The power required for home charging of new energy vehicles should be determined based on the vehicle's battery capacity and the type of charging station. The following details are provided:
Power and Charging Efficiency of Mainstream Home Charging Stations
Taking a Shangyiyuan 7kW AC charging station as an example, if the vehicle's battery capacity is 45 kWh, the theoretical charging time is:
{Charging time} = {45 kWh}{7 kW}} approx 6.4 hours}
During actual charging, due to cable heat loss (e.g., using 4-square-meter cable for 5-60 meters), the actual charge received by the vehicle may be slightly lower than the theoretical value, but the overall error is within an acceptable range.
Power Selection Recommendations
7kW AC charging station: Suitable for most home use scenarios, with stable charging efficiency, suitable for long-term overnight charging.
Higher Power Options: If your vehicle supports fast charging (e.g., some models support 11kW or 21kW), you must confirm the grid capacity and install the appropriate cable (e.g., 5 square meter cable is required for distances over 60 meters).
Cable Specifications and Distance Relationship
5-60 meters: 4 square meter cable (minimum standard)
60-100 meters: 5 square meter cable
Over 100 meters: Not recommended (large voltage drop affects charging efficiency)