I think that we should pay charging per minute, not Wh. This will make charging sessions faster, people will stop using charging stations for parking. Public charging stations are essential for long trips and emergencies, they shouldn’t be used by cars that stay there all day long.
Paying per minute will also encourage people to buy electric cars with faster internal chargers like Renault Zoe, and use charging stations that can supply electricity to the internal charger at its full supported rate.
In Europe all charging posts should at least supply 22 kW AC and electric car’s manufacturers should make internal chargers that are able to use those at full rate. Renault Zoe, Tesla Model S and X with dual-chargers and Smart ED with optional NLG664 Brusa charger are able to charge at 22 kW in AC posts.
An AC charging post is very cheap when compared to DC ones. In Europe we have to take advantage of our 3 phase electrical grid.
For internal chargers I think that 22 kW is enough, charging more than that should use DC externals chargers. Because chargers aren’t 100 % efficient, and they generate heat. So it’s better for more powerful chargers stay outside the car and away from the battery.
What do you think?