Why real charging can be slower
Charging speed is not constant. Battery temperature, charger limits, vehicle charge curve and high state of charge can slow real sessions. This calculator is a planning estimate.
Example
A 75 kWh battery charged from 20% to 80% needs 45 kWh added to the battery. At 90% efficiency, the grid supplies about 50 kWh. On an 11 kW charger, that is roughly 4.5 hours before real-world tapering or interruptions.
Common mistakes
Do not use battery capacity as if the car is charging from 0% to 100% unless that is actually the plan. Also check whether the charger, cable or vehicle onboard charger is the limiting power level.
Limitations
The estimate does not model fast-charging curves, cold battery preconditioning, charger sharing, queue time or charging above 80%, where many vehicles slow down.
Last reviewed: 2026-05-17