How many watts does a phone charger use?

While not as power-hungry as appliances like air conditioners or washing machines, it's important to know how much electricity a phone charger uses when you're looking at your whole home's energy usage.

Generally, phone chargers use about 5 watts (W) of electricity. Some faster chargers can use up to 20 W, but the majority of standard chargers are more around the 5 W range. Phone chargers usually use one to two amps and connect to a 120-volt outlet.

How many times you charge your phone has a large impact on how much electricity your phone charger uses. Assuming one full charge takes one hour:

• Charging your phone once per day uses 0.035 kilowatt-hours (kWh) of electricity per week, 0.15 kWh per month, and about 1.83 kWh per year.

• Charging your phone twice per day uses 0.07 kWh of electricity per week, 0.3 kWh per month, and about 3.65 kWh per year.

While 5 W is a good estimate for the average phone charger wattage, there are also "fast” chargers available for many phone models that pull higher wattages. Here's how much electricity you'll use over the course of a year for different wattage phone chargers:

How many watts do different phone chargers use in a year?

We'll mostly be referring to the electricity used by phone chargers 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!

When you get your monthly electric bill, you only see the total amount you're charged, not how much each appliance contributes to your final bill. Based on a typical wattage of 5 W for phone chargers (amounting to about 1.83 kWh/year if you use your phone charger for one full charge per day) and using state average electricity rates, here's how the cost to run a phone charger pans out over the course of a month and a year:

Monthly and yearly costs to run a phone charger by state

Note: average electricity rates are based on October 2021 data from the U.S. Energy Information Administration (EIA).

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.

What's the best time to run a phone charger?

If you're on a time-of-use (TOU) rate plan, you are charged different amounts for electricity throughout the day. In general, it's cheaper to use appliances during "off-peak” hours, which are usually overnight.

What size battery do you need to back up a phone charger?

All popular home batteries can power a phone charger: most lithium-ion batteries like the Tesla Powerwall or Generac PWRcell have a power rating of 4 to 5 kW or higher and 10+ kWh of usable capacity. Phone chargers use about 5 W (0.005 kW) of power at any one time, meaning a battery will be plenty suitable for backing up and powering your phone charger.

How many solar panels does it take to run a phone charger?

On average, phone chargers use about 5 W of electricity to stay powered. With solar panels rated at around 350 W, you'll be able to power a phone charger easily with one standard solar panel.

What are ENERGY STAR appliances?

ENERGY STAR is a U.S. government-backed system that certifies how energy-efficient appliances are. If an appliance is better than the average appliance in its category by a certain amount, it is labeled as "ENERGY STAR certified." ENERGY STAR appliances cost less money to run, given that they are more efficient with the electricity they use.

Solar savings vary widely, and your unique savings depend on factors like electricity usage, location, and electric rates and plans. In general, most homeowners can expect to save somewhere between $10,000 and $30,000 over the lifetime of a solar panel system. On average, it takes between 7 and 8 years for most homeowners who shop for solar on EnergySage to get their solar panels to pay for themselves.

Going solar is one of the most effective ways to reduce or eliminate your electric bill, and you should make sure you are getting several quotes from reputable installers before you decide to move forward. Visit the EnergySage Marketplace to get solar quotes from installers in your area and begin comparing options.