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John Petersen is executive vice president and chief financial officer of ePower Engine Systems, Inc., a company that has developed, built and demonstrated an engine-dominant diesel-electric hybrid drivetrain for long-haul heavy trucks that promises fuel savings of 25 to 35 percent depending on... More
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  • Quick Note From Istanbul 5 comments
    Sep 23, 2010 10:04 AM | about stocks: ENS, AXPW

    Yesterday in the opening session the president of Enersys Europe (NYSE:ENS) said that stop-start was sweeping Europe and the industry expects it to be a dominant technology by 2015 and standard equipment on all cars by 2020. He also said most of the current stop-start systems are dual battery systems where the total battery value per vehicle was 2x to 3x historic norms.

    This morning BMW presented their proposed dynamic charge algorithm for testing stop-start batteries which is working it's way through the EU regulatory system. It uses a 60 second load of 50 amps to simulate accessories during an engine off event. a 1 second load of 300 amps to simulate the start cycle and a recharging cycle to restore an 80% state of charge.

    Immediately after the BMW presentation, Axion Power (NASDAQ:AXPW) presented a paper that was co-authored by BMW which showed longer term cycle life performance that mirrored the battery degradation graphs I published a couple weeks ago here:

    Based on everything I've seen here, it looks like flooded lead-acid won't work in stop-start. VRLA may work in vehicles that are not accessory rich and PbC will be very competitive for cars with heavy electronics loads. If the BMW testing protocol is adopted by the EU, the PbC advantage will be even greater.

    I'm working on a laptop which is a monumental pain so I'll do something more detailed when I get back to the office.

    Disclosure: Long AXPW.OB

    Stocks: ENS, AXPW
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Comments (5)
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  • D. McHattie
    , contributor
    Comments (1844) | Send Message
    Thanks John. I always want to hear more but this instablog has at least given me a taste.


    Looking forward to the full review.


    23 Sep 2010, 01:00 PM Reply Like
  • froggey77
    , contributor
    Comments (3239) | Send Message
    From your message to him, Kirk T from over at the yahoo Axion mb Listed 400,000 cycles. (for Axion's PbC battery).
    KT has done his usual good job of pointing this out as a possible typo.
    As 40,000 is about 5 years of simulated use. (Also from KT)
    400,000 length of testing seems unlikely.
    As in 50 years worth of cycle life testing.


    Thanks for the update.
    23 Sep 2010, 09:24 PM Reply Like
  • John Petersen
    , contributor
    Comments (30629) | Send Message
    Author’s reply » The number I sent kirk was from recall and may well have been 40,000, which actually makes a bit more sense for a stop-start cycle life, but we won't be getting the conference proceedings disk for another few days to confirm. They may well have run to 400,000 cycles because that's a typical HEV cycling life, but I wouldn't swear to either.
    23 Sep 2010, 11:02 PM Reply Like
  • froggey77
    , contributor
    Comments (3239) | Send Message
    Thanks John.
    Frankly I think either is a win, but I know you want to keep the info straight.
    The graph you had before was only to 5,000 cycles. While it looked really good, it's nice to see the longer data.
    24 Sep 2010, 08:20 PM Reply Like
  • John Petersen
    , contributor
    Comments (30629) | Send Message
    Author’s reply » The longer data was actually quite critical because showing six months is interesting but showing five years is an order of magnitude more impressive. While the PbC graph was as stable as a rock for the whole test, the others didn't fare anywhere near as well.
    25 Sep 2010, 12:56 AM Reply Like
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