Choosing the right generator is more than a simple purchase; it's an investment in comfort and peace of mind. While portable generators offer a quick fix, they often require more setup and deliver less power. On the other hand, a standby generator is like having a personal power station, ready to light up your entire home instantly, without any necessary prompts.
When purchasing a house generator, consider your key appliances (refrigerator, lighting, air conditioner) and estimate their wattage needs. This will assist you in figuring out how many watts (power output) your generator will need to produce.
When evaluating the runtime needed, you'll also want to consider a generator's fuel consumption and the normal duration of outages in your area. Most portable generators are gasoline-powered and generally can keep lights on and fridges running for several hours, but little more. They can't be depended on for longer-term backups, such as when you expect power to be out for several days.
Natural gas generators are permanently connected to a home's natural gas supply; they can operate as long as the gas supply remains uninterrupted. Natural gas and propane are generally considered cleaner-burning fuel sources and are also on-demand power sources.
Our Top Picks
Best Dual-Fuel:
Best 10,000 Watt Generator:
Champion Power Equipment 10000-Watt Tri-Fuel Portable Generator at Amazon$1,566
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What We Like
One of the largest air-cooled generators available
Quiet weekly self-test mode
Wi-Fi capabilities
What We Don't Like
Significantly lower power output when using natural gas
Transfer switch is not included
Air-cooled generators are the typical choice for backup residential power. This type of generator offers simple maintenance and affordability. The Generac Guardian 24kW is one of the largest air-cooled generators available, providing up to 24,000 watts of power when connected to a propane fuel supply.
Homeowners looking for a generator to handle increased power demands will appreciate this capable unit. It also offers Wi-Fi capabilities to monitor the unit’s operation from anywhere with the Mobile Link app.
This popular generator model maximizes power output but minimizes space requirements. The unit is 4 feet long and 2 feet wide, larger than the most compact generators available but on par with typical whole-home generators.
Generac also equipped this unit with a Quiet-Test weekly self-test mode that operates at just 57 decibels. During regular operation, the generator is rated for 67 decibels, which is average operating noise but impressive for a generator of this power capacity. This model doesn’t include a transfer switch, so you’ll need to purchase that separately.
Dimensions: 48 x 25 x 29 inches | Weight: 514 pounds |Power Output: 24,000 watts (LP)/21,000 watts (NG) | Fuel Type: Propane or natural gas | Warranty: 5 years
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What We Like
Includes 50-amp transfer switch
Uses 1.42 gallons of fuel per hour
Durable aluminum casing
What We Don't Like
No engine hour meter
Lacks Wi-Fi monitoring
The Generac PowerPact is a basic but well-equipped home generator and an excellent budget buy. Designed to serve as a backup generator for the most essential appliances, this model includes an automatic transfer switch that can cover up to eight circuits. It supplies up to 7,500 watts of power when using propane but can also operate on natural gas—however, power output is limited to 6,000 watts.
As expected for a bare-bones generator, this model lacks Wi-Fi monitoring capabilities. It also lacks an engine hour meter, but an aftermarket meter can be installed to help with routine oil changes and maintenance. Three sides of the generator's aluminum enclosure are also removable to make maintenance and repairs easier.
Dimensions: 36 x 27 x 25 inches | Weight: 280 pounds | Power Output: 7,500 watts (LP)/6,000 watts (NG) | Fuel Type: Propane, natural gas | Warranty: 3 years
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What We Like
NEMA 3R outdoor-rated transfer switch
Gull wing enclosure for easy maintenance
Battery tender to prevent dead batteries
What We Don't Like
Must buy batteries separately
Fuses not easily accessible on the switch
A standby generator is ready at a moment’s notice to keep important systems running during a power outage. The Champion 12.5-kW Home Standby Generator has a NEMA 3R outdoor-rated 100-amp transfer switch that covers 12 circuits. Instead of setting up a portable generator and plugging in a network of cords after a power failure, this generator will automatically keep appliances and systems you deem most important running. It can handle up to a 4-ton AC system.
No matter where you reside or the current season, this reliable generator is outfitted with a 24-volt starting mechanism that can withstand temperatures anywhere between -22 to 104 degrees. A battery tender ensures onboard batteries are ready to provide starting power. Keep in mind that the batteries are not included and will need to be purchased separately.
Dimensions: 49 x 28 x 28 inches | Weight: 427 pounds | Power Output: 12,500 watts (LP)/11,000 watts (NG) | Fuel Type: Propane or natural gas | Warranty: 10 years
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What We Like
120V or 240V operation
Electric start
What We Don't Like
No carbon monoxide sensor
You can use a portable generator for your home for short-term and limited power needs. This dual-fuel whole house generator from WEN can be easily converted to operate on propane fuel with the twist of a dial and can produce up to 4,750 surge watts and 3,800 running watts when powered by gasoline. It can run for seven hours with its 20-pound propane tank or for 11 hours at half load on the internal 4-gallon gas tank. A 47-inch gas hose is also part of the set.
While most portable generators include a push-button start, this model's electric start is key-operated for your convenience. It might not be enough power to keep major appliances or a central cooling system operational, but it will make short power outages more bearable. Another thing to keep in mind is that it doesn't have a carbon monoxide detector.
Dimensions: 23.2 x 17.5 x 18.5 inches | Weight: 105.8 pounds | Power Output: 4,750 watts | Fuel Type: Gasoline/propane | Warranty: 2 years
Best Battery
Goal Zero Yeti 1500X Portable Power Station
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What We Like
Fuel-free option
Lightweight
Can be used indoors
What We Don't Like
Requires recharging every 3 to 6 months
Lithium-ion batteries have limited lifecycles
The Goal Zero Yeti 1500X has a lithium-ion battery that can store up to 1,500 watts of power. While you might think that a portable power station lacks the juice to keep your home up and running in the event of a power failure, this top-of-the-line version from Goal Zero has enough power to operate a refrigerator for up to 21 hours. You can charge it through a solar panel, wall charger, or 12V car charger.It's also lightweight under 50 pounds, so you can pack it for a camping trip or store it in your safe space during inclement weather.
The Goal Zero Yeti 1500X cannot replace a whole-home generator but can serve as a short-term power supply. There are no fuel gauges to monitor, maintenance to perform, or exhaust fumes to worry about. In the event of a power failure, plug your most important devices and appliances into the outlets of the Yeti 1500X, which includes a pair of 120V AC outlets or USB ports.
Dimensions: 15.3 x 10.2 x 10.4 inches | Weight: 45.6 pounds | Power Output: 1,500 watts | Fuel Type: Not applicable | Warranty: 24 months
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What We Like
Quiet weekly self-test mode
Equipped for Wi-Fi monitoring
Durable casing
What We Don't Like
Transfer switch is not included
Unit relies on Wi-Fi too much
If you want nearly instant power restoration for key systems in the event of a power failure, install a backup generator like the Generac Guardian. This 10kW model offers Wi-Fi monitoring and is equipped for natural gas or propane fuel sources. You pair it based on your needs with a 100-amp, 16-circuit transfer switch, or a 200-amp smart switch.This generator boasts a sturdy aluminum casing with a powder-coated finish, ensuring it's resistant to corrosion and suitable for use in any weather condition.
The Generac Guardian Backup Generator is always ready to supply power to the most important systems of your home by conducting a weekly self-test lasting about five or twelve minutes. This model is fuel-efficient and operates quietly, with the five-minute test cycle producing only 57 decibels of noise.
Dimensions: 48 x 25 x 29 inches | Weight: 338 pounds | Power Output: 10,000 watts (LP)/9,000 watts (NG) | Fuel Type: Propane, natural gas | Warranty: 5 years
Best 10,000 Watt Generator
Champion Power Equipment 10000-Watt Tri-Fuel Portable Generator
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What We Like
Operates on three fuel types
Push-button start
Detects unsafe elevated levels of CO gas
What We Don't Like
No 50A outlet
If you are searching for a reliable generator to power your refrigerator, window AC, computer, phone charger, and other appliances, look no further than the Champion Power Equipment Tri-Fuel Generator. Unlike other generators on this list, you can operate this one on three different fuel types. This Champion generator model delivers maximum power output when fueled with gasoline. It can produce up to 10,000 peak watts and 8,000 running watts using gasoline. When the fuel tank is full, the engine can operate at 50 percent load for 12.5 hours.
The Champion tri-fuel generator has advanced safety features, including a carbon monoxide sensor and low-oil shutoff. Its digital LCD screen is also highly informative, showing the voltage, frequency, session run time, and total run time, which are useful in monitoring output and maintenance schedules.
The generator does not include a 50A outlet. However, it boasts several other outlets, such as a 120V 30A locking outlet (L5-30R), a 120V/240V 30A locking outlet (L14-30R), and four 120V 20A GFCI-protected household outlets (5-20R). These outlets offer users flexibility, allowing them to power various appliances, tools, and devices. Overall, this is an excellent choice for anyone who needs a reliable, multi-use power source.
Dimensions:26 x 28.2 x 27.6 inches |Weight: 207 pounds |Power Output:10,000 watts (gas), 9,000 watts (propane), 8,750 watts (natural gas) |Fuel Type:Gas, propane, natural gas |Warranty:3 years
Final Verdict
If you're looking for a well-equipped generator for your most commonly used appliances and conveniences, the Generac Guardian 24kW Home Generator is a great option. It offers the most power of all residential air-cooled generators and can be remotely monitored using Generac's Mobile Link Monitoring System. For a budget-friendly option, consider the Generac PowerPact 7,500 Watt Generator. Power output is significantly reduced, but it can keep up with essential items in the event of a power failure.
When Shopping for a Home Generator
Select a Compatible Fuel Source
Generators generally are powered by one of three fuel sources—gasoline, natural gas, or propane.
- Gasoline: Portable generators, like the WEN DF475T Portable Generator, which runs on gasoline, are useful in times of power outage because they allow you to continue using necessities like lights and refrigerators for a limited time. Since these generators, as with most gasoline-powered machines, produce exhaust fumes and carbon monoxide, these should always be used outside your home, where there is adequate ventilation. You will also need to keepgasoline stored properly for long periods of generator inactivity. A fuel stabilizer is one method of ensuring that the fuel in your generator remains ready for use.
- Natural Gas or Propane: Standby generators used in larger homes often run on natural gas or propane. These power options are more environmentally friendly than others because of the way they generate electricity. However, it's vital to note that natural gas-powered generators must be plugged into the home's gas system and will only function while the gas supply is not disrupted. dduroma
- Less Common Fuel Sources: Solar or battery-powered generators may be a suitable alternative power source for people who like them, especially when camping or when power needs are modest. The Goal Zero Yeti 1500X Generator (our best battery pick) is a battery-powered generator that requires no installation and can operate a fridge for up to 28 hours.
Understand Your Household's Wattage Needs
The watts produced by a generator quantify the generator's ability to power whatever is plugged into it. This is one of the most important specifications on any generator you’re considering.
Start by understanding how much power each home component needs. While an appliance's actual wattage is shown on its power consumption label, count on needing around 2,000 watts to keep your refrigerator cold and most of the lights on; 3,500 watts to add a window air conditioner; up to 7,500 watts to add a sump pump and furnace; and 20,000 watts to power most everything. To know how many watts you need in a generator, add the wattage of the appliances or equipment you’re most likely to operate. You can use this worksheet to help in your calculations.
This number is only the beginning, however, because wattage consists of three components: the power to start an appliance, to keep it running, and to withstand a power surge—that moment when the regular juice starts flowing again and everything starts up. Many appliances require more power during startup compared with their running energy consumption. If you don’t factor in the starting watts, you may overload the generator as you start up appliances or other items.
Similarly, the generator may be overloaded from a power surge if the machine can't supply enough wattage. So, depending on whether you power just a few items or the entire house, understand how much total wattage your generator can produce.
Generally, increased wattage equates to an increased generator cost. But most people would agree it is better to have adequate power than to be left in the dark or to choose between running your refrigerator or keeping cool with a fan.
Consider Generator Types and Sizes
Decide which type of generator is best for your needs: a portable generator or a standby (or backup) generator. When doing this, determine whether you want to keep only the lights on, or whether you want to run other electrical components as well, such as computers, the refrigerator, and a window or central air conditioner.
Portable generators are best suited for temporarily powering an appliance or two and smaller tools, or electric-powered items, like fans or lights. A portable generator like the WEN DF475T Portable Generator with 4,750 running watts is perfect for limited power needs. In general, portable generators make life more bearable during short power outages but don’t support all the creature comforts such as a central air conditioning system, water heater, and other large appliances. Inverters are a portable, gasoline-powered generator that uses less fuel and offers quieter operation by constantly adjusting engine speed to power only what's using the energy load. Those machines have higher price tags.
A standby generator, like the Generac Guardian 24kW Home Generator, is the most common option for whole-home generators since it offers average power outputs ranging from 10,000 to 24,000 watts. This generator type is permanently installed outside the home and is connected to a propane fuel tank or natural gas line. With the addition of a transfer switch, standby generators are ready to supply power for a few hours or a few days or more, thanks to a readily available fuel supply and high wattages.
Standby generators come in air-cooled and liquid-cooled models. Air-cooled units, which use fans to keep engines from overheating, can serve residential homes with average power needs. Liquid-cooled generators tend to be found in higher-wattage units, which homes in warmer climates rely on to run central air conditioner systems. In addition, liquid-cooled generators generally offer a quieter operation.
Home generators also require space for installation, so factor in the size of any model you're considering. The size of a generator ranges from compact units, with footprints less than 3 feet long, to large, liquid-cooled units measuring 5 feet long or more. Generally, the more power capacity, the larger the generator.
Model specifications and local codes may dictate how much clearance is required between the generator and your home. Some small generators require as little as 18 inches of clearance.
Check for Warranties
Most residential portable and inverter generators are protected by a 2- or 3-year warranty that covers parts and labor. Standby generators, generally larger investments, usually offer 3- or 5-year warranty periods, like our best overall pick, the Generac Guardian 24kW Home Generator.
Some warranties also cover travel costs for a technician to come and service the generator, but this varies by manufacturer and model. Read the fine print closely to see what is covered.
Standout Features
Automatic Start
Some whole home generators automatically, like the Champion 12.5-kW Home Standby Generator, kick in when the power goes out. This enables the generator to start supplying power to your home when it detects an absence of juice from the electric utility. Usually, this feature is found only on standby generators and not portables. The peace of mind that comes with knowing your generator automatically steps into power without interrupting vital systems, like a sump pump and heating and cooling system, may be worth the higher price tag that often comes with these systems.
Note that this isn’t the same thing as an electric start, which powers your generator with the push of a button rather than the recoil start typical of most small motor machines. In the case of a generator equipped with an electronic start, you still need to start the generator to begin the flow of power manually.
Transfer Switch
A transfer switch, connected to your home's power box, automatically changes the power source from the electric utility to your backup. The system is designed to detect when the generator starts so your home can use its energy. The switch then disconnects your home from the power grid and supplies power from your generator to designated circuits in your home. This process happens seamlessly if your generator has an automatic start (see above), which engages the machine after it detects an absence of power from the electric company grid. We strongly recommend that a transfer switch be installed by a professional electrician.
Never plug your generator into a standard electrical outlet—doing so can create electrical hazards, including back feed that can endanger utility workers who may be repairing power lines.
FAQ
How do you safely run a home generator?
A whole-home generator, or standby generator, must be connected to a transfer switch—which disconnects your circuit panel from the electrical grid before allowing power to flow through the circuits.
Portable generators require you to initiate the power transfer manually. Those products require different safety precautions, including the often-repeated advice to never operate the unit inside the home or garage; and never plug a portable generator into hardwired appliances or standard electrical outlets.
Where is the best place to put your home generator?
Natural gas, propane, and gasoline-powered home generators produce exhaust fumes that contain carbon monoxide, so choosing the right installation spot is important for health and safety reasons. Because of this, local codes and utility companies typically dictate placement requirements.
Generally, a generator should be installed at least 5 feet from windows and doors. Some generators can be installed as close as 18 inches to the house, but you still need the 5 feet of clearance from air intake locations on the house.
Portable generators should never be used indoors, including in a garage. Instead, this type of generator should be positioned outside the home, with sufficient clearance from doors and windows—typically, 20 feet or more.
What regular maintenance should be performed on a home generator?
The manufacturer of any generator you purchase should provide basic maintenance information, but in general, it’s recommended that you do the following for most models of generators.
- Perform a weekly self-test or run the generator for at least 30 minutes once per month. Most whole-home generators feature automatic self-test cycles that run for 15 minutes or less each week. For portable generators, you need to run the system manually. Doing so keeps the motor and components from seizing up and becoming prone to breaking or failure. Ensure you only operate the generator in a well-ventilated, open area—even during these short maintenance runs.
- Add fuel stabilizer to the tank when storing a gasoline-powered generator for an extended period. This additive helps ward off corrosion, rust, and sediment. Gasoline that has gone bad is a leading cause of small engine failure, so don’t neglect proper fuel storage.
- Regularly repair or replace motor components that are subject to wear and tear. Items like spark plugs, air filters, fuel filters, and more can become worn over time.
- Never let the oil run low in your generator and perform regular oil changes. Doing so can cause major engine damage or even failure of the motor. Monitor oil levels and replenish as necessary. Many standby generators have a meter for engine hours to alert you to when it's time for an oil change.
Why Trust The Spruce?
Erica Puisis, a freelance writer, has experience investigating the best home generators and portable generators and developing buying guides to help consumers make informed choices. Puisis is familiar with the generator features that matter and the brands that offer reliable performance. She considered power output, size, fuel type, and cooling system to find the best home generators for this list. Most of the generators on this list are whole-home generators, but portable and battery generators are included for short-term supplementary power needs.
Our Experts:
- Emma Phelps, associate editor at The Spruce
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