This is because the formula for calculating the power (P) in kilowatts (kW) is given by:

P (kW) = voltage (V) x current (A) / 1000

If we set the power (P) equal to 22 kW and keep the voltage (V) constant (for example 400V for a three-phase system), we can rewrite the formula to calculate the current (A):

22 (kW) = 400 (V) x A (A) / 1000

A = 22 (kW) x 1000 / 400 (V) = 55 A / 2 = 27.5 A per phase (for three-phase systems)

Since electric vehicles often use three-phase charging systems, the total current is distributed over three phases, resulting in a current of approximately 27.5 A per phase.

It is important to note that the specific current requirements may vary depending on the charging system, vehicle specifications, and available infrastructure. It is advisable to consult the manual of your electric vehicle and the charging equipment for the exact current requirements.