Real-world charge speeds
7 kW single-phase: about 40 km of range per hour. Full overnight charge on almost any EV.
11 kW three-phase: about 60 km per hour. Meaningful for daytime top-ups.
22 kW three-phase: about 120 km per hour. Overkill for most home use, but useful for high-km drivers or shared households.
What your EV can actually accept
Many EVs cap their onboard AC charging at 11 kW — a 22 kW charger won't go faster than the car allows.
Some entry-level EVs cap at 7 kW single-phase — an 11 kW charger gives no benefit at all.
Check your EV's onboard charger spec before paying for a higher-capacity unit.
Cost impact
7 kW: cheapest install, no supply upgrade needed for most homes.
11 kW / 22 kW: needs three-phase supply — retrofitting three-phase can add $2,000–$5,000 if you don't already have it.