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If you have an electric car and charge it at home, chances are you''ve seen a spike in your monthly electricity consumption. But just how much electricity do those home chargers use? In this article, we''ll break down how many watts different electric car chargers for your home pull.
Generally, electric cars charged at home use about 7,200 watts (W) of electricity, which can vary depending on the mode and home charger. Most electric car chargers use between 32 and 40 amps and connect to a 240-volt outlet in your home''s breaker box.
How much you drive your electric vehicle (EV) has the biggest impact on how much electricity it uses to charge over time. On average, Americans drive about 14,000 miles per year, and based on data from fueleconomy.gov, EVs consume an average of 0.35 kilowatt-hours (kWh) per mile driven. Given these numbers:
Different model cars use different amounts of electricity and have different kWh per mile ratings. Assuming you drive your car like an average American (14,000 miles per year), here''s how much electricity you''ll use over the course of a year in cars with different kWh/mile ratings:
We''ll mostly be referring to the electricity used by electric cars in terms of kWh in this article. The reason is simple: your electric bill is measured in kWh, and you get charged based on the kWh of electricity you use per month!
Electric vehicle chargers come in a variety of wattages, and they can be broken into three categories: Level 1, Level 2, and Level 3 charging. In our examples above and below, we''ve assumed you use a typical Level 2 charger to power your electric car at home, which is how most EV owners operate.
There are a lot of terms you can use to describe how electricity flows and is used by appliances. We''ve already mentioned most of them – here are a few definitions to keep things straight:
Volts (V): volts (short for voltage) are measures of electrical pressure differences. Put simply, voltage is the speed of electricity passing through a circuit.
Amps (A): amps (short for amperes) are a measure of electrical current. Put simply, amps are the amount of electrons (which make up electricity) flowing through a circuit.
Watts (W) and kilowatts (kW): multiplying volts x amps gets you watts (or wattage). Put simply, watts are the rate of electricity consumption. A kilowatt is just 1,000 watts.
Kilowatt-hours (kWh): lastly, kilowatt-hours are how your electric bill measures your energy usage. Simply put, kilowatt-hours are electricity consumption over time.
When you get your monthly electric bill, you only get to see the total amount you''re charged, not how much each appliance contributes to your final bill. Based on a wattage of 7,200 W for electric car chargers (amounting to 408 kWh/month if you drive your car like an average person does) and using state average electricity rates, here''s how the cost to run an electric car pans out over the course of a month and a year:
At face value, that can look like a seriously expensive investment. However, it''s vital to remember that when you own and charge an EV, you won''t have to pay for gas anymore. Considering the average American pays well over $1,500 for gas per year, electric vehicles will almost always save you money on fuel.
Looking to offset your electric bills (and the energy these appliances use) with solar? When you sign up (for free!) on the EnergySage Marketplace, you can compare solar quotes from high-quality, local solar installers. Make sure to keep in mind your current and future electricity usage, and talk about how that could change with your installer for the most accurate quotes.
All electric vehicles have kWh/100-mile ratings - this is the amount of electricity they use per 100 miles driven. To calculate how much electricity your individual car model might use, first, convert that rating into a per-mile number by dividing by 100. That''s how we got our 0.35 kWh per mile number above.
Once you have a per-mile electricity usage figure, all you need to do is multiply that number by your estimated monthly or yearly mileage and then multiply the result by your local electricity rate.
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