The answer depends on two numbers: how much energy you need to add, and how fast your charger and car can deliver it.
The simple formula
Charging time (hours) ≈ energy needed (kWh) ÷ charging power (kW) × 1.1
The extra 10% accounts for typical charging losses.
Example: 60 kWh battery, from 20% to 80%
You need to add about 36 kWh.
| Charger | Power | Approx. time |
|---|---|---|
| Household socket | 2.3 kW | ~17 hours |
| Portable charger / wall box | 3.7 kW | ~11 hours |
| Wall box, single-phase | 7.4 kW | ~5.5 hours |
| Wall box, three-phase | 11 kW | ~3.5 hours |
Think in kilometres, not percent
Most drivers don't charge from empty. If you drive 40 km a day and your car uses about 17 kWh per 100 km, you need around 7 kWh a night:
- 2.3 kW: about 3.5 hours
- 11 kW: under 1 hour
This is why many drivers find a modest charger is enough for daily life.
What slows charging down
- Your car's onboard charger limit (see 7 kW, 11 kW or 22 kW?)
- Cold weather: the battery may need warming first
- Charging above 80%: many cars charge more slowly near full
- Load management: some chargers reduce power when other appliances are running
Tips for efficient home charging
- Use scheduling to charge during cheaper night tariffs.
- Set the daily charge limit to 80% for everyday use, as many manufacturers recommend.
- Precondition the car while plugged in during winter.
FAQ
Is it bad to charge every night?
No. Plugging in regularly and keeping the battery in a mid-range is good practice.
Why is my car charging slower than the charger's rating?
The car's onboard charger, temperature or current limit settings are usually the reason.