[RE-wrenches] Rapid Shutdown Battery Systems

[Tump]

I know that IF the SMA SI  master inverter is shut down then all follow, shunt trip breaker only for the master? Also look at the Midnite MNBCB 1000/50
(Previous Model Num: MNBCB-1000/50-Battery Combiner)
MidNite 1000amp battery combiner box
Includes a 1000amp Positive and Negative bus bar with 3/8 inch studs.
On Aug 26, 2015, at 3:39 PM, Ray Walters wrote:

> Hi Wrenches;
> 
> I have an upcoming project to be inspected, ,and having spent too much time on off grid and out of country work, I'm now playing catch up with the new 690.12 and 690.71(H) requirements.
> The proposed GTB system is 3 Radians with a ground mounted 18kW array and large HUP battery bank.  I just read a Bill Brooks article that basically says that Rapid Shutdown not only applies to ground mounted arrays that come into buildings, but also applies to battery cables if longer than 5 ft.
> There are 690.12 compliant combiners from Midnite that work with their Birdhouse system, so I think I've got a handle on the array requirements (more or less).
> What is stumping me is how to feed three 8kW inverters from a large battery, and install auto disconnect breakers within 5 ft.
> 1) the disconnect has to be large enough, Midnite only makes a 250 amp remote trip breaker, so I'd have to parallel 3 of these?
> 2) 690.71(H)3 says the breaker can't be in the battery enclosure, which is tricky since the enclosure is 160" long from one end to the other with 2 parallel strings.
> 3) I'm having trouble even finding an enclosure for 3 large DC breakers (Flex 1000 is the only thing I know of) and to get the enclosure close enough is an issue too.
> I just got off the phone with Tech support at Outback and they don't seem to have any Rapid Shutdown gear ready.
> Are inspectors actually requiring this yet, or because of the lack of available UL listed products, can we take a pass on at least some of the requirements?  Another strategy the Outback tech thought of is to put all the equipment into a shipping container and then its not in or on a "building", and 690.12 doesn't apply.
> 
> -- 
> R.Ray Walters
> CTO, Solarray, Inc
> Nabcep Certified PV Installer,
> Licensed Master Electrician
> Solar Design Engineer
> 303 505-8760
> 
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