Estimate how long a home EV charging session will take based on battery size, starting and target state of charge, charger power, and the vehicle’s AC charging limit. The calculator applies a continuous-circuit load factor and charging efficiency, then reports wall energy, effective charging power, and average range gained per hour.
Charging time is an idealized average for the selected SOC window. Real power can vary with temperature, battery conditioning, voltage, and vehicle control.
Electrical installation and continuous-load limits must follow the charger instructions and applicable local electrical code.
A 75 kWh battery charging from 20% to 80% needs 45 kWh. With an 11.5 kW charger at 80%, an 11 kW vehicle limit, and 90% efficiency, effective wall power is 9.2 kW and time is about 5.43 hours.
The vehicle AC limit or the entered continuous-load factor can cap effective wall power below the charger nameplate rating.
It can. Battery management may reduce power near a high state of charge, so actual sessions can take longer than this constant-power estimate.
No. The estimate excludes vehicle-specific taper and thermal-conditioning behavior. Add taxes, financing costs, incentives, and contract-specific charges separately when they apply.
Yes. Decimal inputs are supported, and the calculator keeps full precision until results are displayed.
Zero is accepted where it represents a valid operating condition. A value that would make the formula undefined triggers an input message instead of showing an invalid result.
| Variable | Meaning | Unit |
|---|---|---|
| C | Usable battery capacity | kWh |
| ΔSOC | Target minus starting charge | % |
| P | Effective wall charging power | kW |
| η | Charging efficiency | % |