7kW vs 11kW vs 21kW — Which to Choose?
Choose the right charger power based on your vehicle, power supply, and charging needs
7kW
220V 单相
Best for: Most home scenarios. Overnight slow charge (8-10 hours) fills the battery.
Requires: Standard single-phase meter is sufficient. No need for 380V.
Most common home charger power level. Easiest installation requirements.
11kW
380V 三相
Best for: Users whose vehicle supports 11kW and need faster charging.
Requires: Requires 3-phase 380V power supply. Some communities may not support it.
Vehicle must support 3-phase charging to benefit; otherwise actual power remains 7kW.
21kW
380V 三相
Best for: High-capacity battery vehicles or specific brand requirements.
Requires: Requires 380V with sufficient capacity. Strict installation conditions.
Uncommon for home use. Confirm both vehicle and community support.
Selection Guide
| Scenario | Recommended |
|---|---|
| Standard home, single-phase meter, overnight charging | 7kW |
| Vehicle supports 3-phase, 380V available or can be applied for | 11kW |
| Large battery vehicle, strict charging time needs | 21kW (confirm conditions) |
| Unsure if vehicle supports 11kW | Start with 7kW, upgrade later |
FAQ
My car doesn't support 11kW. Is an 11kW charger useful?
No. Charging power depends on the vehicle's onboard charger. If your car only supports 7kW, an 11kW charger will still charge at 7kW.
Can I install 11kW on single-phase 220V?
No. 11kW chargers require 3-phase 380V power. With single-phase 220V, the maximum is 7kW.
Is 21kW suitable for home use?
Most homes don't need 21kW. Unless your battery is very large (80+ kWh) and you need fast charging, 7kW or 11kW is sufficient. 21kW has stricter capacity and installation requirements.