kilowatt hour (kWh)

The kilowatt-hour (kWh) is a unit of measurement for energy . It indicates how much electrical energy is consumed or stored when a power output of one kilowatt (kW) is used for one hour .

What exactly does kilowatt-hour mean?

One kilowatt hour corresponds to:

1,000 watts of power for 1 hour
or, for example, 500 watts for 2 hours

Important:
The kilowatt-hour does not measure power , but rather the amount of energy that is converted or stored.

For e-bikes, the kilowatt hour describes the battery capacity and is therefore a key factor for the range .

Typical battery sizes:

400 Wh (0.4 kWh) – compact batteries for short distances
500 Wh (0.5 kWh) – standard for many e-bikes
625–750 Wh (0.625–0.75 kWh) – for long tours and plenty of support

The higher the kWh rating, the more energy the battery can store – and the longer the motor can provide assistance.

Relationship between kWh, range and consumption

The actual range of an e-bike depends not only on the kilowatt-hour, but also on:

Support level
Driver weight
Terrain (flat vs. mountainous)
Cadence
Tire pressure and wind

A rough guideline:

Depending on conditions, 1 kWh of energy allows for a driving range of approximately 80–200 kilometers.

kilowatt hour and electricity costs

The kilowatt hour is also used to bill electricity costs .
Example:

An electricity price of €0.35 per kWh
An e-bike battery with 0.5 kWh
Cost per full load: approx. €0.18

This makes the e-bike one of the most cost-effective means of transportation available.

Distinction: kW vs. kWh

Kilowatt (kW) → Power (how hard something works)
Kilowatt hour (kWh) → Energy (how much is consumed or stored in total)

In the e-bike sector:

The motor's power is specified in watts or kilowatts.
The battery capacity is specified in watt-hours or kilowatt-hours.

Conclusion

The kilowatt-hour (kWh) is a key metric for e-bike battery capacity . It significantly determines range, operating time, and charging costs. Anyone wanting to compare or realistically assess e-bikes cannot ignore the kWh rating.

pedal power

Big Bike

Published: February 9, 2026 | Updated: February 9, 2026

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