...that last sentence of Ray's...what a fine additional factor to bring up:
Inherent current limitation because the battery just can't do more. I'm
going back to my charts!
Mick Abraham, Proprietor
www.abrahamsolar.com
Voice: 970-731-4675
On Sun, Feb 21, 2010 at 10:19 PM, R Ray Walters
I have always used 4/0 through out the bank.
I guess that I have had to replace to many dead batteries at this point.
If you are under sizing the parallel strings, what happens when a cell
fails? or 2 cells fail.
Now all the current would be carried by one string.
If you are running equal
We usually figure that (for example) in a 2-string bank, that one conductor
could carry 2/3 of the current if the batteries are unbalanced for some reason.
In other words, rather than cutting the amperage rating in half, we cut it by
about 1/3. For 3 banks would cut it by 1/2, etc.
Probably
Example: 12 two volt battery cells in one 24 volt string. 4kW
inverter/charger has 250 amp DC breaker size and 4/0 cables...as the
inverter folks would want.
So...do the cell to cell interconnect cables have to also be 4/0? In the
example above, 2/0 interconnects would suffice from the standpoint
The interconnects are part of the circuit. Typical flexible cables used
with batteries are THW rated (75C column), so in free air 2/0 interconnects
would be good for 265 amps, before any temperature derates. Therefore,
you'd be safe from a NEC point of view. However, if the inverter
As an inverter manufacturer .. I (we) agree with Phil. He's absolutely on
target with his reply.
Dan
Sr. Engineer
--- On Fri, 2/19/10, Phil Undercuffler solarp...@gmail.com wrote:
From: Phil Undercuffler solarp...@gmail.com
Subject: Re: [RE-wrenches] single string of batts: must the
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