Which is faster for charging new energy vehicles, DC or AC?
2 Answers
When comparing DC and AC charging for new energy vehicles, DC charging is faster. This is because AC charging has a lower power output, resulting in longer charging times, but it causes less battery wear. In contrast, DC charging stations offer higher power output, enabling faster charging, but they also cause greater battery wear. The differences between AC and DC charging: AC charging stations require an onboard charger to charge the vehicle, while DC fast charging stations do not need this equipment. There is a significant difference in charging speed between the two. For example, a fully discharged pure electric vehicle (with standard battery capacity) takes about 8 hours to fully charge using an AC charging station, whereas a DC fast charging station can achieve the same in just 2 to 3 hours. Key precautions for charging electric vehicles are as follows: Master the correct charging time: Replenishing energy for pure electric vehicles takes longer. If using a home charging station, it takes nearly 8 hours to fully charge. Even with a fast charging station, it takes about 40 minutes to reach 80% capacity. It's important to develop a regular charging habit and avoid waiting until the battery level is too low before charging. Avoid overcharging or deep discharging the battery: Both overcharging and deep discharging can reduce battery lifespan. This applies to any product that uses batteries, including pure electric vehicles. Although battery packs are equipped with protection systems, frequently driving until the "red light" warning appears will inevitably affect the battery pack's longevity. Additionally, charging should be stopped immediately once the battery is full, similar to how you would charge a smartphone.
From my experience studying electric vehicles, DC (Direct Current) charging is faster for new energy vehicles because it delivers high-power current directly from the charging station to the battery without needing onboard conversion. In contrast, AC (Alternating Current) charging first requires conversion to DC via an in-car device, making it much less efficient. DC charging can typically replenish 80% of the battery in around half an hour, making it ideal for highway rest stops or urgent trips, whereas AC charging takes six to seven hours and is mainly convenient for home charging stations. The key difference lies in power: DC stations can deliver over 100 kW, while AC stations max out at around 22 kW. Battery health is also a consideration—frequent use of DC fast charging may impact longevity, so I recommend reserving fast charging for emergencies and using slow charging for daily use to preserve value. Many new charging stations now support DC, and the expanding charging network makes finding stations easier.
