What does DC (Direct Current) mean?

Explanation

Direct current is what your EV battery stores and what it needs to charge. DC fast chargers convert AC from the grid to DC inside the charger itself, then send it straight into your battery, skipping the car's onboard charger entirely. This is why DC chargers can deliver much higher power, typically 50 kW to 350 kW.

When you need to charge quickly, such as during a road trip, you look for a DC fast charger. You will recognize them by their larger size, thicker cables (because more power flows through them), and CCS2 or CHAdeMO connectors. The charger screen typically shows charging power in kW, energy delivered in kWh, and your current state of charge.

DC fast charging is harder on the battery than AC charging because of the higher power and heat generated. This is why most manufacturers recommend using DC fast charging only when you need it, and doing your regular daily charging on AC at home or work. That said, modern battery management systems handle this well, and occasional fast charging will not noticeably degrade your battery.

For current specifications, see U.S. Department of Energy AFDC.

Where you'll see this

• On the charger screen
• In charging network apps
• In vehicle specifications

Common confusion

Some drivers think DC fast charging will ruin their battery. Modern EVs manage heat and charging speed automatically. Regular DC fast charging is fine for most drivers, though relying on it exclusively may cause slightly faster degradation over many years.

Example

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