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12 v to 48 v boost converter for 48 v electric bike

Discussion in 'General Electronics Discussion' started by Akbar, Jan 27, 2017.

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  1. Akbar

    Akbar

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    Jan 27, 2017
    Hi ,
    Is it possible to use 12 v to 48v booster circuits to power up a 48 v electric bike.
    Currently my bike using 4 nos 12v 20 aAh battery in series to provide enough power.
    Now i am looking to use one 12 v battery connected with 12 to 48 v booster converter. is it possible to run the bike this way ? And what the required ah capacity of new 12v battery?
    Please help
     
    Last edited: Jan 27, 2017
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    It is generally possible. The effort depends on the current requirements on the 48 V rail (including surge currents when starting up the motor).
    Note that on the 12 V side you will need to supply a bit more than 4 times the current on the 48 V side to maintain the power. This will drain your single battery 4 times faster.
     
  3. Akbar

    Akbar

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    Jan 27, 2017
    I think the motor rated around 250 watts.can I use 12v 80 ah battery for 30 km ride on single charge with booster ?
     
  4. davenn

    davenn Moderator

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    Sep 5, 2009
    not enough info and too many variables to answer that
     
  5. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    250 W equals approx. 25 A from 12 V assuming an efficiency of ~80 % for the boost converter.
    Assuming furthermore that you can get ~60 Ah realistically out of an 80 Ah battery, that's 2.4 hours of operation at full load.
    Riding 30 km in 2.4 hours sounds entirely possible, depending on the terrain (flat, hilly...).
     
  6. davenn

    davenn Moderator

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    Sep 5, 2009
    is one of the significant variables I was referring to
     
  7. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    I know. Just wanted to get the discussion started.
     
    davenn likes this.
  8. davenn

    davenn Moderator

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    maybe you didn't understand .... I am in agreement with you :)
     
  9. Akbar

    Akbar

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    Jan 27, 2017
    could you please provide me a circuit diagram ?
     
  10. BobK

    BobK

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    Jan 5, 2010
    What do you expect to gain by going from a 48V to a 12V battery? Because you will be losing about 20% in the conversion.

    Bob
     
  11. Akbar

    Akbar

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    Jan 27, 2017
    to run a 48v dc motor on a sigle 12v 80ah battery.currently i having 4 numbers of 12v 20 ah battery connected in series and its cost me total around 150 us$ and its not long lasting 12 moth warranty only, if i go for single 12 v 80 ah battery its only cost me 75 us $ long lasting 36 month warranty and cheap .
     
  12. BobK

    BobK

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    Jan 5, 2010
    OK. That makes sense.

    To get the same run time, though, you should go to a 12V 100AH battery.

    Bob
     
  13. Bluejets

    Bluejets

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    I'd be very wary of the claims of ah rating and warranty in a "cheap" battery.
    Personally never seen a warranty extend beyond 12 months and even then, chockerblock full of conditions.
    I doubt there would be any warranty if you are using it in the application described given the risk of deep cycling a standard battery (if that is what it is)
     
  14. Akbar

    Akbar

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    Jan 27, 2017
    IMG_1295.PNG
    Pls check the image stating warrenty here in india
     
  15. Bluejets

    Bluejets

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    You can be certain the warranty details will contain more than that which is displayed in any "offer".

    Still, if you think you know better then go for it.

    We try to be helpful here.
     
  16. Akbar

    Akbar

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    Jan 27, 2017
    I already used a battery from them and I got replaced with extended warranty
     
  17. HarryA

    HarryA

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    Jan 22, 2017
  18. Bluejets

    Bluejets

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    Oct 5, 2014
    I think that with 12v in you will get 12v pwm out.
     
  19. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    Right, this is a motor controller only, not a boost converter.
     
  20. HarryA

    HarryA

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    Jan 22, 2017
    Thanks. Are there more efficiency circuits for DC to DC inverters than the class B amplifier type?
    The type that uses a pair of transistors feeding a center tapped transformer.
    For Akbar's 48 volts one would need about 68 plus volts into a bridge rectifier?
     
    Daddy-O likes this.
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