The charging speed of the electric car charger depends on its power and battery capacity, and generally, the power of the 3A electric car charger is about 360W (3A × 120V). If the charger works continuously for 6 hours, it will provide 6 hours x 360W = 2160 watt-hours of electricity. However, there is a loss of energy during the actual charging process, so the actual charge into the battery will be slightly reduced. For a typical EV battery capacity, the charger's six-hour charging time is usually able to fill about 80% of the charge, or about 1,728 watt-hours of electricity. However, the specific charging speed will also be affected by factors such as battery condition and ambient temperature.