The practical answer
Slow home charging usually comes from one of four places: the circuit amperage, the EVSE setting, the vehicle onboard charger limit, or vehicle scheduling and battery temperature behavior. The wall unit advertises a maximum; the actual session follows the lowest safe limit in the chain.
Decision path
- Check whether the car is charging on Level 1 or Level 2.
- Compare the charger amperage setting against the circuit size.
- Look up your vehicle's onboard AC charging limit.
- Check vehicle scheduling, departure time, battery preconditioning, and cold-weather behavior.
