At its most basic, an EV charger pulls an electrical current from either a 240v outlet or the grid it's hardwired to and delivers that electricity to the vehicle, just like any other appliance or device you charge by plugging into the wall. The EV Chargers can be devided into many different types according to different models such as DC Ev Charger, AC EV Charger, etc. And besides, some other device like EV Charging Power Box, DC Charging Stacks and EV Connectors are all indispensiable for an EV. http://www.evchargerchina.com/ev-charging-power-box/