Use this page to check EV charger (Level 2) electricity consumption for your own EV charger (Level 2): enter your wattage, hours of use per day and electricity rate, and press Calculate. You see your daily, monthly and yearly cost plus your yearly kWh consumption. Those same results also cover EV charger (Level 2) power consumption. Also see how much electricity does an espresso machine use.
Wondering why your bill jumped after you plugged in a new car? EV charger (level 2) electricity consumption comes down to two numbers: how fast the charger pulls power while it runs, and how many miles of driving you need to refill each day. In this guide you will see how a Level 2 EV charger turns watts into kilowatt-hours, what that does to your electric bill, and how to estimate your own charging cost in a few minutes.
Level 2 charging uses a 240-volt supply, and a Level 2 home charger is what most owners install for their garage or driveway. Like other large appliances, it does not draw the same power all day. It pulls its full power output only while the car is accepting a charge, then drops to a trickle. Most residential units are rated between 7 and 11.5 kilowatts, so one hour of active charging uses between 7 and 11.5 kWh of electricity.
What your electric car actually costs you each month depends far more on how much you drive than on the charger label. An electric vehicle owner with a 30-mile daily commute uses roughly twice the energy of one who drives 15, even with the identical wall unit, and Level 2 EV charging works the same way for every electric car on the road. The sections below break down every step so you can swap in your own driving numbers.
Four units show up on every spec sheet, every electric car charger listing, and every utility bill, whether you are comparing Level 2 chargers or any other EV chargers. Knowing how they connect makes the rest of the math simple, and it explains why two chargers with the same plug can behave very differently once they are wired into a house. Compare with exercise bike electricity consumption.
Watts measure how fast electricity flows at one moment, and kilowatts are simply 1,000 watts. Kilowatt-hours measure energy over time: a charger running at 11 kilowatts for two hours has used 22 kWh. Your utility bills in kilowatt-hours, so that is the number to track. You get watts by multiplying volts by amps, and that wattage is the figure printed on the charger. The same units describe all EV charging, from a charging station at a mall to your own driveway.
Electrical code treats a continuous electric load, such as an overnight charge, as safe at 80 percent of the breaker size. A 60-amp breaker therefore supports a 48-amp charger, and 48 amps across a 240-volt supply is 11,520 watts, or 11.52 kW. This is the charger used in every example on this page. Other sizes scale the same way.
To work out how much energy you pull from the wall, convert the car's efficiency into a per-mile figure, multiply by the distance you drive, then divide by the charging efficiency to account for losses:
$$\text{Wall kWh} = \frac{\text{miles} \times \text{kWh per mile}}{\text{charging efficiency}}$$
The cost is then \(\text{Cost} = \text{Wall kWh} \times \text{electricity rate}\). Here is a scenario of our own to show the steps. A driver covers 11,200 miles per year in a car rated at 0.28 kWh per mile, charges with the 11.52 kW unit above, and pays 17.3 cents for each kilowatt-hour.
| Step | Calculation | Result |
|---|---|---|
| Battery energy needed per year | 11,200 miles × 0.28 kWh per mile | 3,136 kWh |
| Wall energy at 90% efficiency | 3,136 ÷ 0.90 | 3,484 kWh |
| Monthly kWh | 3,484 ÷ 12 | 290 kWh |
| Cost per year | 3,484 kWh × $0.173 | $603 |
| Cost per month | $603 ÷ 12 | $50.23 |
Spread over 365 days, that driver covers about 30.7 miles per day, which needs 8.6 kWh in the battery and 9.55 kWh from the wall. At 11.52 kW, the charger only runs for roughly 0.83 hours, about 50 minutes, each night. For the other 23 hours it sits idle.
Not every kilowatt-hour you pay for reaches the battery. Heat in the cable, the onboard charger and the battery itself all take a share, so the car receives about 90 percent of what the meter records. In our example those losses come to 348 kWh per year. Level 2 equipment is generally more efficient than a plain Level 1 cord, which is one more reason to compare the two.
Charge time is the battery capacity divided by the charge rate, plus the same loss allowance. The table assumes a 75 kWh battery filled from empty to full at 90 percent efficiency.
| Charger power | Typical circuit | Hours, empty to full | kWh from the wall |
|---|---|---|---|
| 3.84 kW | 20 A at 240 V | 21.7 | 83.3 kWh |
| 7.68 kW | 40 A at 240 V | 10.9 | 83.3 kWh |
| 11.52 kW | 60 A at 240 V | 7.2 | 83.3 kWh |
| 15.36 kW | 80 A at 240 V | 5.4 | 83.3 kWh |
| 19.2 kW | 100 A at 240 V | 4.3 | 83.3 kWh |
Notice the last column never changes. A faster charger shortens the charging time but does not change how much electricity a full battery needs. Your consumption follows the miles, not the plug.
Your vehicle has its own ceiling. Its onboard charger converts alternating current from the wall into direct current for the pack, and it accepts only a fixed maximum, for example 10.9 kW. A 19.2 kW wall unit cannot push any faster than that. Check both the battery size and the car's acceptance rate before paying for extra charging speed you cannot use; any vehicle with a small onboard unit gains nothing from Level 2 chargers rated far above it.
An electric motor wastes far less than a petrol engine, but models still differ. Efficiency, expressed as kWh per mile, is the biggest single lever on electricity use after distance. Larger trucks and SUVs sit at the high end, compact sedans at the low end. This table keeps our 11,200 miles per year and 90 percent charging efficiency, and shows what changes when only the vehicle changes.
| Efficiency | Yearly kWh | Monthly kWh | Annual cost at $0.173 |
|---|---|---|---|
| 0.24 kWh per mile | 2,987 kWh | 249 kWh | $517 |
| 0.28 kWh per mile | 3,484 kWh | 290 kWh | $603 |
| 0.32 kWh per mile | 3,982 kWh | 332 kWh | $689 |
| 0.38 kWh per mile | 4,729 kWh | 394 kWh | $818 |
| 0.44 kWh per mile | 5,476 kWh | 456 kWh | $947 |
The window sticker lists efficiency per 100 miles, so divide that number by 100 to get the per-mile figure used above. Compared with a petrol car, even the thirstiest row here is a modest monthly electricity add-on, because you stop buying gas and other fuel altogether.
The same 3,484 kWh produces very different bills depending on where you live. The state average price per kilowatt-hour swings widely, and your own rate plan may differ again. The table keeps our driver's 290 kWh month and swaps only the electricity rate.
| Electricity rate | Cost per month | Cost per year |
|---|---|---|
| 11 cents per kWh | $31.94 | $383 |
| 14 cents per kWh | $40.65 | $488 |
| 17.3 cents per kWh | $50.23 | $603 |
| 24 cents per kWh | $69.69 | $836 |
| 31 cents per kWh | $90.01 | $1,080 |
Many utilities sell cheaper electricity late at night, which suits Level 2 chargers because they finish fast and an electric car can sit idle the rest of the evening. Under a time-of-use plan, charging the 3,484 kWh at a 9.5 cent off-peak price costs about $331 per year, while the same energy at a 28 cent evening peak costs about $976. Since the car only needs around 50 minutes of charging each night, a timer or a smart charger can shift the whole session into the cheap window without any inconvenience to you.
A Level 1 cord, the slowest option next to Level 1 and level 1 style charging cords, plugs into a standard 120-volt outlet and delivers about 1 kW, adding only 3 to 5 miles of range per hour. A Level 2 unit adds roughly 10 to 20 miles of range per hour, so range per hour is the clearest way to compare them. The energy a mile needs is the same, but the slower cord keeps the car and the cord connected far longer and wastes a bigger share as heat. Compare with how much electricity does a water cooler use.
A charger waiting for a car still draws a little current. If a unit pulls 6 watts around the clock, that is 52.6 kWh and about $9 per year at our rate, small but not zero. An Energy Star certified model cuts that idle draw and keeps standby from creeping into your electric bill.
DC fast charging, also called Level 3, skips the onboard charger and feeds direct current to the battery at 50 kW or more. It is built for road trips and public charging corridors. Because commercial prices run above residential ones, relying on it daily usually costs more than home charging on your own unit.
A home EV charger needs more than a wall mount, and electric vehicle owners often discover that the work matters as much as the hardware. The installation must match what your house, your car and the local grid connection can supply, and homeowners are best served by a licensed electrician who can size everything correctly.
A dedicated circuit runs from your breaker box to the charger and carries nothing else. Pick the amperage first: a 40-amp circuit supports a 32-amp charger, and a 60-amp circuit supports the 48-amp unit in our example. Check that your panel has spare capacity, since a full panel may need an upgrade.
A tethered charger has its cable permanently attached, which is convenient and common in North America. An untethered one has a socket and takes your own cable, which keeps the unit cheaper and lets you swap in a longer lead later. Either type delivers the same kilowatts, and both count as Level 2 chargers.
Most non-Tesla cars use the J1772 connector, while Tesla supplies its own wall connector, and adapters bridge the gap. For outdoor spots, choose a weatherproof enclosure rated for rain and snow, and ask the installer to hardwire the unit rather than use a plug, which keeps the seal watertight. Compare the warranty too, since terms range from one year to five.
You cannot make the electric car need fewer miles, but you can shave the price of each one. These are the options with the biggest payoff, roughly in order:
Cutting waste at home also supports sustainability goals, and the same savings logic applies to a workplace or public charging site. Whatever your setup, the simple loop holds: estimate your miles, convert them to kWh, multiply by your rate, and adjust the plan until the number suits you. A plug-in hybrid follows the same math with a smaller battery.