Per-minute charging prevents people with crappy cars (PHEV, older EV) from hogging HVDC charging locations. They'll do it once, see the bill and never do it again.
Basically if your PHEV can only take in like 15kW from a charger it's not cost-effective to charge from a HVDC charger that costs 80 cents a minute. But if your car can get 300kW from the same charger, it becomes useful again.
Basically if your PHEV can only take in like 15kW from a charger it's not cost-effective to charge from a HVDC charger that costs 80 cents a minute. But if your car can get 300kW from the same charger, it becomes useful again.