for the experts 48v battery 36v bike

Discussion in 'Electric Bikes' started by billym0404, 16 Feb 2018.

  1. billym0404

    billym0404 Active Member

    Location:
    durham
  2. raleighnut

    raleighnut Guru

    Location:
    On 3 Wheels
    Depends on the motor, you could easily burn some of them out.
     
  3. OP
    OP
    billym0404

    billym0404 Active Member

    Location:
    durham
  4. raleighnut

    raleighnut Guru

    Location:
    On 3 Wheels
    Some are capable if they're the 250/500w rear wheel versions.
     
  5. OP
    OP
    billym0404

    billym0404 Active Member

    Location:
    durham
    so does that device i showed not adjust the vault age and ampage
     
  6. Tim Hall

    Tim Hall Guru

    Location:
    Crawley
    Reading the blurb on your link, yes it does.
    Whether that will do what you want is another matter. It's a question for @mickle or @kimble I think.
     
  7. cheys03

    cheys03 Well-Known Member

    Whilst this should work in theory I think you'll find that in practice the DC-DC device is not up to the task and burns out shortly after trying it. Especially if you're not adding heatsinks and airflow to cool it.
    What happens then ...? If the DC-DC shorts it will blow the fuse on your battery. If it bypasses it will put 48v in to your 36v eBike controller and might be game over for e part of the eBike. Best case it just blows without consequences but leaving you having to arrange return shipping etc.
    In short you'd be better trying to source a 36v battery within your budget or modify/replace the controller to accept 48v.
     
    raleighnut likes this.
  8. OP
    OP
    billym0404

    billym0404 Active Member

    Location:
    durham
    thanks for that. so bad idea then. i was just wanting to use the same battery on different motors. there must be some way of cutting 48v output down to 36v.
     
  9. OP
    OP
    billym0404

    billym0404 Active Member

    Location:
    durham
    so, and this may be a stupid question. "replace the controller to accept 48v" so on a bafang BBS01 is the controller in the screen (as my screen has a vault-age setting) or is it in the motor case, which is where i think it is.

    i do have a plan b but out of practice and not sure if im up to it, and dont have the right solding iron. i have a neally new 48v 13a battery would guess at 65 cells. i could turn it into 36v 15a using 60 cells and a new BMS. or plan c as the battery is barley used just sell it and buy a new 36v. though that defetes the orginal plan of trying to use the same 48v battery on two different motors lol
     
  10. midlife

    midlife Veteran

    Way back in the 70's doing A level physics I'm sure we messed around with voltages using Zener diodes and split circuits with resistors....
     
  11. OP
    OP
    billym0404

    billym0404 Active Member

    Location:
    durham
    someone has suggested diodes but running 48v through 36v diodes they would just blow.
     
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