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Rapid charging DBT, Siemens

Discussion in 'General Charging Discussion' started by Lutek1000, Jan 10, 2017.

  1. Lutek1000

    Lutek1000 Member

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    My charges:

    Charge kW Date Device
    Time
    27min 13.6kW 31/12/16 Siemens
    36min 12.9kW 29/11/16 DBT
    30min 9.5kW 26/11/16 *
    24min 12.9kW 24/11/16 *
    28min 10.9kW 22/11/16 *
    31min 11.3kW 17/11/16 *
    30min 11.4kW 15/11/16 *
    31min 12.1kW 12/11/16 *
    32min 15.2kW 08/11/16 *
    34min 12.9kW 02/11/16 *
    31min 9.2kW 01/11/16 *
    25min 8.3kW 22/10/16 *
    31min 12.5kW 19/10/16 *
    30min 11.9kW 06/10/16 *
    16min 6.0kW 05/10/16 *
    35min 13.4kW 01/10/16 *
    22min 10.4kW 27/09/16 *
    28min 11.3kW 22/09/16 *
    30min 11.9kW 16/09/16 *
    47min 14.5kW 19/08/16 *
    *=DBT
    DBT-Most of it was from about 25% to about 75%-82%
    SIEMENS only once recorded and once not recorded from around 20% to 86% each

    Why would you say there is such a differences in kW delivered?(n)
     
  2. Jack

    Jack Moderator

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    EV:
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    The Seimens unit will deliver a true 50kW at peak, unlike most DBT units which are 43kW max output.
     
  3. Lutek1000

    Lutek1000 Member

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    What about differences using same DBT unit.
     
  4. Jack

    Jack Moderator

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    Most usually heat of the unit, and ability to evacuate heat generated from the unit - poor design means DBT units are consistently inconsistent.
     
  5. Lutek1000

    Lutek1000 Member

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    What about the other DBT I have used the other day which went from 22% to 98% in 38 min. Don't remember kW delivered.
     
  6. Jack

    Jack Moderator

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    Like a said consistently inconsistent, the units are essentially handbuilt in france, sometimes a good one makes it into the field.
     
  7. Lutek1000

    Lutek1000 Member

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    Thanks Jack
     
  8. arg

    arg Well-Known Member Speak EV Supporter

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    To be fair (while I'm no fan of DBT), a lot of it will be down to differences at the car end such as battery temperature, other loads (heater running?), starting and finishing SoC, etc.

    Exactly which factors matter will depend on the car (@Lutek1000 doesn't have car type in his profile).
     
  9. Simon Hewison

    Simon Hewison Well-Known Member

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    And don't forget that the vehicle will slow down the charge rate when it doesn't think the battery can take it quite as quick as would normally be possible, regardless of the capability of the rapid charger. Cold battery temperatures increase the charge time in a very noticeable way.

    The DBT chargers had a problem with thermal management when Tesla first launched it's CHAdeMO adapter, which would happily pull as much as the charger could deliver for over an hour - the design was originally made with a 24kWh Leaf in mind, not a vehicle with a battery three times the size - which was soon noticed as a problem, and temporarily, Tesla limited the max power draw of the CHAdeMO adapter until DBT and the charge point operators could work out a fix. I'm not exactly sure what DBT's fix was - whether it was a hardware retrofit, or a software bodge. DBT also needed a fix when Nissan launched the 30kWh Leaf; it's possible that the same fix handled both the Leaf issue and the Tesla issue.
     
  10. Sandy

    Sandy Zoe Devotee

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    I think there is a presumption the owner has a Leaf there. ;)

    @Lutek1000 what do you drive?
     
  11. Lutek1000

    Lutek1000 Member

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    24kWh 2nd gen Leaf
     
    Dblock likes this.
  12. Dblock

    Dblock Active Member

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    EV:
    Renault Kangoo Van ZE
    :ROFLMAO:
    Yes because he has a record of the car consistently charging and it's not off the road therefore we assumed it's not a zoe.

    Jokes. :ROFLMAO:
     
    Phooby likes this.
  13. Jack

    Jack Moderator

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    We know he couldn't have a Zoe, there was no "My car broke the charger" in the dataset.
     
    Desserper, Dblock and Phooby like this.
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