Many of us are not familiar with the motor wattage and battery voltage. Today let’s talk about their relationship.
The battery voltage and the motor wattage are related by the formula:
Wattage = Voltage x Current
This means that the power output of the motor depends on the voltage supplied by the battery and the current flowing from the battery to the motor. For example, a 36V battery and a 15A controller equate to an e-bike motor with a 540W output.
The higher the wattage of the motor, the more battery voltage is required to reach full power. A higher voltage also means more power and speed for longer. However, a higher voltage requires fewer amp-hours to achieve the same total watt-hour output, which is the measure of the energy capacity of the battery. For example, a 48V 10Ah battery has the same watt-hour (480Wh) as a 36V 13.3Ah battery.
The optimal combination of battery voltage and motor wattage depends on your riding style, terrain, and budget. Generally, most e-bikes use a 36V or 48V battery and a 250W to 1000W motor. Higher voltage and wattage are more suitable for off-road or hilly riding, while lower voltage and wattage are more efficient and economical for urban or flat riding.
More information and guidance are:
- 1 E-Bike Batteries 101 — All You Need To Know — Bikexchange
- 2 Electric Bike Batteries Explained — Charging, Weight, Size + Range …
I hope this helps you understand the relationship between battery voltage and motor wattage for e-bikes.
