Battery Cycle Life Ratings [RE-wrenches]

Drake Chamberlin solar at ecoisp.com
Sun Oct 31 19:31:52 PST 2004


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One bank was, and one was not.

At 06:55 PM 10/31/2004 -0800, you wrote:

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>  Drake,
>
>  These must have been Trojan HCs, right?
>
>  Matt T
>  ----- Original Message -----  From: "Drake Chamberlin" <solar at ecoisp.com>
>  To: <RE-wrenches at topica.com>
>  Sent: Sunday, October 31, 2004 3:31 PM
>  Subject: Re: Battery Cycle Life Ratings [RE-wrenches]
>
>
>
>
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>  At 12:01 PM 10/31/2004 -0800, you wrote:
>  >
>  >
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>  >
>  >Drake,
>  >
>  >What kind of cycle DOD do your customers put these cells through? I am very
>  >curious why my experience would be so radically different from yours.
>
>  Two recent systems that I serviced with dead L 16s were Y2K systems that
>  were not really used,
>
>  One person did cycle his down once a month.  I believe he went down 50% of
>  the theoretical amp hours.
>
>  I think that is both cases, an individual battery would go bad in the
>  series sets and then take the rest with it.  If closer track of the
>  batteries were kept, likely a majority of the bank would have lasted longer
>  by replacing a few batteries.   In one case we tried to revive the bank
>  with EDTA.  It did bring over half the batteries up to barely usable.
>
>  >One negative of smaller amp hour batteries means more paralleled series
>  >strings,
>  >which can also lead to difficulties.
>
>  True.  I have used bus bars, which might be the answer.  Bigger batteries
>  for big banks is certainly the way to go.
>
>  Drake
>
>
>  >Todd
>  >
>  >
>  >
>  >Drake Chamberlin wrote:
>  >
>  > > My experience supports the superiority of golf cart batteries.   The T-
>  > > 105s and T-125s seem to be much better than the L -16s.  The  10 
> year rated
>  > > L -16s, in my experience seldom last longer than 5 years, while many 
> of the
>  > > 5 year rated T - 105s and 125s go close to 10 years.
>  > >
>  > > I don't recommend L - 16s to customers any more.  I've gone to the 
> Surrette
>  > > line.
>  > >
>  > > -Drake
>  >
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