconnected Systems, 706 Storage 
Systems, and 710 Stand Alone Systems, all apply after the PV disconnect.

Ray Walters
Remote Solar
303 505-8760

On 9/27/19 11:23 AM, Lorenzo Ortiz wrote:
> Wrenches,
>
> Are any of you looking ahead at solutions for module level rapid 
> shutdown for off grid? Here in CA it's being implemented next year (at 
> least in my area) and I haven't found any reliable, proven, 
> *cost-effective* products yet.
> I know Tigo has some sort of inline component but haven't heard a lot 
> about it.
>
> Any input is appreciated.
>
> Thanks
>
> -- 
> __
> Loren Ortiz
> Technical PV Design Specialist - Commercial/Residential/Off-Grid
>
> loren at cal-solar.com <mailto:loren at cal-solar.com> californiasolarco.com 
> <http://californiasolarco.com>
> *Main:530-274-3671 ext: 311 ****Fax:530-274-7518*
>
> **
>
>
>
> <https://californiasolarco.com/referral_form/>
> *Showroom located at: 149 E Main St. Grass Valley, CA 95945*
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