5000 vs 5500 Watt Generators: Power Comparison

Understanding wattage figures on listings

Generator listings typically show two wattage numbers: starting watts (also called surge or peak watts) and running watts (also called continuous watts). Starting watts is the brief burst of power needed to start motor-driven appliances like refrigerators, air conditioners, or power tools. Running watts is the steady power needed to keep them operating.

The first wattage figure in a title is often the starting watts, because it is the larger number. For example, a generator listed as "5,500 starting watts" might have a running wattage of 4,500 or 5,000. Always check the full specifications on the listing or the maker's page to see both figures.

When comparing a 5,000-watt and a 5,500-watt generator, the difference is 500 watts. That 500 watts can be significant if you need to start a large motor or run several appliances at once. However, the actual capacity depends on the running watts, not just the starting watts. For more on how to read these figures, see our guide to generator specs.

• Starting watts: the maximum power for a few seconds when a motor starts.
• Running watts: the continuous power the generator can supply.
• The title's first figure is usually the starting watts; confirm on the listing.

Surge capacity and motor starting

Surge capacity is the extra power a generator can deliver for a short time to start motors. Devices like refrigerators, well pumps, and air conditioners draw more power when they start than when they run. This surge can be two to three times the running wattage of the appliance.

A 5,500-watt generator with a higher starting wattage can handle larger surge demands than a 5,000-watt unit. For example, a 5,000-watt generator might have 6,250 starting watts, while a 5,500-watt model might have 6,875 starting watts. The extra 500 watts of running capacity also provides more headroom for starting motors.

When you read a listing, look for the starting watts figure. If the generator's starting watts are not stated, the running watts alone may not tell you whether it can start a particular motor. The maker's page usually lists both figures. Learn more about surge power and starting vs running watts.

Appliance compatibility in general terms

The appliances you can run depend on the total wattage of everything connected at once. A 5,000-watt generator can power a refrigerator, a few lights, a sump pump, and a television simultaneously, but adding a large air conditioner or a well pump may exceed capacity. A 5,500-watt generator offers a bit more room for such loads.

This site does not provide a wattage worksheet or appliance-specific recommendations. Sizing a generator for your home or RV is a question for the maker and, for home wiring, a licensed electrician. The generator's manual and the maker's website are the best sources for load calculations.

When comparing the two sizes, consider the devices you expect to run at the same time. If you only need to power a few essentials during an outage, a 5,000-watt unit may suffice. If you plan to run larger tools or multiple appliances, the extra 500 watts of a 5,500-watt model could be useful. For more on home backup sizing, see our guide to home backup sizing.

Types and fuel options in this size range

Generators in the 5,000 to 5,500 watt range come as conventional portable units or inverter models. Conventional units are typically larger and less expensive, while inverter models are more compact and produce cleaner power for sensitive electronics. The listing title will state the type. Compare inverter vs conventional and portable vs inverter.

Fuel options include gasoline, dual fuel (gasoline and propane), and tri fuel (gasoline, propane, and natural gas). Dual fuel and tri fuel models let you switch fuels, which can be convenient during shortages. The fuel type is always stated in the title. See our fuel types comparison and dual fuel vs tri fuel.

For home backup, a conventional portable generator in this size range is common. For camping or RV use, an inverter model may be lighter and quieter, but the wattage is often lower. Check the listing for the fuel type and the type of generator. Explore the best camping generators and best RV generators.

Choosing between 5,000 and 5,500 watts

The choice between a 5,000-watt and a 5,500-watt generator comes down to your specific power needs. If you only need to run a few small appliances, the 5,000-watt model is sufficient. If you plan to run larger tools, a well pump, or multiple appliances, the 5,500-watt unit provides extra capacity.

Consider the starting watts as well. A 5,500-watt generator with a higher surge rating can start larger motors. If you have a big air conditioner or a deep well pump, the extra surge capacity may be essential.

Both sizes fall into the mid-range category for portable generators. They are suitable for home backup, job sites, and RV use, depending on the specific model. Read the listing carefully to see the running watts, starting watts, and fuel type. For a broad selection, check the best portable generators and best 5001 to 9000 watt generators.

What to pick for your situation

Questions

What is the difference between 5,000 and 5,500 watt generators?

The difference is 500 watts of running capacity. A 5,500-watt generator can handle slightly more load, which can be important for starting motors or running multiple appliances.

Can a 5,000-watt generator run a refrigerator?

A refrigerator typically requires a few hundred watts to run, but it may need a surge of power to start. A 5,000-watt generator can usually handle it, but check the starting watts on the listing.

Is a 5,500-watt generator worth the extra cost?

It depends on your needs. If you need extra capacity for larger tools or appliances, the extra 500 watts can be worth it. If you only need to power a few essentials, a 5,000-watt model may suffice.

What does starting watts mean on a generator?

Starting watts, also called surge watts, is the brief burst of power needed to start motor-driven appliances. It is higher than running watts and is often the first figure in a listing title.

Can I run a 5,500-watt generator on propane?

Yes, if the generator is dual fuel or tri fuel. These models can run on gasoline and propane, or gasoline, propane, and natural gas. Check the listing for the fuel type.