### Comments - 12

Dibakar Deb

2018-08-01 12:38:42

Can you share the calculations?

Shoji

2018-05-06 08:03:41

Can you mention the formulas for all of the above calculations please

Indranil

2018-05-06 06:44:57

Dear Bartek,

Can you please share with me the formula/algo for calculating power required for an ebike taking into account rolling friction and air resistance please

Thanks,

Indranil

Can you please share with me the formula/algo for calculating power required for an ebike taking into account rolling friction and air resistance please

Thanks,

Indranil

Usman

2017-12-21 17:48:07

Will you please tell me the formula of these calculations..i will b very thankful to you.

Ashok

2017-09-26 12:24:58

When I using 250 watt bldc motor ., but I wish the maximum speed is 45km/h. What can I do. Please answer

Bartek

2017-05-18 09:17:15

Dear Ricky

Here you have calculation to reach 140km/h:

http://www.electricbikesimulator.com/calculator.php?language=en&speed=140&range=100&weight=400&voltage=12

I think you need engine with a motor rated at a minimum of 20kW

Exact calculations are complex. In the comments under the simulator you have an exact formula for calculating rolling and air resistance.

Here you have calculation to reach 140km/h:

http://www.electricbikesimulator.com/calculator.php?language=en&speed=140&range=100&weight=400&voltage=12

I think you need engine with a motor rated at a minimum of 20kW

Exact calculations are complex. In the comments under the simulator you have an exact formula for calculating rolling and air resistance.

Ricky

2017-05-17 10:07:02

Dear Bartek

How to calculate the Power of the motor?

As i am planning to increase the speed of the motorcycle to 80 to 140kmph.

So kindly explain how to calculate.

How to calculate the Power of the motor?

As i am planning to increase the speed of the motorcycle to 80 to 140kmph.

So kindly explain how to calculate.

Bartek

2017-04-20 08:32:56

Roman Van Loo

This calculator does not matter the size of the wheel.

Smaller wheel - lower speed - lower power required

This calculator does not matter the size of the wheel.

Smaller wheel - lower speed - lower power required

Bartek

2017-04-20 08:31:08

Ricky

Watt hr / km - This parameter is shown in the simulator in the lower window.

In free time I will try to update the calculator so that the coefficients of resistance can be changed and to show the energy consumption wh / km

Air resistance = 0.5 * 1.226 * Aerodynamics coefficient * Face surface * ( Speed ) up to third;

Rolling resistance on flat = Weight * Rolling coefficient * Acceleration of the earth

* Speed;

Rolling resistance on a hill = ( Weight * cos(tan(Angle of a hill

/ 100)) * (Rolling coefficient + tan(tan(Angle of a hill / 100))) ) * Acceleration of the earth * Speed ));