It depends on how much of the battery you refill. Most EV batteries hold about 50 to 100 kWh of usable energy. Refilling from empty takes roughly that amount plus charging losses of around 10% on AC charging. Day to day, drivers usually add much less: a 40-mile day at about 0.30 kWh per mile needs roughly 12 kWh from the wall.
Examples
| Scenario | Energy into battery | From the wall (≈10% losses) |
|---|---|---|
| 40-mile day | about 11 kWh | about 12 kWh |
| 20% to 80%, 75 kWh battery | 45 kWh | about 50 kWh |
| Empty to full, 75 kWh battery | 75 kWh | about 82.5 kWh |
| Empty to full, 100 kWh battery | 100 kWh | about 110 kWh |
kW vs kWh
- kW is power, the rate of charging (like litres per minute).
- kWh is energy, the amount added (like litres).
- Time ≈ kWh ÷ kW: 50 kWh at 9.6 kW takes about 5.2 hours.
What It Costs
Multiply kWh by your electricity price; see how much it costs to charge at home. Chargers that display energy delivered, such as the EVDANCE EV-ACS4005T 40A NACS portable charger, show the kWh per session.
Frequently Asked Questions
How many kWh does a full charge use?
Roughly the usable battery capacity plus about 10%.
How many kWh per mile does an EV use?
Often about 0.25–0.35 kWh per mile.
What is the difference between kW and kWh?
kW is charging rate; kWh is energy amount.
Related Reading
Key Takeaways
- Most EV batteries hold about 50–100 kWh usable.
- Add about 10% for AC charging losses.
- Time ≈ kWh ÷ kW.