64 amp EV charger: power, breaker size and range per hour
64 A × 240 V = 15.36 kW · circuit ≥ 80 A (usually a 80 A breaker) · about 51 mi of range per hour at 30 kWh/100 mi
The breaker figure follows the NEC rule that EV charging is a continuous load, so the circuit is sized at 125% of the charger's current (see DOE AFDC: charging at home). This is an estimate, not electrical advice; at 208 V (some apartments) power is about 13% lower.
Range added per hour for popular EVs
| EV | EPA kWh/100 mi | Per hour | Per 8-hour night |
|---|---|---|---|
| Tesla Model Y | 26.5 | 58 mi | 464 mi |
| Tesla Model 3 | 29.6 | 52 mi | 415 mi |
| Chevrolet Equinox EV | 32.6 | 47 mi | 377 mi |
| Ford F-150 Lightning | 47.9 | 32 mi | 257 mi |
| Hyundai Ioniq 5 | 34.5 | 45 mi | 356 mi |
| Ford Mustang Mach-E | 33.6 | 46 mi | 366 mi |
| Kia EV9 | 41 | 37 mi | 300 mi |
| Rivian R1S | 43.2 | 36 mi | 284 mi |
Estimates; assumes the car accepts 15.4 kW on AC. All EVs.
ENERGY STAR chargers rated 64 A (2), lowest standby first
| Charger | Max output | Max current | Cord | Wi-Fi/network | Standby (no vehicle) | Max standby cost/yr* |
|---|---|---|---|---|---|---|
| Enphase IQ EVSE NA | 15.36 kW | 64 A | 25 ft | Yes | 2.7 W | $4.33 |
| Enphase IQ EVSE and HCS EVSE | 15.36 kW | 64 A | 25 ft | Yes | 2.89 W | $4.64 |
*Estimate: ENERGY STAR "no vehicle mode" input power × 8,760 h, i.e. the most it could use in a year if no car were ever plugged in, × U.S. average residential rate 18.31¢/kWh (EIA, July 2026 (preliminary)).