How Many Watts Do You Need from a Power Station?

What a watt measures

Electricity is measured in units of power called watts, as the U.S. Energy Information Administration explains. A watt describes how much power a device uses at a given moment. One watt is a very small amount of power, and some devices need only a few watts to operate.

When a power station listing states a figure in watts, that figure is the station's output, not its stored energy. Output tells you what the station can supply at one time. The stored energy is a separate figure in watt-hours, and the two answer different questions.

Continuous output is the figure to compare

A power station title usually lists the continuous output, the watt figure the station can keep supplying while running. That figure is the one to compare with the devices you plan to run at the same time. If the total running watts of your devices stays below the continuous output, the station can support them together.

The same title may also show a second watt figure for surge. Surge covers the moment when some devices draw more power at startup. A listing that shows two watt figures is giving you both the continuous level and the momentary level.

This site cannot tell you how many watts any particular appliance draws; the watt figure belongs on the device's own label or in its manual. Read the listing's stated details and the maker's page for what a model supports. The site's main portable power station guide explains how the picks are compared on stated details.

Startup surges and how listings show them

Some devices, especially ones with a motor, draw a bit more power for an instant when they start than they do while running. A power station listing may call that momentary level surge or peak and print it next to the continuous figure.

Surge power and constant power are two different figures on a listing. When a device needs a startup surge, the station's surge figure has to cover it, while the continuous figure has to cover the running load.

If the listing does not state a surge figure, the maker's page is the place to look. The site compares only what the listing states.

Totaling the running watts of your devices

To decide whether a station can run your setup, add the running watts of the devices you will use at the same time. Read each device's label for its watt figure rather than guessing; labels and manuals state the number the maker prints.

Keep the total below the station's continuous output. For any device that draws more at startup, make sure the momentary total stays within the surge figure. That is the whole sizing step; the site gives no runtime figure and no appliance wattage table, because neither is stated on the listings.

Runtime depends on stored energy, not on output; learn more in the separate article on power station runtime. The site's buying guides group stations by output range, and the main guide shows how output and capacity are read together on a listing.

Output and capacity are different figures

Watts measure power at a moment; watt-hours measure energy over time. The U.S. Energy Information Administration reports that the average U.S. household uses about 10,500 kilowatt-hours of electricity a year, which shows how much energy adds up in a home setting.

A station's continuous output in watts tells you how many devices it can supply at once. Its capacity in watt-hours tells you how long it can supply them. A station can have a high output and a small capacity, or the reverse; the two figures are read separately. The difference between the two units is explained in watt-hours versus amp-hours.

When reading a listing title, look for both figures: the watt figure for output and the watt-hour figure for capacity. If only one appears, the other is likely in the bullet list or on the maker's page.

What the maker's page adds

A listing states what the seller prints: capacity, continuous output, surge, chemistry, and bundle contents. The maker's page adds the details a listing may leave out, such as the devices a model supports and the conditions for using them.

When a listing shows no surge figure or no continuous figure, the maker's page is the next step. Read both together before deciding, as the site's guides do when they compare stated details. Start with the 1000Wh guide and the 2000Wh guide to see how output bands are grouped.

What to pick for your situation

Questions

What is the difference between watts and watt-hours?

Watts measure how much power a device uses at a moment; watt-hours measure stored energy over time. A station lists output in watts and capacity in watt-hours, and the two figures answer different questions.

What does continuous output mean on a power station title?

It is the watt figure the station can keep supplying while running. Compare it with the total running watts of the devices you plan to use at the same time.

What does surge mean on a listing?

Surge, also called peak, is the momentary watt level some devices draw at startup. It is listed separately from continuous output.

Do I need to match my devices' wattage exactly?

No. Add the running watts of the devices you will run together and keep the total below the continuous output, with room for any startup surge. The watt figure for each device is on its own label or in its manual.

Where do I find the wattage of my devices?

On each device's label or in its manual. The site does not print appliance wattage figures because the listings do not state them.

Does a higher watt figure mean longer runtime?

No. Output in watts and capacity in watt-hours are separate figures. Runtime depends on capacity, not on the continuous output figure.