Home AC charging piles are divided into several types:

The mainstream ones are 7kW, 11kW, and 21kW, which can be simply understood as the charging speed. The greater the power, the faster the charging.

7kW means charging 7 kilowatt hours in one hour, which is approximately equivalent to 40 kilometers.
11kW means charging 11 kilowatt hours in one hour, which is approximately equivalent to 60 kilometers.
21kW means charging 21 kilowatt hours in one hour, which is approximately equivalent to 120 kilometers.

From the perspective of cost performance and ease of installation, 7kW power is enough for ordinary new energy vehicles.