[RE-wrenches] Sunny Island Battery Disconnects

[Ray Walters]

I'm working on something similar.  I think the Flex 1000 is the only 
reasonable choice that can handle more than 2 of the large format DC 
breakers.  Midnite has the more expensive MNBCB -1000 Battery Combiner 
box,  but there just isn't enough documentation to figure out what it 
can and can't do.

R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760

On 2/7/2014 6:29 PM, william at millersolar.com wrote:
>
> Friends:
>
> I am reworking an installation with 3 Sunny Island inverters.  The 
> battery leads have no disconnecting means or OCP.  I have been looking 
> for sensible hardware to provide this and I have found some options.  
> I am interested in any input on these or ideas I have not discovered.
>
> 1.SMA BATFUSE.  I am having trouble deciding which one is right for a 
> 3 SI install.
>
> a.The B.003 appears to have fuse positions for the positive and the 
> negative leads.  I am fairly darn certain I don't want fuses in the 
> negative leads of a negative bonded system, and although this is my 
> first SI install, I am pretty sure this is negative bonded.  Am I 
> missing something here?
>
> b.The B.001 has only positions for two fuses as far as I can see from 
> the manual.
>
> c.So it looks like neither will work for me.  Does anyone have any 
> experience and/or wisdom here?
>
> 2.Midnite Solar E-panels:
>
> a.The regular panel has DC and AC components.  I want to control the 
> AC elsewhere so I could order three slave units.  The Midnite unit 
> mounts right under the inverter but I would prefer to have the OCP 
> closer to the batteries.
>
> 3.Outback:
>
> a.We could purchase an Outback FX1000 and install three breakers in it.
>
> 4.Breaker Size:
>
> a.I have started to read the manual but I have yet to find out what 
> size breaker fuse is recommended.  Have I just not found it yet?
>
> b.Also, I have not found a specification for battery cable size.  Am I 
> blind?
>
> Thanks in advance.  I really appreciate the help I receive here.  I 
> try to give as well as receive.
>
> William
>
>
>
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