35+ Mile Electric Bicycle DIY

Discussion in 'Electric Bicycles' started by pollution, Jun 22, 2008.

  1. pollution

    pollution New Member

    I am hoping to build a 35+ Mile electric bicycle for my daily commute to work and school.

    I have some parts laying around.
    The box bikes don't have what I need.

  2. eljefino

    eljefino Member

    Is this a question or a statement?
  3. pollution

    pollution New Member

  4. BSA

    BSA Guest

    Please make posts that make sense. We are not mind readers. What is it exactly that you want to know?

  5. oldschool

    oldschool New Member

    yes, it can be done, but range is heavy.
  6. Range depends on many things.
    Among them:
    1.Batteries. The new lithiumFePo4 are pretty safe and will give you more range at low weights and with less space needed compared to sealed Lead acid batteries(SLA) and/or other kinds of batteries. In lithium choose batteries with the highest Ampere-hour(AH) capacity per cell; and per pack(an arrangement of cells in series and paralel for an specific voltage and amp-hour capacity), for the size, weight and voltage you are looking for.
    If recharging is an option at work, you might prefer those bateries and chargers that accomplish full charge in couple hours(2-5hours). Not all Lithium are the same. Some batteries are supplied with chargers and cell balancers that limit the charge to only slow charge(15 hours+).
    2.Type of motor. A small motor with low amps needs, will take you further, but slower.
    You will need to chose enough power for the hills around your area, since the stall currents are the highest. So the closer you are to the optimun RPMs the less amps will be needed. This is; Too little power available from an electric motor isn't good either if the conditions ask for a lot more from the motor.
    3.Driving habits. The more agressive, the less range.
    4.Wind resistance. The bicycles for the speed record on Human Powered Vehicles are recumbent bicycles inside an aerodynamic shell. A human can only pedal at 3/4hp max. With this low hp, those HPVs achieve speeds above 80mph!!! or in the case of range, I believe well above 35miles if electric assistance is used. An aerodynamic shell would help, or at least a bubble shaped windshield.
    5.Road tires instead of mountain bike tires; and inflated at the correct psi.
    Last edited by a moderator: Jul 12, 2008