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Best 4000 Watt Generator Reviewed for 2023

Last updated: November, 2023

Picking a 4000-watt generator to suit your needs can be daunting with so many on the market. Therefore, you should consider different factors before you buy one, such as the price, safety features, run time, noise level, and fuel choice.

We have considered all these criteria and compiled a list of the ten best 4000-watt generators in the US.

Most of these generators are inverter types and are a good match for an RV. Some units reviewed are also suitable for home backup.

Make sure to read the review of each 4000-watt generator to get a better idea of which model best fits you.

Westinghouse iGen4500

Westinghouse iGen4500

✅ Best 4000 Watt Generator ✅

4500 starting watts / 3700 running watts
Long Run Time – up to 18 hours
Inverter Technology
Very Quiet

2Pulsar 4000W

Pulsar 4000W

4000 starting / 3500 running watts
Inverter – Quiet and Suitable for Sensitive Electronics
RV Ready

3Champion 4000-Watt RV Ready

Champion 4000 Watt RV Ready Open Frame Inverter

4000 starting / 3500 running watts
RV Ready
Low Noise level
Affordable Price Tag

4Westinghouse iGen4200

Westinghouse iGen4200

Up to 18 hours run time
Suitable for portable electronics
CARB Compliant – Good for California

5WEN GN400i

WEN GN400i

Parallel Capability
Quiet Operation
Low Price

6DuroStar DS4000S

DuroStar DS4000S

Good for work
Automatic low oil shutdown

7Duromax XP4400E

Duromax XP4400E

Surge alternator to start up multiple appliances simultaneously
Spark arrestor

8Briggs & Stratton 30676

Briggs & Stratton 30676

Dual Fuel
Run time of up to 14 hours
30 Amp RV Outlet included

9Firman P03601

Firman P03601

Remote Start
Low Price Tag

10Sportsman GEN4000DF

Sportsman GEN4000DF

Dual Fuel
Affordable Price

Our Selection of the Best 4000 Watt Generator

Westinghouse iGen4500

Westinghouse iGen4500The Westinghouse iGen4500 makes our list for several reasons.

One of them is how quiet yet powerful it is. So if you are looking for a generator that can power an RV but produce little sound, this is the one to look closely at.

The iGen 4500 is a gas-powered portable inverter generator.

It runs at 3,700 watts but can reach up to 4,500 starting watts.

If you need a generator to run your RV air conditioner – the iGen4500 is the optimal choice.

It has enough power to run the entire large travel trailer.

The gas tank holds up to 3.4 gallons and runs for up to 18 hours, depending on the load.

The generator has a full LCD data display that you can use at the start of the electric push-button or the remote control.

It will tell you the current power output, run time, voltage, and fuel levels.

This portable generator has a telescoping handle with an additional top handle for easy portability.

Regarding noise level, the iGen4500 operates at a volume level as low as 53 dBA.

That makes it perfect if you are using it for outdoor activities or RV parks.

Total harmonic distortion (THD) measures the “purity” of the sinusoidal electric wave produced by a portable generator. The conventional portable generator usually has a THD of higher than 5%. This can potentially damage sensitive electronics like laptops or phones.

However, The Westinghouse iGen 4500 is an inverter generator that produces clean power at less than 3% THD. Therefore, you can use this inverter generator safely for electronics like cell phones, TVs, and computers.

The TT-30R 30 Amp RV outlet makes the portable generator easy to connect directly to a typical RV without buying any additional adapters.

In addition to the RV outlet, this excellent inverter generator includes 2 USB outlets and a 5-20R 120VR Duplex outlet. Westinghouse offers a 3-year warranty along with technical life support.

The only real disadventirelye of this inverter is that it can be quite on the heavy side, which is to be expected given its emitting power.

best 4000 watt generator - Westinghouse iGen4500

  • Quiet operation

  • Dedicated RV outlet
  • Very long runtime
  • Easy to start and run

  • A little heavy

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Pulsar 4000W Remote Start Generator

Pulsar 4000WThe Pulsar 4000W Remote Start Generator is a perfect inverter genesuitabler boasting a lot of advantages.

It is good for people who need the power for RVs, tailgating, or even as a backup for power outages.

This inverter has a single-cylinder, 4-stroke, OHV engine that produces 3,500 watts up to 4000 watts.

It produces around reasonably of sound at lower loads, making it relatively quiet when measured several feet away.

If you are looking for a quiet 4000-watt generator for RV camping, this one is one of your best options.

It has enough power to run the most demanding electric equipment, including a 13,500 BTU air conditioner.

The portable generator has a remote-control start, recoil, and electric start, so you don’t have to get up to turn it on.

The Pulsar has a 3.4-gallon tank and will run up to 12 hours. However, you would get up to 15 hours with the economy switch on.

It comes with a telescoping handle for portability which is ideal when camping or tailgating.

This inverter has five outlets with different voltages – two AC 120V outlets, one 30A RV outlet, one 12V DC 8A outlet, and a 5V DC USB charging point. So you can safely use it to power sensitive electronics like cell phones and computers.

The only disadvantage this inverter suffers from is the lack of an LCD letting you know the generator’s current status. In addition, it would be best to remember that the sound levels could be slightly loud at higher wattages, which is typical for portable generators.

  • Five outlets for powering all kinds of equipment

  • Quiet operation
  • Runtime up to 12 hours
  • RV outlet included

  • It can beLCDoud at higher wattages

  • Lack of LCD display

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Champion 4000-Watt RV Ready Open Frame Inverter

Champion 4000-Watt RV ReadyThe Champion 4000 watts is the 3rd best 4,000-watt generator.

It is a great and powerful generator for those wanting to power up their RV or need an inexpensive 4000-watt inverter generator to run their household appliances and sensitive electronic equipment.

The generator has a surge wattage of 4000 and running wattage of 3500.

The gas tank can hold up to 2.9 gallons and run up to 17 hours when the economy switch is activated.

It has a sensor for low oil that will turn off the portable generator when the oil levels drop to prevent damage to the engine.

This inverter produces a sound up to 64 dBA from 23 feet away, slightly louder than a group of people chatting.

When the economy mode is activated, the sound will be lower because the electrical load is reduced and idles the engine.

It has a Quick Touch Panel to give you easy access to the controls.

The Champion has four outlets with 120V 30A RV, two 120V 20A household outlets with less than 3% THD for sensitive electronics, and a 12V DC outlet with a dual USB adapter.

You can increase your power by connecting it to another inverter via a parallel kit. This solution would give you a whopping 8000 starting watts at your disposal.

Champion includes a 3-year warranty and lifetime technical support.

The only minor issue with this inverter is that even though it is reasonably quiet for its size, it can be teetering on the noise ordinances some campgrounds may have (usually 65 dB is the max threshold). However, the noise level won’t be a big problem for home backup or outdoor events.

Overall it is one of the best 4000-watt generators money can buy. Like with other inverter generators manufactured by Champion Power Equipment – you can’t go wrong with this unit.

  • It can run for up to 17 hours in the economy mode

  • 3-year manufacturer’s warranty with lifetime technical support.
  • Clean power – less than 3% THD for electronics like cell phones and computer
  • Pretty cheap for what you get!

  • Noise level slightly too high for some campgrounds

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Westinghouse iGen4200

Westinghouse iGen4200

The Westinghouse iGen4200 is the perfect inverter for those that need or want a versatile use.

We recommend it to those needing a generator for outdoor recreational use, RVs, and even home backup.

This inverter peaks at 4,200 watts and runs at 3,500 watts.

It has a very convenient push-button electric start.

The LCD shows your current status on run time, power output, fuel level, voltage, and low oil indicator. This inverter can run up to 18 hours on 2.6 gallons of gas with the eco mode on.

The sound levels at lower loads stay underneath 69 dBA.

The portable generator comes with a telescopic handle and wheels for easy transport.

It has a 5-20R 120V duplex household outlet, an RV-ready TT-30R outlet, and two USB outlets.

The iGen4200 is EPA and CARB-compliant, which is ideal for California residents.

It also comes with a 3-year warranty and lifetime technical support with various accessories such as a tool kit, oil funnel, and oil.

  • It runs 18 hours on eco mode

  • LCD shows the current status of the inverter
  • EPA and CARB compliant
  • Can power-sensitive equipment
  • Cheaper than many other inverters of this size

  • A bit on the heavier side

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WEN GN400i

WEN GN400iThe WEN GN400irobustur list as being lightweight yet powerful. Many small generators are great when running your sensitive electronic light combination of quiet and lightweight.

Compared to the typical open-frame generators, this generator weighs about 30% less than the standard units at 70.5 lbs.

It peaks at 4000 watts and runs at 3500 watts. You can double your total power output by connecting it to another generator via a Parallel Connection Kit. The 1.85 -gallon tank allows the inverter to run a total of 7 hours of run time.

The indicator lights let you know when you need more fuel or where there’s an issue with charging. The noise level for the Wen GN400i stays around 57 dBA which is much quieter and ideal for camping since many campgrounds have strict noise regulations.

This inverter produces less than 3% THD. So you can safely use it to run your sensitive electronics.

The control panel has two 120V NEMA 5-20R outlets, two 5V USB ports, and one 120V transfer switch-ready NEMA L5-30R twist-lock outlet. In addition, the WEN GN400i offers a 2-year manufacturer warranty and technical support.

One of the downsides to this inverter is the short run time compared to other models with similar wattage. This is understandable, given its smaller size. Another thing we miss is the lack of a remote start, but this is more of an issue of convenience than anything serious.

Price is a big selling point of this unit. In our opinion, it is the best 4000-watt generator in its low price range.

  • Lightweight compared to most models with similar wattage

  • Quiet – 57 dBA
  • Good for running sensitive electronics
  • Parallel capable

  • Small tank

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DuroStar DS4000S

DuroStar DS4000SThe DuroStar DS4000S packs a lot of punch to let you use it for various functions. If you are looking for a generator to be your home’s backup in the case of a power outage or for your construction worksite, then this is one you might want to take a closer look at.

This generator has a 3.96-gallon tank with a gauge, so you’ll never run empty. When running at 50% capacity, you can get 8 hours of continuous use.

It has an indicator light when oil is running low and will shut off automatically to protect your engine from damage.

The DuroStar DS4000S has got 4000 starting watts and 3300 running watts.

It weighs 94 lbs, making it a bit heavier than other generations.

When it comes to the noise level, it has sound levels of 69 dBA from 23 feet; this can be a problem for those who need a quiet generator for an RV since this is already quite loud compared to inverter generators.

The DuroStar has two 120V household outlets and one 120V 30A with a twist-lock outlet for RVs.

One strong selling point of this portable generator is its low price.

If you’re looking for an affordable 4000-watt generator for construction or home backup – you should consider Durostar DS4000S.

If you’re more interested in a quiet camping generator, you should look at inverter generators like Westinghouse iGen4500.

  • Great for worksites and backup for homes

  • Automatic low oil shutdown mechanism
  • Up to 8 hours of continuous use at 50% load

  • Not safe for charging sensitive electronics

  • Noisy compared to most generators at 69 dBA

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Duromax XP4400E

Duromax XP4400EThe Duromax XP4400E has a powerful engine that makes it great for emergencies like a power outage, but it’s also useful for outdoor activities like camping.

This gas-powered generator has a tank with up to 3.96 gallons of fuel. Fuel efficiency is a big selling point for this generator. You can expect a total run time of around 12 hours at 50% capacity.

The Duromax XP4400E is both EPA and CARB-compliant, meaning you can use this generator in California and national parks.

It weighs in at 120 lbs but does come with wheels and a handle for easy portability. This generator peaks at 4,400 watts and runs at 3,500 watts.

It starts by using a turnkey for an electric start, which is slightly different from many models that use recoil starters.

This generator isn’t the quietest compared to others we have reviewed, with its sound levels at 69 dBs. This is more like the sound of a car on a highway or a vacuum cleaner. This can present some issues depending on where you intend to use it.

It has three outlets, one 120/240V 30A twist lock outlet for RVs and two 120V 20A household outlets. It also includes a sparkplug wrench, toolset, DC cables, and an oil funnel.

Some of the downfalls to this generator are its inability to charge sensitive electronics (you need an inverter type) and the significant weight resulting from its engine size.

  • Fuel efficiency – run time of up to 12 hours at 50% capacity

  • Peak wattage at 4,400 watts
  • EPA and CARB compliant

  • The weight and bulkiness can be a bit of a detriment at 120lbs

  • Can’t charge sensitive electronics like cell phones or computers

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Briggs & Stratton 30676

Briggs & Stratton 30676

The Briggs & Stratton 30676 is ideal for those who love traveling in their RVs because suitable for its portability and power.

It’s also suitable for those who want to keep a backup generator during a power outage.

It’s powerful enough to run an air conditioner and other major appliances.

An OHV 4-strong engine powers the Briggs & Stratton. It peaks at 4,375 watts and runs at 3,500 watts.

It has a power surge alternator produces up to 25% more wattage to start large appliances and tools simultaneously.

It starts by using a recoil start which is comparable to many models of a similar nature. This generator has a 5-gallon tank and can run up to 14 hours at 50% capacity.

While the Briggs challenging weighs in at 114lbs and can be difficult to carry around, it does come with 7in wheels for easy transporting. In addition, it comes with three outlets, two 120V household outlets, and one 120V-20/30A RV outlet.

This generator isn’t EPA or CARB-compliant, but it does have a spark arrestor that helps prevent forest fires.

It does come with a 2-year limited warranty.

This generator overall is worth it if you are an avid traveler in your RV.

Its limitation is the lack of a low oil indicator, so you’ll have to take extra caution to avoid damage to the engine; you cannot power sensitive electronics like cell phones or computers.

  • Peaks at 4,375 watts on propane

  • It can run up to 14 hours with 50% capacity.
  • It has a surge alternator to start up multiple appliances simultaneously.
  • It comes with a spark arrestor which is great for camping

  • Lack of a low oil indicator

  • Can’t power up any sensitive electronics

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Firman P03601

 Firman P03601

The Firman P03601 is a portable generator ideal for job sites and RV camping.

It will help power your electrical tools, and if you need to use it in an emergency or a power blackout, it will power some appliances like a refrigerator.

This generator peaks at 4,550 watts and runs at 3.650 watts. It comes with a Firman Volt Lock, an automatic voltage regulator that ensures the power output is always consistent.

The gas tank holds 5 gallons of gas and has a run time of up to 14 hours with a 50% capacity.

It weighs 110 lbs and doesn’t come with wheels. The dedicated kit is available for purchase separately.

It comes with a 4-In-1 Data Minder that continuously measures your current volts, hertz, hours, and a low oil indicator to check your levels.

It also has an electric start button for convenience.

The sound levels are silenced by the Whisper Series muffler that runs at 68 dBA, which is quieter than a vacuum, but it may be worth checking any campgrounds you visit to see if this meets their noise ordinance.

The generator has four outlets – two 5-20R 20A-120V, one TT-30R 30A-120V RV ready, and one L5-30R 30A-120V twist lock. It also comes with oil, a funnel, and a spark plug wrench.

The drawbacks of this generator are that you will have to carry it around unless you purchase a wheel kit, and it can be a little noisy compared to others.

    • Run time of 14 hours

    • Comes with accessories
    • Remote StIt weighsi2pros]
    • No wheels included

    • Weighs quite a bit

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    Sportsman GEN4000DF

    Sportsman GEN4000DFThe Sportsman GEN4000DF is perfect for those who want a generator that will be there for them in an emergency blackout and those who want the flexibility to use multiple methods to power the generator.

    It can even be used for some outdoor activities too. This generator can be run on either gas (tank is 3.6 gallons) or propane.

    It has a run time of up to 10 hours with 50% capacity. It has a 212cc OHV engine that is EPA approved and has a peak of 4000 watts with a rated power output of 3500.

    It weighs 90 lbs, much lighter than the others on the market.

    The startup is done by recoil start, which is common among most generators. The sound levels are less than 69 dBA, so it’s about average for sound with other models.

    It comes with six outlets altogether. These are four 120V outlets, one 120V RV outlet, and one 12V DC outlet. In addition, this generator has some safety features, including a low oil indicator that will automatically shut off to protect the engine and a circuit breaker that will protect appliances in the event of an overload.

    The Sportsman even comes with a regulator hose kit for the propane hookup. The only real major drawback to this generator is the lack of wheels. Since the generator is quite heavy, you should purchase a wheel kit too.

    • Flexibility to use either gas or propane

    • It has safety features to protect your items and the generator itself
    • Cheap
    • Lighter than most generators

    • It doesn’t include a wheel kit for easy transport

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    Frequently Asked Questions

    What can a 4000-watt generator power?

    A 4000-watt generator can power all major appliances in an RV. These include a 13,500 BTU air conditioner, refrigerator, TV, and lighting circuits.

    You can also use a 4000-watt generator as a home backup power supply during emergencies like hurricanes.

    What will a 4000-watt generator run in a house?

    In the event of a storm or other disaster causing a significant power blackout – a 4000-watt generator will help you run the essential items in your home.

    A 4000-watt generator provides enough power to run a home refrigerator, freezer, and a few other selected items in your household.

    While you can’t expect such a generator to power your entire house, it’s big enough to power the essentials.

    4000-watt generator –  how many amps is that?

    Four thousand watts equals roughly 33.3 amps at 120 volts. Some 4000-watt generators also offer 240V outputs, in which case you would get around 16.6 amps.

    9.8 Total Score
    Westinghouse iGen4500 - Recommended Choice