How long to fully charge a car? A: To know how long to charge a car, you need to know the OBC(on board charger) power of the car, the car battery capacity, the charger power. The hours to fully charge a car =battery kw.h/obc or charger power the lower one. For e.g, the battery is 40kw.h,obc is 7kw, charger is 22kw, the 40/7=5.7hours.Descption:Lu., established in March 2010, with a registered capital of RMB 20 million, is a professional high-tech enterprise engaged in the research, development, manufacturing, sales and services of new-energy electric vehicle charging equipment and products.SGC focus on the development and manufacturing of EV charger and charging operating platform with wide range of products, which covers AC & DC chargers from 7KW to 300KW, etc. SGC has core development capability of intelligent control, the internet of things and so on. SGC has been specialized in experience accumulation of technical development ...China Fast Charging Station 7kw for EV Car, Find details about China Charging Pile, AC Charging Pile from Fast Charging Station 7kw for EV Car - Zhejia.