Electricity Consumption – How much electricity an EV charger uses
How to Calculate EV Electricity Consumption Calculating electricity consumption for an electric vehicle (EV) involves understanding the relationship between bat
How to Calculate EV Electricity Consumption
Calculating electricity consumption for an electric vehicle (EV) involves understanding the relationship between battery capacity, charging speed, and real-world efficiency losses.
1. The Core Formula for Energy Consumption
The theoretical energy drawn during charging can be calculated using:
However, electricity drawn from the grid is usually higher than the energy stored in the battery because of charging losses. A practical estimate can be calculated as:
A typical charging efficiency factor is around 0.85 to 0.90, meaning approximately 10%–15% of the energy can be lost during the charging process.
2. Standard Home & Public Charging Benchmarks in India
| Charging Setup | Charger Power | Typical 20% to 80% Time (40 kWh Battery) |
Average Cost in India |
|---|---|---|---|
| Standard 15A Socket | 3.3 kW AC | ~8 to 9 hours | ₹4–₹9 / kWh (Home Tariff) |
| AC Wallbox | 7.2 kW AC | ~3.5 to 4 hours | ₹4–₹9 / kWh (Home Tariff) |
| Public AC Charger | 11 kW – 22 kW AC | ~2.5 to 3 hours | ₹8–₹15 / kWh |
| Public DC Fast Charger | 30 kW – 60+ kW DC | ~30 to 45 minutes | ₹18–₹25 / kWh |
3. Interactive EV Charging & Cost Calculator
Use the calculator below to estimate electricity consumption, charging duration, and total charging cost based on your EV battery size, current state of charge, charger power, charging efficiency, and electricity tariff.
Enter your EV and charging details to see the estimate.