[RE-wrenches] Sunny Island Battery Disconnects

william at millersolar.com william at millersolar.com
Fri Feb 7 17:29:04 PST 2014


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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