The total battery capacity of an EV is measured in kilowatt-hours kWh or kW-h. This rating tells you how much electricity can be stored in the battery pack.
It's a unit of energy just like calories and one kWh is equal to kilojoules or 3. Unlike kW it is not a unit of power.
The Porsche Taycan Turbo S meanwhile stores a maximum of If all these cars had the same electric motor and thereby the same maximum amount of power drawn from the battery at any given time the Porsche would have the longest range because of its higher capacity. However, the Porsche has a kW motor that's designed for high performance and that comes at the cost of range, which is about km.
The complication comes because some car makers describe how good their cars are using one, the other, or sometimes both. In basic terms, kWh kilowatt hours is a gauge of energy or how much fuel is contained within something, like a battery.
Meanwhile kW kilowatts is a measurement of power which is the rate energy is delivered at and is applied to motors. Using the latest Nissan Leaf as an example: the 40kWh Leaf has an official range of miles; the 62kWh Leaf-e has an official range of miles.
This is because the Leaf-e can store more energy in the cells of its battery. As a term of power, the more kW an electric motor has, the more powerful it will be and the faster a car will accelerate.
As an example, kW equals hp. Torque is real, horsepower is abstract. In the real world, horsepower is what makes a car go fast, torque is what makes it feel fast.
Generalising again, race cars work best with high-horsepower engines for acceleration while off-road four-wheel-drive thrive on torque for hauling them through bog-holes and over logs. First Name:. Email address:. Power is torque x revs. But it also puts the spotlight on the importance of torque. Diesel grunt feels great … and grunt means torque. Turbos increase mid range torque. The Honda made big power at big revs.
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