Generator for Small Appliances: Sizing and Outlets

What sizing means on a generator listing

When a listing describes a generator that can power small appliances, it is giving you two pieces of information: how much power the generator can produce, and how that power is delivered through its outlets. Neither figure tells you directly whether a refrigerator or a sump pump will run. That decision comes from comparing the generator's stated figures with the appliance's own power requirements. This site compares generators on their stated details, not on measured performance.

A generator listing typically names a starting watts figure and a running watts figure. The starting figure covers the extra demand when a motor starts, such as a refrigerator compressor or a sump pump. The running figure is what the generator can deliver continuously. You will see both on the maker's page, and you can read about how they relate in the article on running watts versus starting watts.

Reading starting and running watts

The watts figures in a listing title are the seller's summary. The maker's page will give the full set, often with the figure for each fuel type. When you compare two generators, look for the same terms so you are comparing the same meaning. A 'peak' or 'surge' figure on a listing often refers to the same moment of extra demand as 'starting watts.' The maker's page will define which term a model uses.

To match a small appliance, you need to compare the generator's running watts with the appliance's running watts, and the generator's starting watts with the appliance's starting demand. That comparison is the basis of any decision between a portable generator and a standby unit; this site cannot tell you which figure your appliance needs.

Matching outlets to your appliances

Small household appliances plug into standard 120V outlets. A generator listing will show the outlet set: a typical portable generator has several 120V outlets, and some also have a 240V outlet for larger loads. A sump pump and a refrigerator both use 120V plugs. The outlet shape and rating matter as much as the watts figure, because the plug on the appliance must fit the generator's receptacle.

The generator outlet types guide explains the common naming on listings. RV-ready outlets are not what you need for a fridge or a sump pump; those outlets serve the RV fixtures described in the RV and travel trailer requirements article.

Finding an appliance's power requirements

The only reliable way to know how much power a refrigerator or a sump pump needs is to read the nameplate on the appliance or the instruction manual. The nameplate lists the running watts and may list a starting figure. That figure is the one to compare against the generator's stated figures. Wattage tables in general articles are not a substitute for the appliance's own information.

For a refrigerator, the starting demand may be several times the running figure, so allow for that when comparing. If the appliance does not state a figure, ask the appliance maker. For a permanent connection to your home, a licensed electrician and the generator maker decide what is appropriate. Read the home backup sizing article for the broader context.

• Read the appliance nameplate for the watts figure.
• Note the plug type so you know which outlet you need.
• Compare that figure with the generator's stated starting and running watts.
• If the numbers do not match, move to a different watts group on this site.

Choosing a watts group by the listing

The site groups portable generators by their stated wattage, as in the 3,000 to 5,000 watts guide and the 5,001 to 9,000 watts guide. These groups give you a way to compare listings without comparing measured output. A small inverter generator, like the ones in the camping generator guide, often carries a lower starting figure than an open-frame model.

The right group for you is the one that includes models whose stated figures meet or exceed the appliance's stated requirements. The site's guides group by stated wattage, so you can quickly sort by the watts that match your appliance. The maker's page is the place to confirm that before you buy.

Inverter and conventional options

Both inverter and conventional generators have outlets that accept standard 120V plugs. The choice between them is mainly about the type you prefer for your situation, not about one being able to handle a refrigerator or a sump pump. The inverter versus conventional article explains the differences in listing terms, and the best inverter generator guide lists choices for that set type.

For small appliances, you can consider either set. The decision will come down to fuel, weight, the starting watts figure, and the outlets, all of which you can read on the listing and the maker's page.

A safety note before you run a generator

Follow the maker's manual and the CPSC, CDC, and NFPA carbon monoxide pages before you run the generator. The sources listed at the end of this article include the relevant pages.

What to pick for your situation

Questions

Can a generator power a refrigerator and a sump pump at the same time?

That depends on the combined starting and running figures of both appliances, which you read from their nameplates and compare to the generator's stated figures. The listing does not guarantee a combination; you have to compare the figures yourself.

What do the watts on the listing mean for small appliances?

The starting watts figure addresses the moment a motor starts, and the running watts is the continuous load. Compare these to the appliance's own figures on its nameplate.

Do I need a 240V outlet for a small appliance?

No, small household appliances like refrigerators and sump pumps plug into 120V outlets. A 240V outlet is for equipment that uses that voltage, such as a welder or an electric range, which is not a small appliance.

How do I know if a generator is big enough?

Compare the generator's stated running and starting watts with the appliance's nameplate figures. The generator maker's page may also provide guidance. This site does not size appliances for you; the decision belongs to you, the appliance maker, and an electrician if you are unsure.