Watt Hours Needed for Common Home Appliances

What watt-hours mean on a power station listing

A portable power station's battery capacity is stated in watt-hours (Wh) or kilowatt-hours (kWh). One kilowatt-hour equals 1,000 watt-hours. The EIA's page on measuring electricity explains that electricity is measured in watts, and a watt-hour is the energy used by a 1-watt device running for 1 hour.

When you read a listing, the watt-hour figure tells you how much energy the battery can store, not how fast it can deliver it. The continuous output in watts tells you the maximum load the station can run at once. Both numbers matter when you match a station to your appliances.

• Watt-hours (Wh) = capacity, the total energy stored.
• Watts (W) = the rate of power delivery at any moment.
• Kilowatt-hours (kWh) = 1,000 watt-hours, often used for larger stations.

How to estimate what your appliances need

Start by reading the label on each appliance. The label lists the wattage or the voltage and amperage. If only amps are shown, multiply volts by amps to get watts. The EIA's measuring electricity page explains the relationship between watts, volts, and amps.

For each device, multiply its wattage by the hours you expect to run it per day. For example, a 100-watt light run for 5 hours uses 500 watt-hours. Add up the totals for all the devices you plan to power. That sum is your daily watt-hour requirement.

Some appliances, like refrigerators and freezers, cycle on and off. The label wattage is the running draw when the compressor is on, not the average over a day. The maker's manual or the appliance's energy guide may give an average annual consumption, which you can divide by 365 for a daily average. This site does not provide appliance-specific figures because they vary by model and use.

Remember that a power station's capacity is the total energy available. If you need 1,200 watt-hours per day for your essentials, a 1,000Wh station will not cover a full day, while a 2,000Wh station will with some margin. The guides below compare stations on their stated capacity and output.

• Read the appliance label for watts or amps.
• Multiply watts by hours of use per day to get watt-hours.
• Add up all devices to find your daily total.
• Compare the total to the station's watt-hour capacity.

Common appliance categories and what they draw

While this site cannot give exact wattage for every model, you can group appliances by typical ranges. A small LED light bulb might draw under 10 watts. A laptop charger might draw around 60 to 100 watts. A refrigerator's running draw is often several hundred watts, but it cycles, so the average is lower. A window air conditioner can draw over 1,000 watts when running.

For a Florida home, the priority list often includes a refrigerator, lights, a phone or laptop charger, and maybe a fan. A power station in the 500Wh to 1,200Wh range can handle small electronics and lights for several hours. A station in the 2,000Wh to 3,000Wh range can support a refrigerator for a longer stretch, depending on its cycle. The best power stations for hurricanes guide covers these sizes.

If you need to run a window air conditioner or a well pump, the starting surge can be several times the running watts. Power stations list a peak output for short surges, but the continuous output must cover the running load. The best 3000Wh power stations guide lists stations with higher continuous output for such loads.

Matching capacity to your list

Once you have your daily watt-hour total, look for a power station with at least that capacity. It is wise to leave some margin because devices can draw more than the label suggests, and you may want extra for unexpected needs. The station's continuous output must also be higher than the combined running watts of everything you plug in at once.

For a small apartment or condo, a station in the 500Wh to 1,200Wh range can power lights, a phone, and a laptop for an evening. The best power stations for apartments guide lists models in that range.

For a house with a refrigerator and a few essentials, a 2,000Wh to 3,000Wh station gives more flexibility. The best 3000Wh power stations guide compares models with that capacity. If you need to run high-draw appliances like a window AC, look for a station with a continuous output above 1,500 watts, such as those in the best power stations for hurricanes guide.

Remember that a power station's capacity is fixed, but you can recharge it from solar panels if you have them. The best solar generators for Florida guide covers stations with solar panels in the box. Recharging depends on sunlight and panel wattage, which the maker's manual describes.

Why this site does not size a home for you

This site compares power stations on their stated details, but it cannot know your exact appliances, their age, or how you use them. Appliance wattage varies by model, and some devices have a starting surge that the label may not show. The only reliable way to size a station is to read your appliance labels and the station's stated capacity and output.

The Florida Division of Emergency Management's Plan & Prepare page advises building a disaster supply kit with items to last at least 7 days. That includes planning for your power needs. The best backup power for Florida guide can help you choose between a generator and a power station based on your situation.

If you are unsure about your electrical load, a licensed electrician can help you calculate it. This site does not provide wiring or connection advice; that is for the maker's manual and a professional.

What to pick for your situation

Questions

What is the difference between watts and watt-hours?

Watts measure the rate of power use at a moment. Watt-hours measure the total energy used over time. A 100-watt bulb running for 1 hour uses 100 watt-hours. The EIA explains this on its measuring electricity page.

How do I find out how many watts my refrigerator uses?

Check the label inside the fridge or on the back. It lists watts or amps. If only amps are shown, multiply by 120 volts for a typical US outlet. The running draw is when the compressor is on; the average is lower because it cycles.

Can a power station run a window air conditioner?

It depends on the station's continuous output and the AC's running watts. Window ACs often draw over 1,000 watts running, with a higher starting surge. Look for a station with continuous output above that, and check the peak output for the surge.

How many watt-hours do I need for a day of essentials?

Add up the wattage of each device you plan to run, multiply by the hours you'll use it, and sum the totals. For example, a 100W light for 5 hours is 500Wh. A refrigerator might use 1,000 to 2,000Wh per day depending on its cycle. Use that total to choose a station.

Should I buy a power station or a generator for my Florida home?

Power stations are battery-based and have no fuel or exhaust, but their capacity is limited. Generators can run larger loads for longer, but they require fuel and must be operated outdoors. The Florida Division of Emergency Management notes that generators may not be needed in apartments or condos. See the backup power guide for a comparison.