AC charging uses a standard wall outlet or dedicated home charger to add range to your electric car

AC charging is the slowest way to add miles to an electric vehicle, but it is also the most common and the one you will use most often at home. An AC charger converts alternating current from your home's electrical panel into the direct current your car's battery needs. The car itself does most of the work — it contains an onboard charger that handles the conversion, so the external equipment is simpler and cheaper than DC fast chargers.

Most electric cars come with a Level 1 charger (a standard 120-volt plug) in the trunk. Plugging into any household outlet will charge your car, but very slowly — typically adding 2 to 5 miles of range per hour. A Level 2 charger, which runs on 240 volts, is faster and more practical for daily use. It adds 10 to 30 miles of range per hour, depending on your car's onboard charger capacity and the charger's power output.

Key Takeaways

  • Level 1 charging uses a standard 120-volt household outlet and adds 2 to 5 miles of range per hour; Level 2 uses 240 volts and adds 10 to 30 miles per hour.
  • Most electric cars have an onboard charger built in, so you only need to buy the external equipment (the plug and cable assembly).
  • Installing a Level 2 charger at home typically costs between $500 and $2,500 including the charger unit and electrical work, though costs vary by region and your home's existing electrical setup.
  • A full charge from empty on Level 2 usually takes 4 to 10 hours, depending on your car's battery size and charger power rating.
  • Public Level 2 chargers are common at workplaces, shopping centers, and parking garages, and many are free or cost $1 to $3 per hour.

Level 1 charging: what comes in the box

Every new electric car includes a Level 1 charger in the trunk or frunk. This is a cable with a standard 120-volt household plug on one end and a connector that fits your car's inlet on the other. You can plug it into any outlet — your kitchen, garage, or bedroom — and start charging when ready.

The trade-off is speed. A Level 1 charger adds roughly 2 to 5 miles of range per hour. If your car has a 60-kilowatt-hour battery and you start at empty, a full charge takes 12 to 30 hours. This works fine if you drive short distances and charge overnight, but it is impractical for longer commutes or frequent driving. Level 1 is best used as a backup or for topping up when you are parked for many hours.

Level 1 chargers draw very little power — typically 12 amps at 120 volts — so they do not require any electrical upgrades. You can use them when ready without calling an electrician.

Level 2 charging: faster home and public charging

A Level 2 charger runs on 240 volts, the same voltage as an electric dryer or water heater. It adds 10 to 30 miles of range per hour, depending on two things: your car's onboard charger capacity (measured in kilowatts) and the external charger's power output. A Tesla Model 3 with an 11-kilowatt onboard charger paired with a 11-kilowatt home charger will charge faster than the same car paired with a 7-kilowatt charger.

Installing a Level 2 charger at home requires an electrician to run a 240-volt circuit from your electrical panel to your garage or driveway. The total cost — charger unit plus installation — typically ranges from $500 to $2,500. The wide range reflects differences in your home's existing electrical capacity, the distance the electrician must run wire, and local labor rates. A home that already has a 240-volt outlet (from an old electric dryer, for example) will cost less to upgrade than one that needs a new circuit built from scratch.

Public Level 2 chargers are common at workplaces, shopping centers, apartment buildings, and municipal parking garages. Many are free; others charge $1 to $3 per hour or a flat fee per session. Apps like PlugShare and ChargePoint let you find nearby chargers, see whether they are available, and check their cost.

How long a full charge takes

Charging time depends on three variables: your car's battery size, your car's onboard charger capacity, and the external charger's power output. The slowest of these three determines your actual charging speed.

A typical mid-size electric car with a 60-kilowatt-hour battery and an 11-kilowatt onboard charger will charge fully on Level 2 in roughly 5 to 6 hours. A larger battery — say, 100 kilowatt-hours — takes 9 to 10 hours. A smaller battery — 40 kilowatt-hours — takes 3 to 4 hours. These are estimates; your actual time will vary based on the charger's power output, the car's efficiency, and whether the charger throttles power during the final stages of charging (most do, to protect battery health).

In practice, you rarely charge from completely empty to completely full. Most owners charge overnight to top up for the next day's driving, adding 30 to 50 miles of range in 2 to 4 hours. This is why Level 2 at home is so practical — you plug in when you arrive home and unplug with a full or nearly full battery in the morning.

Charger connectors and compatibility

The connector type varies by car manufacturer and region. In North America, most electric cars use one of two standards: the SAE J1772 connector (used by Tesla, Chevrolet, Ford, Volkswagen, and others) or the Tesla connector (used only by Tesla, though Tesla has begun adding J1772 ports to newer models). When you buy a Level 2 charger, you must match the connector to your car's inlet.

Level 1 chargers use a standard household plug, so there is no compatibility issue — they work with any car. Level 2 chargers come in different connector types, so check your car's manual or the inlet on your car before purchasing. Many public chargers have multiple connector types on the same unit, so you can use them regardless of your car's standard.

Electrical upgrades and installation

Installing a Level 2 charger at home begins with an electrician assessing your electrical panel. They need to confirm you have enough available capacity (typically 40 to 60 amps) and determine whether they can run a new circuit to your garage or driveway. If your panel is already at capacity, you may need a panel upgrade, which adds significant cost.

The electrician will run wire (usually 6-gauge or 8-gauge copper) from the panel to the charger location, install a dedicated breaker, and mount the charger on the wall or pedestal. The entire job typically takes a few hours to a full day. Permits are usually required and vary by municipality; your electrician will typically handle the permit process.

If you rent or live in an apartment, installing a permanent charger is usually not an option. Many apartment buildings and workplaces have shared Level 2 chargers, or you can use a portable Level 2 charger that plugs into a standard 240-volt outlet (if one is available in your parking area). Some states and cities have laws requiring landlords to allow charger installation or to provide charging infrastructure, but these vary widely.

Charging costs and electricity rates

The cost to charge depends on your local electricity rate and your car's efficiency. Electricity rates vary by region and time of day; some utilities offer lower rates during off-peak hours (typically late evening and early morning). Charging during these hours can reduce your cost significantly.

A typical electric car uses about 0.25 kilowatt-hours per mile. If your electricity costs $0.14 per kilowatt-hour, charging one mile costs about 3.5 cents. A full charge on a 60-kilowatt-hour battery costs roughly $8.40. This is much cheaper than gasoline, but the exact figure depends on your local rates and your car's efficiency.

Some owners install a time-of-use charger or a smart charger that can delay charging until off-peak hours, reducing costs further. These chargers connect to your home's Wi-Fi and can be controlled via a smartphone app.

Frequently Asked Questions

Can I use a Level 1 charger if I do not have a 240-volt outlet?

Yes. Level 1 chargers work with any standard 120-volt household outlet. You do not need any electrical upgrades. The trade-off is that charging is slow — typically 2 to 5 miles of range per hour — so it works best for overnight charging or when you are parked for many hours.

What happens if I charge my car in the rain?

Modern electric car chargers are weatherproof and safe to use in rain. The connector and inlet are designed to prevent water from reaching live electrical contacts. You can charge safely during rain, snow, or any weather condition.

Does charging damage my car's battery?

Regular AC charging does not damage the battery. Most electric cars are designed to charge daily on Level 2 without degradation. Battery degradation is gradual and normal over many years; it is not caused by charging itself. Extreme heat and frequent DC fast charging can accelerate degradation, but AC charging is gentle on the battery.

Can I charge my electric car with a regular extension cord?

You can use an extension cord with a Level 1 charger if necessary, though it is not ideal. For Level 2 charging, do not use a standard extension cord — the power draw is too high and creates a fire risk. If the charger is far from an outlet, hire an electrician to run a proper circuit instead.

What is the difference between a charger and an outlet?

A charger is the equipment that delivers power to your car. A Level 1 charger is the cable that comes with your car; a Level 2 charger is a unit mounted on a wall or pedestal. An outlet is straightforward where you plug the charger in. The outlet itself does not charge your car — the charger does.