question on battery cable run [RE-wrenches]

Darryl Thayer daryl_solar at yahoo.com
Mon Sep 22 21:34:14 PDT 2003


hello, here are some of my thoughts.  I know it is two
late to change but

I prefer 48 volt strings to keep wire size down.

You mention 880 Amp hr battery, I would like to see
that be a single string of cells. as oposed to a
paralleled strings.  For example the potenical
problems with 4 strings of 220 amp hours frightens me.
 ( Fires as I mentioned before.) 

If there are parallel strings I fuse each string with
type T fuses.  This is to prevent a problem if one
cell shorts and the other cells back feed into the one
string.  They are avaiable in lower ranges.  

Another thing I do is use Anderson plugs on the
battery strings.  These are the plugs you see on fork
lift trucks. Grainger sells them.  This allows a
disconnection means.  I like daves idea of putting the
fuse on the bttery but would fear corosion.  

I prefer the battery disconnect, the breaker near the
inverter for servicing.  

Even if placed in a shed, still use a vented and
sloped cover on the battery box.  Unless the shead is 
open all the time. 
Daryl


--- ASAP POWER! <asap at podnine.com> wrote:
> Wrenches,
> Per Bill's request below, posting this for him...
> Peter at ASAP POWER!
> He monitors the list and so do I, or respond to him
> directly.  Thanks to
> all.
> 
> 	Could you post this for me?  The RE-wrenches board
> is the only place that
> I figure has a hope of answering this.
> 
> ------------------------------
> 
> 	I am installing a remote power system in a
> doublewide trailer at a local
> airport.  It will start out as a generator assist
> system, and eventually
> the owner will add solar as his budget allows.  It's
> a SW4024 based system
> with 880ah of storage.
> 
> 	The odd part is that he wants the batteries in a
> separate shed; he is
> uncomfortable keeping them indoors (even with a
> battery box) and is
> concerned that the trailer will not support their
> weight.  This seems like
> a reasonable concern.  As a result, the battery
> cables will have to run
> approximately 10 feet.  I'm specifying 4/0 cabling
> and a standard 250A
> Xantrex DC disco near the inverter.  The cables will
> be run outdoors via 2"
> EMT so they'll be reasonably well protected.  My
> question is - is it
> worthwhile to install an additional 250A fuse in the
> battery shed
> itself?  It seems like a bad idea to leave that much
> cable unprotected.  Or
> would it make more sense to simply move the DC disco
> to the battery shed?
> 
> 
> --Bill von Novak
> billvon at dropzone.com
> 
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