Total Motor Power Explained: kW vs Ps in Cars

[Car Tech Knowledge/ XNmotors]

When shopping for a car or exploring vehicle specifications, you’ll often come across terms like “Total Motor Power (kW)” and “Total Motor Power (Ps).” While these terms are essential for understanding the performance of a car, they can sometimes confuse buyers. This article explains what these terms mean and how they relate to a car’s power output.

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What is Total Motor Power?

In cars, especially electric vehicles (EVs) and hybrid vehicles, “Total Motor Power” refers to the combined output of all the motors powering the vehicle. This measurement gives you an idea of how much power the car’s electric or internal combustion motors can deliver at peak performance.

Why is this important?

More motor power usually translates to better acceleration, faster speeds, and smoother handling, especially for performance-oriented vehicles.

 kW (Kilowatts): A Standard Unit of Power

 • kW (kilowatts) is the SI (International System of Units) standard for measuring power, which includes both electric motors and combustion engines.

 • 1 kW is equivalent to 1,000 watts of power.

 • In the automotive world, kW indicates how much energy is being used or generated per second.

For Example:

If a car’s motor has a total power of 100 kW, it means it can deliver 100,000 joules of energy per second, enabling it to produce significant force for driving the vehicle.

Ps (Pferdestärke): Horsepower in a Different Form

 • Ps stands for Pferdestärke, a German term meaning “horse strength” (similar to horsepower).

 • It was historically used in European countries to measure engine output and remains popular in many markets.

 • 1 Ps is approximately equal to 0.7355 kW.

To Convert kW to Ps:

The formula is:

 Power (Ps) = Power (kW) × 1.36

Example Conversion:

If a motor has a power rating of 100 kW:

100 kW x 1.36 = 136 Ps

This means the car’s total motor power is 136 Ps.

kW vs Ps: Why Are Both Used?

While kW is the modern, globally recognized unit for power, Ps (or horsepower) is more familiar to car enthusiasts and consumers in certain regions, such as Europe and Asia. Many car manufacturers provide both measurements to ensure clarity for a diverse audience.

 • kW is used in technical documentation and by EV manufacturers worldwide.

 • Ps (or hp) is often used in marketing materials, as it resonates better with the average consumer.

Total Motor Power in Electric Vehicles (EVs)

In electric vehicles, total motor power (kW/Ps) refers to the combined output of all electric motors that drive the wheels. EVs with dual motors, such as all-wheel-drive systems, typically have higher total motor power. This figure is critical for understanding an EV’s acceleration capability and overall performance.

For Example:

 • A Tesla Model 3 Dual Motor has a total motor power of approximately 340 kW (462 Ps).

 • This high motor power enables the car to accelerate from 0 to 100 km/h in under 4 seconds.

Why Total Motor Power Matters

 • Performance: Higher total power improves acceleration and speed.

 • Towing Capability: Vehicles with greater motor power can tow heavier loads.

 • Driving Experience: More power ensures smoother overtaking and responsive driving.

Conclusion

Understanding Total Motor Power (kW) and Total Motor Power (Ps) helps you gauge a car’s performance. Whether it’s a combustion engine or an electric motor, these measurements give a clear idea of the car’s capabilities. Always check both units—kW for precision and Ps for familiarity—to make an informed decision when buying your next car.

By knowing how to convert between the two, you’ll easily compare cars across global markets and pick the one that best suits your needs.

( Article / XNmotors Sarah )