How Fast Will My EV Charge at Home?

Every home-charging speed question reduces to three numbers, and the rule that the lowest limit wins. One: what the charger can deliver (its amps × 240V). Two: what your car's onboard charger accepts — the ceiling no wall charger can exceed. Three: how big the battery is. Charger vs car sets the power; battery size turns power into hours.

The two-step math

Step one — find your real power. Take the smaller of charger output and car limit. A 48-amp charger (11.5 kW) feeding a car that accepts 11.5 kW: 11.5 kW. The same charger feeding a 7.2 kW car: 7.2 kW — the extra capability simply idles (why over-buying wastes money).

Step two — divide the energy you need. Charging from 20% to 80% on an 82 kWh battery means adding ~49 kWh. At 11.5 kW: about 4.5 hours. At 7.2 kW: about 7. Real-world losses add roughly 10%, and the last 10-15% of a full charge trickles slower by design — which is why overnight windows make almost every combination workable.

Rules of thumb that survive contact

• Miles per hour of charging: a 48A charger adds roughly 25-35 miles of range per hour on most EVs; 32A adds ~20-25; a wall outlet (Level 1) adds 3-5.
• The overnight test: 10-12 parked hours × your charging rate must comfortably exceed daily miles driven. For nearly everyone, even 32A passes with room to spare.
• Cold weather taxes it: expect slower effective charging in a freezing garage — budget margin, not precision.

Model-specific numbers — onboard limits, battery sizes, real charge times — live in our per-model series in Charging Costs, and the cost calculator turns the same math into dollars.