AC or DC Charging? How Fast Charging Affects an Electric Car's Battery

Should you choose AC or DC when charging your electric car? Fast charging (DC) can be convenient on long journeys, but destination charging (AC) is the real everyday hero. Qwello deliberately focuses on smart AC charging – here, we explain why it is better for both your car and the environment.

When it comes to electric car charging, it is easy to assume that faster is always better. But the truth is that the two technologies serve different purposes.

• DC charging (Direct Current): Delivers large amounts of energy to the battery in a short time. Perfect when you are travelling along the motorway and need to get back on the road quickly.

• AC charging (Alternating Current): Charges the car at a slower, more natural pace while it is parked anyway – for example at work, at a shopping centre or on the street outside your home.

How does AC charging affect battery life?

Fast charging with DC puts significantly more strain on an electric car’s battery. The high power output generates a great deal of heat, which over time can accelerate battery ageing and reduce its capacity. AC charging, by contrast, is like gently charging your phone overnight. By charging at a slower pace, you help preserve the battery’s lifespan – which is better for both your wallet and the environment.

The sustainability benefits of AC charging over fast charging

Sustainability is about using resources wisely. Building and operating large DC fast chargers requires many components, heavy use of rare metals and extremely high power from the electricity grid.

• Less material required: AC stations require fewer heavy components and rare metals in manufacturing.

• Lower grid load: Does not place sudden, enormous peaks in demand on the local electricity grid.

• Better use of resources: Enables charging over longer periods when renewable energy is most available.

Convenience where you already are

Since an electric car is parked 95% of the time on average, it makes most sense to charge it where it is already parked. By providing reliable AC charging at strategic locations in your everyday life, you avoid having to make detours just to fast charge. It is convenient for you, gentler on the battery and better for the planet.