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2017 mpg challenge. Win $20 riding your bike!

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  • commuter ebikes
    replied
    My 18.4 lb. battery propelled me 19.19 miles. My average speed was 29.0 mph. At that point, the LVC (65V) in my CA came into play so I was cut off. I stopped, recorded my stats, unplugged and plugged back in the battery, put the 3-speed switch into low and rode home very slowly.

    I consumed 17.709Ah of the 19.8Ah battery. My max speed was 41.7 mph, my max current was 47.8A, and my average Wh/mi was 62.4.

    http://www.wolframalpha.com/input/?i=19.19mi%2F18.4lb, or 3.70 meters per gram of battery weight (mpg) for Class 2.
    Last edited by commuter ebikes; 04-06-2017, 12:31 AM.

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  • commuter ebikes
    replied
    Originally posted by TheRammer View Post
    http://www.wolframalpha.com/input/?i=29mi%2F4lb
    From yesterday's commute: 29.0miles at 15.0mph with 4lb battery = 25.7 mpg
    FWIW, 250W front hub motor w/24V*10ah=240Wh battery.
    Usually would be closer to 17mph, but headwind both ways and broke a spoke.
    According to the link, the m/g is a value for "inverse linear mass density".

    What sparked my interest in this is the question "My 20 lb. battery can get me how far?"

    Having a battery with a lightweight chemistry would be an advantage in this challenge.
    Last edited by commuter ebikes; 04-05-2017, 07:27 AM.

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  • TheRammer
    replied
    Wolfram|Alpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.

    From yesterday's commute: 29.0miles at 15.0mph with 4lb battery = 25.7 mpg
    FWIW, 250W front hub motor w/24V*10ah=240Wh battery.
    Usually would be closer to 17mph, but headwind both ways and broke a spoke.

    Leave a comment:


  • 2017 mpg challenge. Win $20 riding your bike!

    There will be three winners: 15-24.99, 25-34.99 and 35-75 mph average speed. Each winner will win $20.00 cash, money order or PayPal.

    mpg is meters per gram or km/kg of battery weight. Most people will weigh their battery in pounds, measure the distance in miles, and then convert it to km/kg or m/g. mpg!

    Just load up like you normally do and ride like you normally ride until your system stops you. Hopefully, you will begin and end at the same altitude.

    It would go against the idea of the challenge to substitute in a lighter rider, choose a downhill route, carry less gear than you normally do, pedal more than you normally do, use your battery more "hot off the charger" than you normally do, turn your current down more than you normally do, choose a route with the wind at your back, etc. Ask yourself "How do I normally ride?" and then ride like that!

    As soon as April 2017 ends, so does the challenge. Enter as many times as you like and post your results here. Remember to note your average speed so that you know which class you are in.

    Each winner will also win a small but prestigious "2017 mpg challenge Class x Winner" sticker to put on your bike or workbench.

    My system will stop me when the BMS no longer wants to allow the 20-30A current that I draw. I could stop, power cycle the battery and then continue on more slowly. Don't do that. When your system stops you, you are done. Note distance travelled and average speed.

    Honor system applies. Have fun!

    Last edited by commuter ebikes; 04-05-2017, 01:37 AM.
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