Jeremy Harris· Registered
Isn't it possible to buy a charger that combines 3 phases into 1 and achieve the 7,4kW speed?
To replace the one in the car, you mean?
There are cars that do this, the Tesla Model 3 for example has three 16 A chargers, and can use two of them in parallel on a single phase supply, or all three separately on a three phase supply. Other cars have chargers that do something similar, varies from model to model.
Bear in mind that the box you have in your home for connecting to the car is not a charger, it's just a power outlet that can either supply single phase or three phase mains power to the charger(s) that are in the car.