Onboard charger (OBC)
The onboard charger is the AC-to-DC converter built into every EV. It — not the wall unit — sets the maximum AC charging speed: a car with a 7.2 kW onboard charger charges at 7.2 kW even on a 19.2 kW home station.
Typical onboard charger ratings run from 6.6 kW (Nissan Leaf, Toyota bZ4X) through 10.5–11.5 kW (most current EVs) up to 19.2 kW (Ford F-150 Lightning ER, Lucid Air).
This is the single most useful number to know before buying a home charger: match the wall unit to the car’s onboard limit and spend the savings on installation quality.