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What size cable is needed for 22kW EV charger?

What size cable is needed for 22kW EV charger? For a 22kW ev charger, the required cable size mainly depends on the power and voltage of the charging device and the current that the cable needs to carry. The following is an introduction to the size of the cable required for a 22kW ev charger:

1. Considerations based on charging power and voltage

1.1. Charging power: 22kW

1.2. Power supply voltage: usually 380V (three-phase electricity)

The required current can be calculated using the formula I=P/U (where I represents current, P represents power, and U represents voltage):

I = 22000W / 380V ≈ 57.9A (the actual current may vary slightly due to equipment efficiency and voltage fluctuations)

2. Cable size selection

2.1. General selection: 

According to general experience, a 6 square millimeter copper wire can safely carry a current of about 60A at room temperature. Therefore, a 6 square millimeter copper wire is a suitable choice, which can meet the needs of a 22kW charging power and reserve a certain amount of space for future power increases.

2.2. Special cases:

2.2.1. Pipe laying: If the cable needs to be laid in a pipe, the current carrying capacity of the cable will be reduced due to the effect of the pipe on heat dissipation. In this case, it may be necessary to select a larger cable, such as 10 square millimeters of copper wire, to ensure the safe load of the cable.

2.2.2. Cable length: When the cable is longer, the resistance will increase, resulting in an increase in voltage drop. In order to maintain the voltage stability at the charging pile end, it is necessary to select a cable with a larger cross-sectional area and lower resistance. Therefore, if the cable length is long (for example, more than 50 meters), you should also consider choosing a larger cable.

3. Recommended cable size

3.1. Basic recommendation: For a 22kW ev charger, it is recommended to use at least 6 square millimeters of copper wire for power connection.

3.2. Recommendation for special cases: If the cable needs to be laid in a pipe or the cable length is long, a larger cable, such as 10 square millimeters of copper wire, should be appropriately selected.

If you want to know more about "What size cable is needed for 22kW EV charger?" You can consult us online by email (sales@hjlcharger.com).