Battery Cycle Life Ratings [RE-wrenches]

[Matt Tritt]

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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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