Test EV Global with bad batteries?

Discussion in 'Electric Bicycles' started by wheelbender6, Oct 31, 2009.

  1. wheelbender6

    wheelbender6 Well-Known Member

    I am moving to Texas, where gas assisted bikes are not street legal, so I'm trading my china girl for an ebike.
    A fellow is interested in trading his 36v EV Clobal to me but the batteries are shot.
    Is there a way for me to verify that the controller and hub motor are sound? Could I jumper 12v current from my car through the bike to verify controller and motor operation? The ebike appears to be in great shape otherwise.
    Last edited: Oct 31, 2009

  2. safe

    safe Active Member

    Most controllers have a low voltage cutoff so that you don't accidentally destroy your batteries by overdraining them. For 36 volts it's usually around 30 volts. This means that if you try to use 12 volts the controller will think it's a low battery condition and cut out.

    So the simple answer on the car battery is "no".
  3. bluegoatwoods

    bluegoatwoods Well-Known Member

    This is little more than a wild guess, but......

    There are auto parts stores who will test batteries and alternators. Could one of them, maybe, come up with 36 volts plus a few Amps to back it up? That would give you the basic test you need.