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10 Best Diesel Generators 2025 in the United States

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Our Top Picks

#1

Winner

DuroMax XP13000EH 13,000-Watt Dual Fuel Portable Generator - Gas & Propane, Electric Start, Whole Home Backup Power, Transfer Switch Ready, RV & Emergency Ready

The DuroMax XP13000EH is a powerful dual fuel portable generator that stands out for its impressive 13,000 watts of starting power, making it suitable for home backup during outages or powering tools on job sites. Its versatility in fuel options—running on either gasoline or propane—is a significant advantage, allowing users to choose based on availability and cost. The generator features a user-friendly electric start and a quick fuel switch, enhancing ease of use. With a robust all-metal construction, it's built for durability and can handle rough weather conditions, which is a plus for those needing reliable outdoor power.

On the portability front, the generator comes with no-flat tires and a foldable handle, making it relatively easy to transport. However, at 234 pounds, it may still be a bit heavy for some users to move around without assistance. The generator offers a solid run time and demonstrates a good balance of performance and satisfaction.

Despite its strengths, there are some drawbacks to consider. The noise level is typical for generators in this power range, which might be a concern for users in quiet neighborhoods. Additionally, while the DuroMax brand is known for its reliability, maintenance is essential for long-term performance, and users should be prepared for periodic upkeep. Lastly, while it comes with a variety of outlets, the absence of an automatic transfer switch (ATS) can be a drawback for those looking for seamless integration with home electrical systems.

The DuroMax XP13000EH is a strong contender for anyone needing portable power for residential use, RV trips, or job sites, especially if you value flexibility in fuel options and durability.

Customer Highlights

A summary of real customer reviews to highlight what shoppers are saying!
Power Output (kW/kVA)
Super powerful and easily ran our RV with 3 AC units during the brutal Phoenix summer months.
Fuel Consumption
The generator's versatility with both gasoline and propane is a significant advantage for different fuel availability and cost.
Noise Level
Despite some noise, the generator is dependable and powerful, handling multiple HVAC units, appliances, and electronics with ease.
#2

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

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.

Customer Highlights

A summary of real customer reviews to highlight what shoppers are saying!
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.
#3

WEN Quiet and Lightweight 3600-Watt Dual Fuel RV-Ready Portable Inverter Generator with Fuel Shut Off and CO Watchdog (DF360iX),120 Volts

The WEN Quiet and Lightweight 3600-Watt Dual Fuel RV-Ready Portable Inverter Generator (DF360iX) is a versatile option for those in need of a reliable power source for residential and camping purposes. One of its notable strengths is the dual-fuel capability, allowing it to run on both gasoline and propane, which adds flexibility depending on fuel availability. It delivers 3600 surge watts and 2900 rated watts on gasoline, and slightly less on propane with 3500 surge watts and 2600 rated watts. This makes it suitable for powering essential appliances and electronics, including sensitive ones like smartphones and laptops due to its clean power output feature.

The CO Watchdog sensor is a significant safety feature, automatically shutting off the generator if carbon monoxide levels become dangerous, enhancing user safety. Additionally, the generator operates quietly, comparable to a normal conversation, making it less disruptive in residential or camping settings. With a weight of 49 pounds and a compact design, it is relatively portable and easy to move around.

However, the fuel tank capacity of 1.5 gallons limits its continuous run time to about 5 hours, which may require frequent refueling for extended use. The generator does not come with an Automatic Transfer Switch (ATS), which means it cannot automatically switch to generator power during an outage. Maintenance is simplified with features like the fuel shut-off, but users may need to be vigilant about regular checks and servicing to ensure optimal performance. The WEN DF360iX is well-suited for those who prioritize portability, safety, and clean power in a generator, though it may require a bit more hands-on management in terms of fuel and maintenance.

Customer Highlights

A summary of real customer reviews to highlight what shoppers are saying!
Fuel Consumption
With dual-fuel capability, it starts right up and runs super quiet, especially with the eco switch that adjusts RPMs to save fuel.
Noise Level
The generator is incredibly quiet and works great, making it a worthwhile investment.
Portability
The lightweight design and sleek outer case make it easy to carry around without snagging on things.

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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