c-40 battery charging [RE-wrenches]

[Matt Tritt]

I see your point. I suppose my question would be related to what I've seen
in large battery installations in various crirical off-grid and backup
installations; that is, if fusing individual strings seems to be such a good
idea, why isn't it a standard procedure in large arrays? Buss bars are.

Matt T
----- Original Message ----- 
From: "Greg Egan" <gegan at renewalaska.com>
To: <RE-wrenches at topica.com>
Sent: Friday, October 10, 2003 11:23 AM
Subject: Re: c-40 battery charging [RE-wrenches]


> Matt,
>
> Unless I'm missing something, the buss bar doesn't prevent one string
> getting overcharged by the other strings. The way I understand it, if
> string "A" has some kind of a short, parallel strings B & C will try to
> charge it. If we only have a fuse between the buss bar and the DC
> disconnect, it doesn't protect against overcurrent when one or more
> strings are charging the shorted string.
>
> Greg
>
>
>
> Matt Tritt wrote:
> > I think that with multiple strings the buss bar plan is the way to go to
> > avoid having to fuse each string. If there is no reason for any one
> > string to take too much current the need for an individual string to
> > have a fuse is negated. This is so weird. I used to connect all my
> > parallel strings to a common buss until just a few years ago. A big
> > battery guru told me it wasn't necessary.
> >
> > The more things change the more they stay the same.
> >
> > Matt T
> >
> > -----Original Message-----
> > From: William Miller [mailto:wrmiller at slonet.org]
> > Sent: Friday, October 10, 2003 1:38 AM
> > To: RE-wrenches at topica.com
> > Subject: Re: c-40 battery charging [RE-wrenches]
> >
> >
> > Learned Colleagues:
> >
> >
> > Would it be advisable to install a class T fuse between strings?
> >
> > William Miller
> >
> >
> >
> >
> > At 08:39 PM 10/10/2003 +1300, you wrote:
> >
> >>I have seen the result of an AGM meltdown.  It was a telecom
> >>installation and one block went bad, the rest discharged into it and
> >>the result was an unbelievable mess.  One string is the way to go.
> >>
> >>Cheers,
> >>Bruce Geddes
> >>PowerOn
> >>
> >
> >
> > __________________________________________________________________
> > William Miller
> > Miller Power and Communications
> > PO Box 50, Santa Margarita, CA 93453
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