Generally, new energy vehicles are equipped with two charging ports: one with seven pins and one with nine pins. Many people classify them as "slow charging" and "fast charging" types, but aside from the difference in charging speed, what are the specific differences between the two?

1.Difference between AC and DC charging:

1.AC Charging Station: Commonly known as "slow charging," it converts the AC power from the grid into DC power, which is then fed into the vehicle’s battery via the onboard charger.

2.Charging speed is relatively slow, often taking 6-9 hours to fully charge.

3.Power is typically around 7 kW, with the maximum power in China reaching about 21 kW.

4.The charging station is small in size, and the connector is usually seven pins.

5.It is suitable for locations where the vehicle stays for long periods, such as homes, communities, shopping malls, or parking lots.

6.The cost is relatively low, and the construction and maintenance costs are more affordable.

7.DC Charging Station: Commonly known as "fast charging," it provides DC power directly to the vehicle’s battery, bypassing the need for the onboard charger.

8.Charging speed is fast, typically taking 1 to 2 hours to complete the charging process.

9.Power ranges from 50 kW to 350 kW.

10.It contains more internal modules, making it larger in size, and the connector is usually nine pins.

11.It is commonly used in urban public charging facilities and charging stations along highways for long-distance travel.

12.Due to its larger size, more modules, and thicker cables, the DC charging station has a higher cost, with higher construction and maintenance expenses.

2.Advantages and disadvantages of each type:

AC (slow charging) charging stations and DC (fast charging) stations each have their own pros and cons. When choosing a charging station, it's important to match it with actual needs and the usage scenario.

AC (Slow Charging) Station:

Lower cost: Due to the simple converter and the fact that most of the power conversion happens inside the vehicle’s onboard charger, AC charging stations are generally less expensive than DC stations.

Simple installation and maintenance: The smaller size and lower ground load requirements make AC charging stations easier to install in personal residences, commercial buildings, etc.

Wide compatibility: Almost all electric vehicles support AC charging, making AC charging stations widely applicable.

However, the charging efficiency is relatively low, usually taking several hours to complete. This type of charging is more suited for home use or locations where the vehicle is parked for extended periods.

DC (Fast Charging) Station:

Fast charging speed: The most significant advantage is the quick charging speed. For consumers who need to rapidly recharge, DC charging stations can charge an electric vehicle to about 80% within 30 minutes, greatly improving charging efficiency.

Efficient power conversion: Since the power conversion happens inside the charging station, it reduces transmission losses and improves charging efficiency.

High level of automation: DC charging stations are typically equipped with more advanced control systems and user interfaces, providing more functions for charging management and payment.

The main disadvantage is the higher cost and stricter installation and maintenance requirements. As a result, DC charging stations are more commonly found in public charging stations and fast-charging networks.

3. How to choose:

To select the appropriate charging station type, consider the following factors:

Charging speed requirement: If you often need rapid charging, a DC charging station is more suitable. However, if most of the time the vehicle is parked at home or work, an AC charging station would meet your needs.

Installation site requirements: Given the installation costs and the charging station's adaptability to the environment, personal residences and small businesses are better suited for installing AC charging stations.