Charging time = battery capacity / charging power

The charging time of new energy vehicles mainly depends on the battery capacity of the vehicle and the charging power of the charging pile. The larger the battery capacity, the stronger the battery life and the longer the charging time required. Specifically, the unit of battery capacity is kWh, and 1kWh is one kilowatt-hour of electricity. The charging power of the charging pile is equivalent to how many kilowatt-hours of electricity can be charged in one hour. The greater the charging power, the faster the charging speed and the shorter the charging time required. Ideally, the approximate charging time can be calculated by dividing the battery capacity by the charging power.

At present, the most common public charging piles are DC "fast charging", and the charging power is mostly 120kW or 180kW, which means that the charging pile can charge the car 120 kWh or 180 kWh per hour. The home charging piles are mainly AC charging piles, which is what we usually understand as "slow charging", which can charge up to 7 kWh of electricity for new energy vehicles in one hour. Taking Tesla model 3 as an example, its electric capacity is 50kWh (50 kWh), and it takes about 7 hours to charge from 0% to 100% at rated voltage (50÷7=7.1). However, considering the influence of the actual charging environment temperature such as severe cold and heat, the time required for full charging will also vary, and the deviation is about 2 hours.