On a quiet evening at home, the steady flow of technology works silently to recharge your electric car. This nightly routine is a well-coordinated process between your car’s battery, your home’s electrical system, and a special charger built to make the most of every bit of power. Charging an electric car at home with a standard 7 kW charger usually takes six to eight hours to fully charge a 60 kWh battery from empty. Slower 3.7 kW chargers can take up to 16 hours, so most people charge their cars overnight for convenience.
Calculation of Charging Time
The time it takes to charge an electric vehicle (EV) can be estimated with a simple formula:
Charging time (hours) = Battery capacity (kWh) ÷ Charger power (kW)
This tells you roughly how many hours it would take to go from an empty battery (0%) to a full charge (100%) at a certain charging speed. For example, if you have a 60 kWh battery and a 7 kW home charger:
Charging time = 60 ÷ 7 ≈ 8.6 hours
So, in perfect conditions, it would take about 8.6 hours to fully charge.
Average Charging Times for EV Residential Chargers
Here’s the average time required to charge an electric car at home, depending on the charger:
- 7 kW Home Charger: Can fully charge a typical 60 kWh battery in about 6–8 hours. This is a common Level 2 charger and works well for overnight charging.
- 3.7 kW Home Charger: Charges the same 60 kWh battery more slowly, taking up to 16 hours. It’s still fine for overnight charging, but about twice as slow as a 7 kW charger.
- Level 1 Charging (Standard 120V Outlet): Gives only about 1.4–1.9 kW of power, so charging a 60 kWh battery can take over 20 hours. This is usually too slow for everyday use unless you don’t drive much.
Factors That Affect the Charging Duration of an Electric Car
Charging time for electric cars depends on several main factors:
- Battery Charge Level (State of Charge): Charging is faster when the battery is low and slows down as it gets close to full to protect the battery. For example, fast chargers work best between 20% and 60% charge, but slow down after about 80%.
- Battery Size: Bigger batteries (measured in kilowatt-hours or kWh) take longer to charge because they store more energy. For example, a 100 kWh battery will take longer than a 30 kWh battery if both use the same charger.
- Car’s Charging Limits: Each car has built-in hardware that controls the maximum charging speed it can accept. Even if you plug into a powerful charger, your car might not use all of that power if it has a lower limit. These limits are different for regular AC charging and fast DC charging.
- Weather and Temperature: Extreme cold or heat can slow charging. Cold batteries may need warming up first, and hot batteries may need cooling. While most modern EVs have systems to manage this, charging still tends to be slower in extreme temperatures.
Wrapping Up
The time duration of charging an electric car with an EV residential charger varies with battery size and level of charging, as mentioned earlier. Therefore, knowing your vehicle’s battery capacity and charger details helps you charge more efficiently.
For a safe and effective setup, it’s best to contact our skilled team at Doctor Home Experts Electrical Heating And Air, who can install the right system for you. Call us at (713) 944-3362 today!