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Ebike Battery Pack Calculator
  • 2021-08-14
  • Editor: EVOLT

The ebike battery pack calculator is fairly simple, using the following Fomula:

Battery Capacity Required (Wh) = Power Demand per distance traveled (Wh / mile or km) x Typical Distance Traveled (miles or km)

Calculation ebike battery would be quite complex as the motor output is changing all the time,ie related watt-hour demand (Wh / mile or km) of the motor is changing all the time, to list a few factors below:

A Light Driver VS heavy player
B Flat Terrain VS Hilly Terrain
C Continuous Riding VS Frequent Start (Start consumes more power)
D Summer VS Winter

To help less hassle for your calculation, below is our table for your general reference

Constant Riding, 9-12 Wh/km (14-20 Wh/mile)
Frequent Start, 14-20 Wh/km (22-33 Wh/mile)

Let’s use actul example to explain

For a 48V ebike that we want a minimum of 30 km riding range.
that’s 10 wh/km* 30km=300wh (it ranges from 9-12wh/km, we here use 10wh/km as example)

we already know that
Watt-Hour (Wh) = Amp-hours (Ah) x Volts (v)

So that’s 300Wh/48V=6.25Ah

  • What is the most important factor to consider when designing a 18650 battery pack?
  • We think the first important factor to consider battery size constraint, size limitation will decide which battery cell to choose from, a 18650 cell is a standard battery cell with 18(C)*65(H)mm in size, people will need to choose lithium polymer battery cell if size limitation of thickness less then 18mm like 10mm.

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