What is the difference between AC and DC charging?

If you have a fully electric or plug-in hybrid car, you have probably encountered the terms AC charging and DC charging. But what do they really mean, and what is the difference? We will explain the differences, as well as the advantages and disadvantages, so you can understand how each system works.

What is AC charging?

AC charging, or alternating current charging, is the most common method for charging electric cars and the system you use when charging your car at home. Since the power needs to be converted during AC charging, it will take longer to charge your car than with DC charging. Depending on factors like the charging box, battery size, and car model, you can expect it to take between 6-12 hours to fully charge your fully electric Volvo car with AC charging when using a charging box.

How AC charging works AC charging involves converting the alternating current from the power grid via the car’s onboard charger (OBC) into direct current (DC), which is stored in your car's battery. The charging speed for AC is measured in kilowatts (kW), and most electric cars can be charged at a speed of up to 11 or 22 kW. AC charging is common at homes, but can also be found at public charging stations and workplaces. When charging your electric car at home overnight, it may be advisable to do so when electricity prices are typically lower. Advantages of AC charging

• Ideal for home use: AC chargers or wallboxes are almost exclusively offered for private use if you live in a house.
• Cost-effective: Installing a charging box at home does not have to be expensive or complicated. However, a certified electrician must do the job.
• Smart features: Most charging boxes, including the Volvo wallbox, come with smart features allowing you to schedule your car's charge via your mobile phone.

• Slower charging speeds: Compared to DC charging, AC charging has slower charging speeds. Speed may not be a significant concern if you are charging your car overnight, but it's worth considering if you ever need a fast charge, for example, during long trips.

• Fast charging: DC charging offers much faster charging speeds than AC charging, making it a great option when you need to recharge your car's battery while on the go.
• Growing number of charging stations: The number of charging stations has increased significantly in recent years, and the network continues to grow as more fully electric cars hit the roads.

• Higher cost: Charging your car at a DC station is faster but often more expensive than AC charging at a public station or at home.