Running Watts vs Starting Watts: What to Check

Two watt figures on every listing

Generator listings carry 2 power figures: running watts and starting watts. Running watts is the power the unit can supply continuously while it runs. Starting watts is the higher, brief surge it can deliver when a motor-driven appliance first starts. Knowing which figure a title names matters because the 2 figures are not the same. Electric power is measured in watts, a unit of power, as the U.S. Energy Information Administration explains in its measuring electricity pages.

The listing title often shows only one figure, and that figure is usually the starting watts because it is the larger number. The same model's bullet list or the maker's page shows the running watts. Some titles show 2 figures side by side, with the starting figure first.

• Running watts, continuous watts and rated watts name the steady figure.
• Starting watts, surge watts and peak watts name the brief extra figure.
• A 2-figure title usually lists the starting figure first, but confirm on the maker's page.

Why motor loads draw starting watts

Motors need a brief surge of power when they start. A motor has to overcome its own inertia and get moving before it settles into steady operation. The surge lasts only a moment, but the generator must be able to supply it when the motor starts. That surge is what the starting watts figure names. Pumps, compressors and fans are motor loads; anything with a motor draws more at startup than it does while running.

Because of that surge, a listing's first figure is often the starting figure. The running figure is the one that describes steady, continuous use. Read both figures from the same listing or from the maker's page, not from a general estimate.

If a listing shows only a single figure, the buyer cannot tell whether it names starting watts or running watts without reading the maker's page. This is why the maker's page matters more than the listing title.

How to read the figures on a listing

When you read a generator listing, look for both figures. If the title shows only one figure, check the bullet list for the second one. If the bullet list does not state it, the listing may say "not stated by the seller." In that case, the maker's page for the model is the place to read the full specifications. The maker's page is also where details such as electric start and fuel type are listed, but for this question, focus on the 2 watt figures.

Some listings are renamed for different sellers, so the same model may appear many times under different titles. Compare listings on how they state the figures, not on the title alone.

To compare backup power options, the guides on this site group generator listings by the first watt figure in the title, which is usually the starting watts. The watts group is a listing word, not a size recommendation for your home.

What this site cannot tell you

This site does not size a home. It does not list what watts run specific appliances, and it gives no runtime or fuel-use figures. The stated details on a listing are the only evidence behind the buying guides. Matching a generator to your home's loads is a question for the maker and a licensed electrician.

The electrician can also say whether a portable or standby unit fits your home and whether any connection work is part of the decision. A licensed electrician is the only person who can relate stated watt figures to a specific home's wiring and loads. This article only explains the listing terms.

Questions for the maker and an electrician

Before you compare listings, ask the maker about the exact model and the electrician about your home.

• What are the running watts and starting watts for this exact model?
• Which motor-driven appliances is this model intended to start?
• Do you recommend a portable or a standby unit for this home?
• If the home is on a well, what does the electrician need to know about the pump motor?
• Does the maker's page show both figures before you buy?

Texas shopping situations

Before winter storm season, read the maker's page for the running and starting figures of any unit you consider. Do not shop by the title alone. The winter electric start guide covers a feature that often appears alongside the watt figures.

For preparation guidance before the season, check the Texas Division of Emergency Management and Texas Ready pages. The CDC's winter weather pages also cover preparing the home before a storm arrives, including making a plan and gathering supplies.

For a rural home, ask the electrician about motor-driven loads before comparing generator sizes. In a close neighborhood, the choice between an inverter unit and an open-frame unit is a shopping question about the listing type, not about size.

For a first generator, decide whether you want to power the whole house or only essentials. That question comes before the watt figures, because the 2 choices point to different types of listings. The whole house question points to standby listings, and the essentials question points to portable listings.

What to pick for your situation

Questions

Is running watts the same as continuous watts?

Yes. Running watts, continuous watts and rated watts name the same steady figure. Starting watts, surge watts and peak watts name the brief extra figure. The words vary by seller, so check the maker's page when the listing uses different words.

Why is the first figure in a title often the starting watts?

The starting figure is the larger number, so it appears first in many listing titles. The running figure is in the bullet list or on the maker's page.

Does every generator listing show both figures?

No. Some listings show one figure, some show 2. If one figure is missing, read the maker's page for the model. The listing may say "not stated by the seller" when a detail is absent.

Can this site tell me how many watts my home needs?

No. The site does not size homes and gives no appliance wattage tables. The wattage calculator article explains what this site does not cover. Ask the maker for the model's intended loads and a licensed electrician for your home's wiring and connections.

What does a 2-figure title mean?

Usually the first figure is the starting watts and the second is the running watts, but the seller's wording can vary. Confirm both figures on the maker's page.

Where should I start comparing generators?

Start with the main backup power guide to compare the types, then match your situation to a specific guide in the choose table above. Each guide groups listings by stated details such as the watt figures in the title.