Wednesday, March 21, 2012

Electric bicycle 2.0

Since it is finally getting warm outside again (Yea!) I decided to take out my old electric bicycle and finish everything! There were tons of emails and questions about the bicycle and the motor, so here's a post that'll hopefully answer most of your questions!




Click "Read more" for pictures and further information!


So lets sum up the materials:
I purchased the 300 Watt 24V DC Scooter motor (45€) of ebay. The two 12V 10Ah batteries (35€) came from ebay, too. The power switch was extracted from an old computer power supply.
The bicyle itself is a so called "bone shaker" but works perfectly fine. It was very cheap, too.
 This is one of the two batteries:

This is the motor with a small wooden wheel from a local hardware store:


Here's a picture of the simple on/off switch:


Detailed views of the motor attached to the bicycle in the video:


Facts about the bicycle:
The motor draws up to 16 Ampere when you start the bicycle. 5 to 9 Ampere on normal surface with average speed of 27km/h.
You are allways able to pedal yourself and its not very hard, even if the motor is turned off. I demonstrated it in the video!
The batteries take about 10 hours to charge with an simple 12V charger from ebay. The batteries are a little bit heavy but since they're stored in a bag fixed to the bicycle it is not a problem at all. I can drive about 20 kilometers with one full charge without pedaling. The top speed without pedaling was 36km/h measured with GPS android Sports Tracker. Furthermore the tire does not get flat due to friction from the motor's drive wheel. There's one disadvantage though: It does not work properly in rain, but who wants to go by bike when its raining anyways? All in all it cost about 100 bucks and works perfectly fine! So if there still are questions ask in the comments below I will try to answer them sooner or later!

21 comments:

  1. Was the wooden wheel on end of motor rotor originaly with rubber on it ?

    ReplyDelete
  2. Yes! I got it in a local hardware store where they sold little wheels for containers etc !

    ReplyDelete
    Replies
    1. hey, i need to know how youve attached the wooden wheel to the motor. What was the diameter of the wooden wheel you used? thx :)
      (I've bought a 750W motor, 2500-3500rpm)

      Delete
  3. And motor is 48V ?
    Didn't you think about using car starter instead ?

    ReplyDelete
    Replies
    1. Hallo! The motor is 24 Volts! The thing is that motors about 300Watts with 24 Volts are pretty cheap in contrast to bigger&stronger motors!

      Delete
  4. Is there any way you could post the how-to guide for the bike? This is just amazing! Thank you so much for sharing!

    ReplyDelete
    Replies
    1. I am sorry but I already built the bike, so there is no way i could re-do it! Just watch the video, there you'll see how the motor is attached to the bike!

      Delete
  5. Got it! Glad that I've found this blog. It's really full of helpful information. An electric bicycle is really awesome.


    Fender Flares | Bushwacker | Bestops | Auto Parts and Updates

    ReplyDelete
  6. That looks very interesting to build, might be a summer project....thanks!

    ReplyDelete
  7. Nice build. About range .. I've read somewhere that wind resistance gets exponentially higher than rolling resistance at speeds over 15km/h so staying below 15km/h could significantly increase the range.

    ReplyDelete
    Replies
    1. Thats interesting! Maybe I should try it and collect some Data!

      Delete
  8. Damn, i wish i could build something like this ;(

    I'm a total noob in things like this... i wish someone could give me lessons or stuff, starting with the On/Off-Switch

    ReplyDelete
  9. How's the build work on hills?

    ReplyDelete
  10. Why is there no controler? Would this system work with Lithium ion batteries? I like the symplicity of the design, just would be nice to upgrade on batteries.

    ReplyDelete
  11. Can you please tell me how did you get the motor and the wooden wheel together?

    ReplyDelete
    Replies
    1. The motor had a screw on top of the shaft so I was able to put the wheel on the axis and secure it with a screw!

      Delete
  12. My scooter was non-operational with the new parts and I was beyond burned with the cost of them. I decided it was cheaper to junk the whole thing (which was less than 2 years old) than to risk reordering more wrong replacement parts. electric bikes

    ReplyDelete
  13. Hi this is a really awesome blog! I ride about 40 km every day I do plan on pedaling the entire time but what would you suggest to get more range out of the setup? Also could you explain the wiring (I am a complete newbie)?

    ReplyDelete
  14. what make was the on off switch I thought u would have to use a speed controler but did u run the motor at full speed and tun turn it off please let me know [gojack73@gmail.com

    ReplyDelete