Explanation
When you see "150 kW DC" in a car's specifications, it means the car can accept up to 150 kilowatts of direct current power from a fast charger. This is the number that determines how quickly your car charges on a road trip. The higher the kW DC rating, the less time you spend waiting.
kW DC combines two concepts. kW (kilowatts) is a unit of power that measures how fast energy flows. DC (direct current) is the type of electricity that fast chargers deliver straight into your battery, bypassing the car's slower onboard charger. Together, "kW DC" tells you the maximum speed your car can handle when plugged into a DC fast charger.
Your car's kW DC rating is a maximum, not a guarantee. Actual charging speed depends on battery temperature, state of charge, the charger's own power limit, and whether other cars are sharing the same charger. A car rated at 150 kW DC might only reach that speed between 10% and 40% battery, then taper down. In cold weather, it might start even lower. The number on the charger screen shows what is actually happening, not the theoretical maximum.
Where you'll see this
- In vehicle specifications
- On the charger screen
- In charging network apps
Common confusion
Drivers sometimes assume a car rated at 150 kW DC will always charge at 150 kW. In practice, the car controls the speed and it varies throughout the session. The rating is the peak, not the average. Also, plugging a 150 kW DC car into a 350 kW charger will not make it charge faster than 150 kW.
Example
A Volkswagen ID.4 is rated at approximately 135 kW DC. On a 150 kW charger, it charges from 10% to 80% in roughly 28 minutes. On a 50 kW charger, the same charge takes about 55 minutes because the charger is the bottleneck, not the car.
Related terms
See a term you don't recognize? Scan it.
Point your phone at any charger screen. Free to try on iOS.
From Finn, engineer: Understanding charging terminology helps you troubleshoot faster at the charger. These definitions are based on industry standards and our consulting work with automotive manufacturers.
The EVcourse app provides instant troubleshooting and expert explanations at the charger. Scan any station or car screen for step-by-step help, free to start on iOS.
Don't understand the screen? Scan it.
Point your phone at any charger or car screen for instant help. Any brand, any language. Free to try on iOS.
Free to try on iOS. Android coming soon. Join the Android waitlist.