Best 4000 Watt Generators – Buyer’s Guide & Reviews

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Whether you live in a hurricane-prone area or love to go camping every weekend, a generator is a lifesaver. A 4,000-watt generator is ideal for a medium-sized home, as it can power all your essential appliances and electronics such as refrigerators, air conditioners, microwaves, ovens, and water pumps.

It is large enough to meet all your needs, yet portable so that you can take it camping and on road trips with you. It can simultaneously run toasters and coffee makers, as well as big and delicate appliances.

We evaluated the top 4,000-watt generators in the market based on a number of factors. We looked at how much continuous wattage the generator can produce, as 4,000-watt generators vary in that regard. Fuel tank size and efficiency are also important factors to consider since they affect the models’ run time and fuel consumption.

If you want to run only a few small home appliances, you can go with 2000 watt generators, and if want to power a few more products 5000-watt generators are good to go.

The portability of the products was also an important factor since you might want to take them camping or put them in your RV for a summer road trip. A product’s warranty, return policy, and technical support are other considerations that contribute to determining its quality. For the best 4000 watt generator, our tech geeks tested every model listed below after hours of research.

We also analyzed technical specifications, customer reviews, and expert comments to compile a research-driven review. It contains a table of all the generators we reviewed, detailed reviews of each generator, and a buying guide that will assist you in making the right choice for your preferences.

The 10 Best 4000 Watt Generators on the Market Today

Since there are so many generators on the market, it can be difficult to choose the right one. After reviewing hundreds of generators, Having reviewed their specifications, we have found several that may be worth your time and money.

Products Image ProductsDetails Price
Westinghouse WGen 3600Westinghouse WGen 3600Wattage (Start / Running: 4650 / 3600
Noise: 68 dBA
Weight: 105 lbs
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Firman 3650 PO3601Firman 3650 PO3601Wattage (Start / Running: 4550 / 3650
Noise: 67 dBA
Weight: 101 lbs
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Champion DS4000SChampion DS4000SWattage (Start / Running: 4000 / 3500
Noise: 64 dBA
Weight: 81 lbs
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DuroMax XP4000SDuroMax XP4000SWattage (Start / Running: 4000 / 3300
Noise: 69 dBA
Weight: 90 lbs
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DuroStar DS 4000SDuroStar DS 4000SWattage (Start / Running: 4000 / 3300
Noise: 69 dBA
Weight: 94 lbs
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Westinghouse iGen4500Westinghouse iGen4500Wattage (Start / Running: 4500 / 3700
Noise: 52 dBA
Weight: 104 lbs
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Pulsar PG4000iSRPulsar PG4000iSRWattage (Start / Running: 4000 / 3500
Noise: 63 dBA
Weight: 92 lbs
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Westinghouse iPro4200Westinghouse iPro4200Wattage (Start / Running: 4200 / 3500
Noise: 62 dBA
Weight: 80 lbs
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WEN 56475WEN 56475Wattage (Start / Running: 4750 / 3750
Noise: 60-67 dBA
Weight: 112 lbs
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XtremepowerUS 4000-Watt Gasoline GeneratorXtremepowerUS 4000-Watt Gasoline GeneratorWattage (Start / Running: 4000 / 3500
Noise: 67 dBA
Weight: 105 lbs
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1. Westinghouse WGen 3600 – Best 4000 Watt Generator in 2022

Westinghouse WGen 3600 - Best 4000 Watt Generator
62 dB is relatively quiet
Large fuel tank for uninterrupted nighttime operation
Warranty of up to three years
An intuitive control panel makes it easy to use

The WGen 3600 is an excellent choice if you are looking for a fuel-efficient, quiet generator that can power your basic appliances.

Known for making reliable and affordable generators, Westinghouse is a well-known manufacturer.

If you have a 50% load, the WGen 3600 has a runtime of 12 hours on a four-gallon tank. In most cases, this is more than sufficient for most household appliances and camping use, since you won’t need to top off the generator in the middle of the night.

The control panel of the generator is intuitive and well-designed. Grouped by function, the controls are evenly distributed to prevent clutter and confusion. The WGen 3600 is versatile enough to be used almost anywhere because of its four outlets.


A TT-30R RV outlet is ideal for camping or home backup
Up to 13.5 hours of run time at 50% load
4650 peak watts, 3600 rated watts
3,600 running watts and 4,650 peak watts with recoil start


Heavy and difficult to move
The lack of an hour meter makes it difficult to track maintenance time

2. Firman 3650 PO3601 – Best 4000 Watt Generator Under $500

Firman 3650 PO3601 - Best 4000 Watt Generator
Longer runtime than many of its competitors
Remote start is convenient
Simple to use

The Firman 3650 Watts PO3601 should be high on your list of generators to buy if you want to get the longest runtime.

With a large, five-gallon tank and 14-hour runtime, you can leave this on all night and still use it in the morning.

The Firman PO3601 has a maximum output of 4550 W, significantly higher than many of the other generators we reviewed, with a running power of 3650 W. Having extra power makes it an excellent option for people wanting to independently power basic workshop tools like belt sanders and air compressors.

There are four AC outlets in the Firman 3650 PO3601, including the TT-30, 120 V, and a 30 amp twist-lock outlet needed for RV hook-ups. Control panel information includes total lifetime hours, voltage, frequency, as well as a fuel gauge, which helps evaluate the generator’s supply quickly.


Wattage sufficient to power most household appliances, including air conditioners
Noise level is minimal
A price you can afford
Shutdowns when oil levels are low or overloads are detected
Parallel connection of another generator


Over 100 pounds

3. Champion DS4000S – Best 4000 Watt RV Generator

Champion DS4000S - Best 4000 Watt Generator
59 dB of noise – Much Quiet
A good warranty ensures reliability
Efficient in consuming fuel
Much more reliable

Champion is a recent contender in the portable generator market. Despite operating on US soil, the company manufactures its products in China. Since Champion produces its generators in China, it can offer customers a cost-effective, reliable product that is competitive with more well-known brands such as Generac.

A Champion DS4000S uses an advanced inverter to reduce noise pollution and weight. Moreover, the generator has an ‘economy mode’ that conserves fuel when used for minimal performance, so you can still use most of your appliances while saving a lot.

To ensure that each generator performs well under normal conditions, Champion generators undergo a rigorous testing and verification process. In case of a problem with the generator, the company offers 24/7 customer support.


Parallel-ready components allow you to run multiple appliances at the same time
Inverters reduce noise and weight
Excellent customer service with chat, email, and phone options
This is an economical choice due to its high fuel efficiency and affordable spare parts
It has an intuitive control panel that makes it easy to use
The remote start feature is convenient


Heavily loaded and difficult to move

4. DuroMax XP4000S – Best 4000 Watt Generator in 2022

DuroMax XP4000S - Best 4000 Watt Generator
A good purchase for the economy
A system with a pull start
The dual-fuel machine
Running time is impressive

DuroMax XP4000 generators are lightweight generators that are ideal for camping, RV travel, and tailgating.

With its spark arrestor, the generator can be used safely in forested areas, which is an appealing feature for campers.

The DuroMax XP4000S generates an average wattage of 3300 W and can reach 4000 W in peaks. When the battery is at 50% load, the four-gallon tank provides enough fuel for a 12-hour runtime. The generator’s power fluctuates slightly, with a distortion of 12%, making it unsuitable for sensitive electronic devices like mobile phones and tablets.

There are three AC outlets on the generator, and it is RV-ready with an L5-30P to TT-30R adaptor. The control panel also featured a convenient voltmeter for activity monitoring and an integrated fuel and oil gauge.


CARB-compliant and approved by the EPA
The funnel and tool kit are included as well as several other accessories
Peace of mind with a limited warranty of three years
A relatively lightweight open-frame design that is convenient to use


There is no electric start

5. DuroStar DS 4000S – Best 4000 Watt Generator in 2022

DuroStar DS 4000S - Best 4000 Watt Generator
Featuring a twist-lock outlet for RVs
Lightweight and easy to carry
Digital inverter technology is safe for electronics
Noise reduction during operation

The DuroStar DS 4000S is a great place to start looking if you want great value for your money.

This portable generator can deliver 3300 W of continuous power with a peak of 4000 W. It features two power outlets, including a 120V 30A with twist-lock, which is ideal for RV travelers.

A DS 4000S has an automatic oil protector that will shut off the engine if it detects low oil levels, preventing engine damage. The generator also comes with a generous four-gallon fuel tank that can fuel it for up to eight hours at 50% load.

The DS 4000S is best suited to building sites or as a backup generator for a home due to its relatively loud engine, which can be problematic on camping trips. It’s reliable and robust enough to handle construction sites with ease, and its fuel efficiency can power your home appliances through a blackout.

It is reliable and robust enough to handle construction sites with ease, and its fuel efficiency can power your home appliances through a power outage.


Low oil shutdown automatically
A cost-effective and affordable generator
It comes with plenty of accessories, including an oil funnel, spark plug wrench, toolset, and owner’s manual


Runtime is almost 25% shorter than similar models

6. Westinghouse iGen4500 – Best 4000 Watt Quiet Generator

Westinghouse iGen4500 - Best 4000 Watt Generator
Displays with LEDs
Noise levels are very low here
Easy to use

Westinghouse’s powerful generator is well-suited for most uses, but expect to pay a premium for its wide array of features. The generator offers 3700 watts of continuous power and 4500 watts of surge power, a differential wide enough to start motor-driven appliances without unplugging everything else.

With its four-stroke engine, this generator is extremely fuel-efficient – it boasts a massive 18-hour runtime while using just 3.4 gallons of gasoline.

Users have been blown away by how quiet this generator is. As the quietest generator we reviewed, it is also more than 10 dB quieter than the average for generators in this class. 

Users appreciated that the generator had both electric and recoil start options so that there was always a backup if the generator’s battery ran out.

There are two 120V household outlets, a 30A outlet, a 12V DC outlet, and two USB ports for charging small electronics on the generator’s face. One of the biggest drawbacks of this generator is that it does not have an RV-ready outlet. 

With the LED display, users can easily see how many watts the unit is drawing and how much runtime is left based on fuel consumption.

Residential users of the Westinghouse iGen4500 will receive a three-year warranty from Westinghouse, but commercial users will receive only a one-year warranty.


Fuel-efficient with an 18-hour runtime
Just 52 dB of noise
Electric and recoil starters
Displays with LEDs
Noise levels are very low here
Easy to use


There is no RV-ready outlet
Heavier side

7. Pulsar PG4000iSR – Best 4000 Watt Inverter Generator

Pulsar PG4000iSR - Best 4000 Watt Generator
Parallel processing
Smoother power is produced by inverter technology
Adapts engine speed automatically
Easy portability

Pulsar’s compact generator differs from the others we reviewed by having a single handle across the top and integrated plastic wheels rather than a full metal frame. Together with the telescoping handle, this is one of the most portable 4000-watt generators available.

It has a 224cc engine, but only provides 4000 watts of surge power and 3500 watts of continuous power, so it is not ideal if you have many motorized appliances to power. 

Running the Pulsar PG4000iSR at half load for 15 hours uses 3.4 gallons of gas, which is the middle of the road in terms of fuel efficiency and runtime. The generator makes a lot of whining noises even when running at or near its rated power level, although the noise level is not extreme at just 63 dB. Despite this, users were pleased with the electric start and liked the fact that they could start the generator remotely with the included controller.

With an RV twist-lock outlet and a USB port for charging small electronics, the outlet panel is relatively well-equipped. In addition to the 12V DC outlet for charging batteries, this generator is portable, making it perfect for use in an RV or on road trips. It does, however, have only two 120V outlets.

The Pulsar generator comes with a two-year warranty, and most hardware stores and repair shops carry parts for this brand.


The telescoping handle makes it highly portable
Remote-controlled electric start
A 12V DC outlet, a USB port, and an RV outlet


Surge power of only 4000-watts
When near capacity, it makes a whining noise
There are only two 120V outlets

8. Westinghouse iPro4200 – Best 4000 Watt Generator in 2022

Westinghouse iPro4200 - Best 4000 Watt Generator
Two USB ports and six 120V outlets
Noise level less than 59 dB quiet
The running time on one tank is long

With six 120V household outlets and two USB charging ports, this generator from Westinghouse is ideal for home use during a power outage when you need as many outlets as possible. Nevertheless, the generator does not come with a 30A outlet, 12V DC outlet, or RV-ready outlet as found on most other generators, so its range of use is considerably limited.

The iPro4200 can generate up to 3500 watts of continuous power or 4200 watts of surge power, which is enough to power all the essential appliances in your home in the event of a power outage. In addition, the generator is extremely fuel-efficient at half load, taking only 2.6 gallons of gas to run for up to 15 hours. 

The generator is also quiet, ranging between 52 and 59 dB depending on its power draw. Due to the low noise level, it was sometimes possible to use it overnight without waking up the house or neighbors.

It does not have an electric start, which is one of the biggest requests from users. The LED panel that shows the generator wattage, as well as remaining runtime, was appreciated, however.

This generator is covered by a three-year warranty for residential users, but only one year for commercial users.


The controls are easy to use
Transport is easy


There are no 30A, 12V, or RV-ready outlets
There is no electric start

9. WEN 56475 – Best 4000 Watt Generator in 2022

WEN 56475 - Best 4000 Watt Generator
Powerful 4750-watt surge
Twist-lock 120V RV outlet
The frame includes wheels
Electric start

When you need to push the limits of what a generator in this size class can do, this heavy-duty generator from Wen is ideal. With a continuous power rating of 3750 watts and a surge power rating of 4750 watts, this generator has the best surge power of any 4000-watt generator we’ve reviewed. 

But all that power comes with a price: the generator has relatively poor fuel efficiency, guzzling its entire four-gallon fuel tank in just ten hours at half load.

It is easy to start this generator using the electric start, even when it is cold, which is greatly appreciated by users. There is a 120V twist-lock outlet on the face of the generator, although the frame may be too large for an RV. 

On the one hand, the wheels make the generator more portable for transporting around camp, but on the other hand, they add to its size and bulk. The generator also has only two standard 120V outlets and no 12V DC outlet for charging a battery.

Although the WEN56475 is CARB and EPA certified for low emissions, users pointed out that it can be extremely loud compared to other generators of this size. It produces 68 dB of noise when operating, enough to cause complaints if used at night around a campsite. There is a two-year warranty on this generator from Wen.


The device operates silently
The program is very easy to use
Suitable for powering sensitive electronics
Fuel and power meters


Start with an electric motor without a 12V DC outlet
68 dB loud
With a short runtime of 10 hours, this gas guzzler consumes a lot of gas

10. XtremepowerUS 4000-Watt Gasoline Generator – Best 4000 Watt Generator in 2022

XtremepowerUS 4000-Watt Gasoline Generator - Best 4000 Watt Generator
It’s easy to move
Easy to use
A great deal

Gas generators like this one from XtremepowerUS are impressive. There is a 212cc engine that will be able to fulfill all of your needs. With this device, you not only get reliable power, but also a high level of usability.

The generator is surprisingly portable, though it has a high power level. The generator is lightweight, with wide handles. Putting it somewhere you need shouldn’t be too difficult for two people.

It is one of the biggest disadvantages of portable generators is that they can be unbearably loud. All generators will make plenty of noise, but this one is a little quieter than most. 67dB means you don’t have to worry about drowning out other sounds and having to shout.

Although it isn’t the most powerful generator, it is ideal for camping, construction sites, tailgating, and parties. There have been some delivery issues reported by a few users, but this does not appear to be a common issue.

This model is very easy to start thanks to the recoil start. Compared to some other generators available on the market, it requires minimal effort. In addition to this, the price is very attractive, making it excellent value for money.


Power for sensitive electronics that is safe
Run time is long
Relieves you of the stress of relying on others
Smart engine control system


Problems with delivery
The power level is lower

4000 Watt Generator: Buying Considerations

You should do your research before purchasing a generator since they are a big investment. By identifying your needs, you can find a generator that fits your budget and meets all of your needs.

Its Use

Are you planning to use your generator for camping, RV travel, or home use? Wheeled generators are better for camping, while heavy models are better for use at home as a backup. The use of the device will determine many other factors, including noise, portability, and outlet requirements.

Price of Generator

A generator that meets your needs and is within your budget is ideal. Shop around to find a good quality option at the top end of your budget instead of buying the cheapest generator.

Portable generators run much louder than inverter generators, which can run as quietly as 50 dB. If you are planning to sleep near your generator and are fine with slightly lower power output, go for a quieter option.

Its Fuel Type And Availability

Most of the generators we’ve reviewed run on gasoline, but others may run on alternative fuels, such as propane. Check if you can easily purchase the fuel you need. You may want to consider a dual fuel generator for versatility.

Runtime Details

Runtime depends on the size and efficiency of the fuel tank. If you run a five-gallon tank for 14 hours, you won’t be as efficient as a four-gallon tank for 12 hours, and you will spend more money in the long run.

About Outlets 

Generators typically come with 120V outlets, so it’s the extra features that make the difference. Others prefer to have an additional USB outlet for charging electronic devices.

Detail of Size, Weight, And Portability

Typical conventional generators are large, heavy, and difficult to transport, which makes them unsuitable for rough terrain. If you want a stationary generator, size won’t matter, but it will be a huge factor if you’re going camping or RVing.

Check Warranty

Make sure you understand the warranty’s terms and conditions. Most manufacturers offer a three-year warranty, but some offer replacements for the first year, and only repairs after the replacement warranty has expired.

It's Carl Denis here, and I'm glad you found my site. As a generator enthusiast, I write on MyGeneratorLab. In spite of our trusty RV being used virtually every day on worksites, my wife and I go on road trips every weekend with our family in it. As part of my mission, I aim to provide information that will assist you in choosing the right generator.

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