How Much Electricity Does an EV Charging Station Use?
The streets are quiet at midnight, but your EV glides home effortlessly after a long road trip, its battery warning flashing 20%. You plug it into your EV charging station, and the display lights up with a satisfying click, signaling that it’s starting to recharge.
However, as the EV station powers your car steadily, you might wonder how much electricity it is actually using per session to fully charge your car. Is it a heavy consumer draining your home’s grid, an efficient system drawing just enough, or somewhere in between? Let’s find out.
Electricity Consumption Charts by Charger Level and EV
How much electricity your EV draws while charging depends on your vehicle, charge level, and equipment. Charging an EV to 80% shows clear differences depending on battery size and charger type. Here’s a general formula. This estimate gets you close; real results vary with losses, temperature, and battery conditioning.
- How to Estimate Energy Use
You can calculate the total electricity with:
kWh = Battery Capacity × SoC Added × (1 + Loss Factor)
- Battery Capacity: Total kWh of the battery (e.g., 40 or 100)
- SoC Added: portion of the battery being charged (0.8 for 80%)
- Loss Factor: 0.1–0.15 for typical home AC Level 2 charging, but DC fast charging may reach 0.15–0.20. Some sessions can be higher or lower.
- Example: Charging a 40 kWh battery to 80% on Level 2:
40 × 0.8 × 1.15 ≈ 36.8 kWh, which matches real-world readings.
- Electricity Consumption Trend by Charger Level and EV
Charts usually show time, kWh, and cost for different charger levels across 40–100 kWh batteries, with tapering curves after 80% SoC. Infographics on sites like EnergySage include sliders for custom battery inputs, estimating runtime and costs instantly.
Factors Affecting Electricity Consumption
Electricity use during EV charging depends on the charger type, the car, and the charging session itself. The following factors together determine how many kWh are drawn, efficiency, and cost.
- Charger Level
The following are some charger levels and their capacities:
- Level 1: Typically draws 1.4–1.9 kW from a standard 120V outlet (12–15A). Some 20A circuits can reach 2.4 kW. EV charging is a continuous load; circuit and receptacle must be sized correctly and in good condition. Full charging may take over 24–40 hours, depending on battery size.
- Level 2: Usually 7.7–11.5 kW for typical home setups; some higher-capacity units go up to 11–19 kW, depending on home wiring and EV compatibility.
- Battery Size and Vehicle Model
A Tesla Model S with a 100 kWh battery may draw roughly 110–115 kWh, including typical charging losses. However, it depends on the charger type and conditions. A Chevy Bolt with a 60 kWh battery needs about 65–70 kWh. Efficient cars like the Hyundai Ioniq use about 0.25 kWh per mile.
Energy use varies by driving conditions; 0.35–0.45 kWh per mile is typical for larger SUVs like the Rivian R1S. Each car has a maximum charging rate. Although some high-power Level 2 chargers can deliver up to 19 kW, most home chargers and EVs like the Chevy Bolt limit charging to 7–11 kW.
- Session Factors
Charging is faster with higher power but slows after 80% state of charge (SoC) to protect the battery, which increases time and energy losses during top-offs. Time-of-use plans can significantly reduce cost—check your utility rates.
How much energy you need also depends on the starting SoC. Charging from 20–80% uses fewer total kWh than 0–100%, even if the time feels similar.
- Other Influences
Cold weather can reduce range by roughly 15–30% and slow charging, slightly increasing overall electricity consumption. Depending on the vehicle, standby losses (vampire drain) may range from under 1 kWh to around 2–3 kWh per day.
Smart charging apps can help by scheduling sessions during low-rate hours and preheating the battery for better efficiency.
Closing Note
EV charging electricity depends on the charger level, battery size, and vehicle efficiency, as mentioned earlier. Cut your EV charging costs by choosing efficient Level 2 chargers. Use smart scheduling with off-peak hours and app timers.
Contact our licensed technicians at Finch Electrical Heating & Air for installing an EV charging station. Call us at (651) 243-4711 to book your service.
