Bus Bars on batteries [RE-wrenches]

[Travis Creswell, Ozark Solar]

To me, it's another argument for 48 volt systems and the big two volt cells.
 I wish I could get more folks to cough up for the big 2 volt cells but they
are ridiculously expensive and to date I have only one set of the big
Surrettes,1104 ah's @ 48 volts (one series string).  They seem to be more
charge efficient and have as lower self discharge than the golf carts and
L-16's I have seen.  But I have way to prove that.

Why are the big 2 volt cells so expensive?  Is there any reason other than
low production volumes?  On paper they are a lot cheaper per cycle than
L-16's but 10 grand vs. 2 grand is pretty hard to justify no matter how long
they last.

Travis Creswell
----------
>From: Tom Elliot <telliot at wagonmaker.com>
>To: RE-wrenches at topica.com
>Subject: Re: Bus Bars on batteries [RE-wrenches]
>Date: Mon, Sep 17, 2001, 1:23 PM
>

>Bill,
>
>My original post and my installation are not about battery *interconnects*
>but about the connections between batteries (or series connected batteries)
>and a *main buss* (see http://www.wagonmaker.com/newbatt.html to see what I
>mean).  In my installation the series pairs are interconnected with 1/0
>cables and the pairs are connected to the main buss with 1/0 cables.  It
>isn't about stress on battery terminals or replacing cables it is about the
>wiring scheme itself.
>
>A main buss is designed as the central connection point for all series
>strings in order to eliminate the parallel battery connections that are a
>weak point in battery banks.
>
>We've all known for a long time that too many paralleled series strings is
>not good.  What surprises me now is that we could think that *any* parallel
>connected series strings are a good idea.  If a parallel connection is good
>then it should be no problem for any number of series strings.  By limiting
>ourselves to only 3 or 4 parallel strings we are keeping the problems at a
>low enough level that they don't show up right away.
>
>It seems to me that we can just eliminate the problem entirely by
>eliminating any parallel strings and connecting the batteries and inverter
>together through a main buss that evenly distributes charge/discharge across
>all the series strings.
>
>Tom
>
>
>----- Original Message -----
>From: "Bill Brooks" <billbrooks7 at earthlink.net>
>To: <RE-wrenches at topica.com>
>Sent: Monday, September 17, 2001 5:31 AM
>Subject: RE: Bus Bars on batteries [RE-wrenches]
>
>
>> Bob,
>>
>> In my mind the issue is whether the busbar was designed to be used with
>that
>> particular battery. Since the only battery systems to be listed are UPSs,
>> anything we do with batteries could probably be challenged by an
>inspector.
>>
>> My personal preference is flexible cables like those that Trace sells. The
>> key benefit of flexibility is that it does not stress the battery
>terminals.
>> Busbars and rigid cables can stress terminals unless they have been
>designed
>> as part of a system where terminal stress has been considered in the
>> engineered design.
>>
>> Our industry is in desperate need of listed battery systems. It will make
>> inspection much more straightforward.
>>
>> Bill.
>>
>> > -----Original Message-----
>> > From: Bob Ellison, Alternative Energy Systems [mailto:ellison at gisco.net]
>> > Sent: Monday, September 17, 2001 7:36 AM
>> > To: RE-wrenches
>> > Subject: Bus Bars on batteries [RE-wrenches]
>> >
>> >
>> > Can anyone tell me where in article 690 of the NEC that bus bars are
>> > excluded from use in home power systems?
>> > I had a discussion with a telecom designer and they use them all the
>time.
>> >
>> > Thanks,
>> > Bob
>> >
>> >
>> > RE. Ellison
>> > Supplier of;
>> > Diesel Generators &
>> > Alternative Energy Systems & Supplies
>> > 34642 Countryman Road
>> > Theresa, NY. USA
>> >                               13691-2076
>> >
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