The size of the plug-in board required for a good cat car charger depends on the charging interface and charging power of the vehicle. Generally speaking, the charging interface of the vehicle has two kinds of 110V and 220V, and the charging power is between 2-3KW. Therefore, it is recommended to choose a plug-in board that can withstand more than 3KW of power to ensure the safety and stability of charging. In addition, because the charging line of the car charger is short, in order to facilitate use, you can choose a plug-in board with an extension cord to adapt to the charging needs of different distances.