What does Peak Power mean?

Explanation

Peak power is the highest number of kilowatts your car can draw from a DC fast charger. Car manufacturers advertise this figure prominently, and it is the speed you see in headlines like "charges at up to 270 kW." But it is important to understand that your car only hits this number briefly, and only under ideal conditions.

To reach peak power, several things need to align: your battery must be at a low-to-mid state of charge (usually 10-30%), the battery must be at optimal temperature (not too cold, not too hot), and the charger itself must be capable of delivering that much power. If any of these conditions are not met, your actual speed will be lower.

You can see the current power on the charger screen during a session. Watching it climb to peak and then gradually taper down gives you a real sense of your car's charging curve. When comparing EVs, pay more attention to the average charging speed from 10% to 80% than the peak number. A car that peaks at 200 kW but holds it for a long time beats a car that peaks at 250 kW but drops immediately.

This standard is maintained by National Renewable Energy Laboratory.

Where you'll see this

• On the charger screen
• In vehicle specifications
• On your car dashboard

Common confusion

Advertisements show peak charging speed, but your car will not sustain that speed for the entire session. Peak power is typically reached only at low SoC and held briefly.

Example

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