1. Calculate the Battery Capacity in Watt-Hours (Wh):
The capacity of an eBike battery is usually given in ampere-hours (Ah) and voltage (V). To calculate its energy storage in watt-hours (Wh), use this formula:
Capacity:
Capacity (Wh)=Voltage (V)×Ampere-Hours (Ah)
Let’s take our Dalat V1 EBike as an example, the battery specs are:
- Voltage = 48 V
- Ampere-Hours = 15 Ah
Capacity (Wh)=48V×15Ah=720Wh which means the battery has 720 watt-hours of energy.
2. Estimate the Range:
To estimate the range, you need to consider the following factors:
a. Energy Consumption (Wh per mile or kilometer):
The energy consumption depends on various factors like rider weight, terrain, speed, pedal assistance, wind resistance, and tire efficiency. For typical eBikes:
- Energy consumption ranges from 9 Wh/km for efficient riding to 25 Wh/km for higher speeds or tougher terrain.
b. Formula for Range:
Range (km)= Range (km )= Energy Consumption (Wh/km) / Battery Capacity (Wh)
3. Calculating Estimated Range for A Pedal Assist Electric Bike
3.1 Battery Usage by Pedal Assist Modes
To be more specific, we will take Dalat V1 ebike with a 720 Wh battery as an example:
- Mode 1 (Eco): ~9 Wh/km
- Mode 2: ~12 Wh/km
- Mode 3: ~15 Wh/km
- Mode 4: ~20 Wh/km
- Mode 5 (Power): ~25+ Wh/km
This means:
- Mode 1 is ideal for long-range riding.
- Higher modes (4-5) should be limited to short bursts, like climbing steep hills or overtaking.
3.2 Efficient Riding Plan for 80 km Range
- Use Pedal Assist Mode 1 as the Default:
- Energy consumption in Mode 1 is ~9 Wh/km.
- Riding in this mode consistently can achieve the desired range of 80 km.
- Switch to Mode 2 Sparingly:
- On slightly tougher terrain or mild inclines, use Mode 2 briefly.
- Be cautious, as Mode 2 consumes ~12 Wh/km and reduces the range if used excessively.
- Minimize Use of Modes 3-5:
- Avoid Modes 4 and 5 unless absolutely necessary (e.g., climbing a steep hill or accelerating in traffic).
- These modes consume significant power (~20-25+ Wh/km), drastically reducing range.
- Balance Pedal Power:
- Actively pedal in all modes to reduce motor load.
- The more you pedal, the less energy the motor consumes.
3.3 Key Tips for Riding with Modes:
- Stick to Mode 1 for flats and downhills.
- Use Mode 2 for moderate inclines.
- Reserve Modes 3-5 for steep climbs or quick acceleration.
- Actively pedal, especially in higher modes, to extend the battery life.
By carefully managing the pedal assist modes as outlined, you can maximize efficiency and achieve the 80 km range.