Why the actual charging time of electric vehicles is longer than the manufacturer's data

After the new energy vehicles were promoted by the country for several years, the public has a better understanding of charging piles, which are mainly divided into two categories: fast charging and slow charging. Generally, we only know that AC charging piles have low power and slow charging, which are suitable for home use; DC charging piles have high power and fast charging, which are mostly used in public places. After the electric car owners start charging their cars, they will find that the actual charging time of the vehicle is longer than the charging time provided by the manufacturer, especially for household electricity, which often requires more than ten hours to charge.

In fact, the charging time data given by the manufacturer is subject to certain prerequisites. Excluding vehicle problems, there are several key factors that affect the vehicle's charging efficiency: vehicle performance, battery capacity, charging pile power and voltage. But how do they affect the charging efficiency of electric vehicles?

First of all, the battery capacity. It is easy to understand that the larger the battery capacity, the longer the charging time. For example, the battery capacity of Tesla Model 3 is 80kwh, while the battery capacity of BYD Yuan EV360 is only 43kwh. When using a 3.3kw home charging station, the former takes 20 hours and the latter takes 10 hours.

Secondly, the charging pile power and vehicle charging power. Using a 7kW AC pile to charge the Geely EV300 with a charger power of 6.6kW, the actual power is only 6.6kW. Therefore, the greater the charging pile power, the higher the maximum current and the shorter the charging time.

The unstable charging power of the charging pile is the most common reason why car owners encounter charging time exceeding the standard charging time.

Theoretical charging time: battery capacity/charging power = charging time, but in reality, battery capacity/average charging power = charging time. For example, the battery capacity of Tiggo 3xe 480 is 53.6kWh, and when it is charged with a 7kW AC pile, the average charging power is 6kW. Therefore, in theory, it is 53.6kWh/7kW=7.6h, but in reality it is 53.6kWh/6kW=8.9h.