The calculation of electric vehicle charging power can be carried out according to the following steps:
1. Determine charging current and charging voltage: Charging power is the product of charging voltage and charging current. For example, if the charging voltage is 48 volts and the charging current is 2 amperes, then the charging power is 48V x 2A=96 watts.
2. Consider battery capacity and charging efficiency: For lead-acid batteries used in electric vehicles, the charging capacity is generally 1.05 times the discharge capacity of the battery. This means that when calculating electricity consumption, the rated capacity of the battery needs to be considered and multiplied by 1.05. The electricity consumption can be calculated using the formula "charging voltage x rated battery capacity x 1.05". But this result represents the total amount of electricity required for the entire charging process, not the real-time charging power.
3. Estimate average charging power: If the total power consumption and charging time are known, the average charging power per hour can be estimated. For example, if the total power consumption is 1.0836 kWh and the charging time is 8 hours, then the average charging power per hour is 1.0836 kWh/8 hours ≈ 0.135 kW, which is 135 watts. But in the actual charging process, the charging power will gradually decrease with the increase of battery power.
The charging power of an electric vehicle is a dynamically changing value, which depends on the charging voltage, charging current, and battery state. When calculating, it is necessary to comprehensively consider these factors. At the same time, the output power of the charger is also designed according to the needs of the battery to ensure that the battery can be charged safely and efficiently.