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10 Best Diesel Generators 2025 in the United States

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Our technology thoroughly searches through the online shopping world, reviewing hundreds of sites. We then process and analyze this information, updating in real-time to bring you the latest top-rated products. This way, you always get the best and most current options available.

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Our Top Picks

#1

Winner

Westinghouse 14500 Peak Watt Tri-Fuel Home Backup Portable Generator, Remote Electric Start, Transfer Switch Ready, Gas, Propane, and Natural Gas Powered

Rating
10.0
Chosen by1,476
Power Output (kW/kVA)
Run Time
Maintenance and Service

Most important from
1421 reviews

Power Output (kW/kVA)
The generator provides ample power for most appliances and even a small gas furnace, making it an excellent backup option during outages.
Run Time
Its long runtime and dependable performance make it suitable for a variety of scenarios, from home backup to construction site use.
Maintenance and Service
The generator runs smoothly and is well-built, providing peace of mind during severe weather conditions like hurricanes.

The Westinghouse Outdoor Power Equipment 14500 Peak Watt Tri-Fuel Home Backup Portable Generator is a versatile option for homeowners needing reliable backup power. With a peak output of 14,500 watts and a running output of 11,500 watts on gasoline, it provides ample power for larger homes or for outdoor activities. The flexibility to use gasoline, propane, or natural gas makes it a tri-fuel generator, allowing users to choose the most convenient or economical fuel option. Its impressive run time of up to 19 hours on a full tank makes it suitable for extended outages, which is a significant advantage for those in areas prone to power interruptions.

Portability is another strong point, though weighing in at 230 pounds, it might require some effort to transport. The built-in electric start feature is user-friendly, enhancing convenience, especially during emergencies. The generator also includes an automatic transfer switch (ATS) readiness, which allows for seamless power transfer, making it easier to use during outages.

On the downside, the noise level during operation might be a concern for some users, particularly in quiet neighborhoods. While it’s fairly quiet for a generator, it's still advisable to check local noise ordinances if you plan to use it frequently. Maintenance is manageable, given the durable 550cc engine; however, like all generators, it will require regular upkeep to ensure longevity.

Rating
10.0
Chosen by1,476
Power Output (kW/kVA)
Run Time
Maintenance and Service

Most important from
1421 reviews

Power Output (kW/kVA)
The generator provides ample power for most appliances and even a small gas furnace, making it an excellent backup option during outages.
Run Time
Its long runtime and dependable performance make it suitable for a variety of scenarios, from home backup to construction site use.
Maintenance and Service
The generator runs smoothly and is well-built, providing peace of mind during severe weather conditions like hurricanes.
#2

maXpeedingrods 4000 Watt Dual Fuel Inverter Generator with Bluetooth® Control Start and Display, RV Ready, Electric Start, Quiet for Outdoor Camping, Home Backup, Garden,PGMA Compliant

Rating
10.0
Noise Level
Portability
Maintenance and Service

Most important from
1162 reviews

Noise Level
Runs quietly, making it ideal for campsites or power outages at home.
Portability
Lightweight and compact design enhances portability for outdoor adventures or emergency backup.
Maintenance and Service
Maintenance access could be improved, but the generator's performance outweighs this annoyance.

The maXpeedingrods 4000 Watt Dual Fuel Inverter Generator is designed for users who need a reliable power source for camping, RVs, or home backup during emergencies. Its dual fuel capability allows it to run on both gasoline and propane, providing flexibility in fuel choice. The generator is lightweight at 52.9 pounds, making portability easier for outdoor adventures or moving it around the home. With a noise level of just 58-60 decibels, it operates quietly—similar to a normal conversation—making it suitable for use in residential areas without disturbing neighbors.

One of its standout features is the Bluetooth app remote control, which allows users to monitor vital information like power output and fuel level, adding convenience for those who prefer modern technology. It also comes with an electric start feature, which can be a significant advantage for users who want a hassle-free startup.

The generator's power output of 4000 watts is adequate for many uses, though it may not be sufficient for larger appliances or extended use. The 13-hour runtime is decent at 25% load but may require refueling during longer outings. Additionally, while the dual-fuel feature is advantageous, users should consider the availability of both fuel types depending on their location, especially during emergencies.

Rating
10.0
Noise Level
Portability
Maintenance and Service

Most important from
1162 reviews

Noise Level
Runs quietly, making it ideal for campsites or power outages at home.
Portability
Lightweight and compact design enhances portability for outdoor adventures or emergency backup.
Maintenance and Service
Maintenance access could be improved, but the generator's performance outweighs this annoyance.
#3

Westinghouse 28000 Peak Watt Home Backup Portable Generator, Remote Electric Start with Auto Choke, Transfer Switch Ready 30A & 50A Outlets, Gas Powered, CO Sensor,Blue

Rating
9.9
Power Output (kW/kVA)
Fuel Consumption
Noise Level

Most important from
153 reviews

Power Output (kW/kVA)
The generator worked right away, quickly cranking out 18,000 watts for our house.
Fuel Consumption
It starts and stops easily from inside with a remote, and the 17-gallon tank reduces the need for frequent refueling.
Noise Level
Despite being loud, finding a good spot to block most of the noise made it manageable.
Portability
This unit is heavy but can be moved on level ground; using a small winch helped with hills.
Maintenance and Service
Customer service has been amazing, quickly replacing a damaged battery at no cost.

The Westinghouse 28000 Peak Watt Home Backup Portable Generator is a robust option for anyone needing a reliable backup power source, particularly for residential use. With a peak output of 28,000 watts and running at 20,000 watts, it delivers significant power, making it suitable for larger appliances during an outage. The generator features an easy-start mechanism with a remote key fob and push-button electric start, which simplifies operation and adds convenience.

One of its standout strengths is the impressive run time of up to 11 hours at half load, thanks to the sizable 17-gallon fuel tank. This extended run time combined with its automatic low oil and carbon monoxide shutdown enhances safety and usability. Portability is manageable despite its 599-pound weight, as it includes reinforced steel handles, making it easier to move when necessary.

There are a few drawbacks to consider. While it offers multiple outlets for various connections, the generator can produce noise levels that may be disruptive, especially in quieter neighborhoods. Additionally, maintenance may be more involved due to its 999cc engine, which could be a concern for those unfamiliar with engine upkeep. Westinghouse backs this generator with a 3-year limited warranty and nationwide service, providing reassurance. Users looking for a powerful, versatile, and relatively easy-to-use generator for home backup will likely find the Westinghouse model meets their needs well. However, those sensitive to noise or with limited experience in maintaining large engines might want to explore simpler alternatives.

Rating
9.9
Power Output (kW/kVA)
Fuel Consumption
Noise Level

Most important from
153 reviews

Power Output (kW/kVA)
The generator worked right away, quickly cranking out 18,000 watts for our house.
Fuel Consumption
It starts and stops easily from inside with a remote, and the 17-gallon tank reduces the need for frequent refueling.
Noise Level
Despite being loud, finding a good spot to block most of the noise made it manageable.
Portability
This unit is heavy but can be moved on level ground; using a small winch helped with hills.
Maintenance and Service
Customer service has been amazing, quickly replacing a damaged battery at no cost.

Buying Guide for the Best Diesel Generators

Choosing the right diesel generator can be a crucial decision, whether you need it for home backup, business continuity, or industrial use. The right generator will ensure you have a reliable power source when you need it most. To make an informed decision, you need to understand the key specifications and how they align with your specific needs. Here are the main factors to consider when selecting a diesel generator.
Power Output (kW/kVA)Power output is the amount of electrical power the generator can produce, measured in kilowatts (kW) or kilovolt-amperes (kVA). This is important because it determines whether the generator can handle the electrical load of your appliances or equipment. For small home use, a generator with a lower power output (5-10 kW) might be sufficient. For larger homes or small businesses, you might need something in the range of 10-50 kW. Industrial applications often require generators with power outputs exceeding 50 kW. Assess your power needs by listing all the devices you plan to run simultaneously and their power requirements.
Fuel ConsumptionFuel consumption indicates how much diesel the generator uses over a specific period, usually measured in liters per hour. This is important for understanding the operational cost and efficiency of the generator. Generators with lower fuel consumption are more economical to run. For occasional use, fuel consumption might not be a major concern, but for continuous or heavy use, choosing a generator with efficient fuel consumption can save you a lot of money in the long run. Check the manufacturer's specifications for fuel consumption rates at different loads.
Run TimeRun time refers to how long the generator can operate on a full tank of fuel. This is crucial for planning how long you can rely on the generator before needing to refuel. For emergency home use, a generator with a run time of 8-12 hours might be sufficient. For businesses or industrial use, you might need a generator that can run for 24 hours or more. Consider your typical usage patterns and how often you can realistically refuel the generator.
Noise LevelNoise level is measured in decibels (dB) and indicates how loud the generator will be during operation. This is important for ensuring comfort and compliance with local noise regulations. For residential areas, a quieter generator (below 70 dB) is preferable to avoid disturbing neighbors. For industrial areas, noise might be less of a concern, but it's still important to consider the working environment. Check the noise level specifications and consider where the generator will be placed and how the noise might affect you and others.
PortabilityPortability refers to how easy it is to move the generator. This is important if you need to transport the generator to different locations. Portable generators are typically smaller and have wheels for easy movement, making them suitable for home use, camping, or small job sites. Stationary generators are larger and designed to be installed in a fixed location, making them ideal for businesses or industrial use where the generator will remain in one place. Consider how and where you will use the generator to determine the level of portability you need.
Automatic Transfer Switch (ATS)An Automatic Transfer Switch (ATS) allows the generator to automatically switch on and off in response to power outages. This is important for ensuring a seamless transition to backup power without manual intervention. For home use, an ATS can provide peace of mind by automatically restoring power during an outage. For businesses, it ensures continuity of operations without downtime. If you need a reliable and automatic power backup solution, look for generators that come with or are compatible with an ATS.
Maintenance and ServiceMaintenance and service requirements refer to how often the generator needs to be serviced and how easy it is to perform maintenance tasks. This is important for ensuring the longevity and reliability of the generator. Generators with lower maintenance requirements and easy access to service parts are more convenient and cost-effective to own. Consider the availability of service centers and the manufacturer's reputation for reliability and support. Choose a generator that fits your ability to perform or arrange for regular maintenance.

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