Electric Vehicle 22 kW AC Charger

What is a 22 kW AC Charger?

A 22 kW AC charger is a high-power Level 2 electric vehicle (EV) charging station, typically used for destination charging. It converts Alternating Current (AC) from the electrical grid to Direct Current (DC) to charge the EV's battery, using the vehicle's internal onboard charger for this conversion.

Key Characteristics

1. Power Rating: 22 Kilowatts (kW)

This is the maximum power the station can deliver.

• Charging Speed: In ideal conditions, it can deliver up to 100-120 km (approx. 60-75 miles) of range per hour of charging. This makes it significantly faster than a standard 7.4 kW home charger.

• Full Charge Time: The time to fully charge an EV depends on the battery size. For a typical 60-80 kWh battery, a full charge from empty would take 3 to 5 hours.

2. Electrical Requirements

This is the most critical aspect for installation. A 22 kW charger requires a three-phase power supply, which is common in commercial and industrial settings and in some residential areas (especially in Europe).

• Voltage: 400V AC (3-phase)

• Current: 32 Amps per phase

• Connection: Requires a dedicated circuit with a high-capacity cable, installed by a qualified electrician.

3. Connector Types

Most 22 kW AC chargers come with a Type 2 connector (Mennekes).

How It Works: The Crucial Role of the Onboard Charger

This is the most important concept to understand about AC charging. The charging station itself is essentially a sophisticated and safe "power outlet." The actual conversion from AC (from the grid) to DC (for the battery) happens inside the car by a component called the Onboard Charger (OBC).

The Limiting Factor: The car's onboard charger has a maximum power rating it can accept.

Example: If your EV has a single-phase 7.4 kW onboard charger, plugging it into a 22 kW three-phase station will result in a maximum charge rate of 7.4 kW. The car cannot use the extra power.

To fully utilize a 22 kW charger, your EV must have an 11 kW or 22 kW three-phase onboard charger. Many higher-end European models (e.g., some Audi, Mercedes, Porsche, Renault) have this capability, but many Asian and American models do not.

Typical Use Cases and Locations

22 kW chargers are ideal for locations where a car will be parked for a few hours, making them "destination chargers."

• Workplaces: Employees can fully recharge during an 8-hour workday.

• Shopping Malls & Retail Centers: Shoppers can get a significant charge while they shop and dine.

• Restaurants & Hotels: Patrons and guests can arrive with a low battery and leave with a full one.

• Fleet Depots: For company vehicles, taxis, or rental cars that return to a central location.

Public Car Parks: In city centers or transport hubs.

Advantages:

• Fast Destination Charging: Drastically reduces charging time compared to standard 7 kW chargers.

• Future-Proofing: As more EVs come with higher-capacity onboard chargers, having a 22 kW station installed makes the location more attractive.

• Efficient for Fleets: Allows multiple vehicles to be charged fully during a shift or overnight.

Disadvantages:

• Requires Three-Phase Power: Installation can be complex and expensive if this supply is not already available at the location.

• Limited by the Vehicle: Many EVs cannot accept the full 22 kW, making it an unnecessary expense in some cases.

• Higher Upfront Cost: The charger unit and installation are more costly than a single-phase 7 kW or 11 kW charger.

# A 22 kW AC charger is a powerful and efficient solution for destination charging where three-phase power is available. Its primary value is realized when used with EVs that have a compatible three-phase onboard charger, enabling a full charge in just a few hours. For locations looking to offer premium charging to customers, employees, or fleets, it represents an excellent balance between speed, cost, and practicality.