Best 4000 Watt Generators: 5 In-Depth & Buyer’s Guide

A 4000-Watt generator is an ideal piece of equipment to have in storage in case of a power outage. Whilst it may not be able to restore complete power to your home or RV, it will provide enough converted electricity to power the essentials, such as your refrigerator and stove. 

Generators and, in particular, portable generators have surged in popularity in recent years.

With outdoor activities such as camping becoming increasingly popular, and more people being made aware of this simple solution to their power emergencies, there are more generators than ever available on the market. 

This is great in that it offers you plenty of choice, but it can also make the process of choosing your perfect generator more complicated. 

To make your life easier, we’ve created a list of the best 4000-Watt generators for your backup power requirements.

We’ve also put together a buyers guide and FAQ section to help you out if you need any further guidance. 

Don’t get caught out without a backup power source. To get your hands on the best 4000-Watt generator as quickly as possible, check out our top choice: 

Champion 4000-Watt RV Ready DH Series Open Frame Inverter

  • Safe for sensitive electronics 
  • 17-hour running time 
  • Quiet technology 
  • Single control panel for ease-of-use
  • Multiple power outlets 
  • Parallel-ready 
  • Includes charging cables, a USB adapter, and oil funnel
  • Can be purchased with storage cover


Champion Power Equipment 100302 4000-Watt RV Ready...

Champion’s 400-Watt RV Ready Open Frame Inverter uses an advanced design that is 20% lighter and 50% quieter than traditional Champion generators of the same Wattage. 

This generator runs on gasoline for up to 17 hours at a time. It has a starting Wattage of 4000 Watts and a running Wattage of 3500. 

The multiple outlets included in this generator include a 120-volt and 30 Amp outlet for RV use and 2 120-volt and 20 Amp outlets for the home. There is also a 12-volt DC (direct current) outlet. 

The Champion RV Ready generator produces clean power with less than 3% THD, making it safe for sensitive electronics. There is also an Economy Mode feature that minimizes fuel consumption and extends engine life. 

A particularly useful feature of this Champion generator is its parallel-ready status. This means that the generator can be connected to either 1 or 2 2800-Watt inverters for an extra power boost. 

Additionally, the generator comes fully assembled, so all you need to do is add gas and oil to start using it straight away.

This ease-of-use is further enhanced by the intuitive display of the single control panel, which makes using the settings as simple as possible. 

With the purchase of this generator, you will receive the necessary charging cables, a USB adapter for the DC outlet, and an oil funnel for fueling up.

There is also an option to select that allows you to purchase the generator with a protective storage cover.


  • Safe for use with sensitive electronics
  • 50% lighter than other Champion 3500-Watt generators
  • 17-hour running time
  • Uses quiet technology
  • Single control panel
  • Multiple power outlets for RV and home use
  • Parallel-ready for extra power
  • Includes charging cables, a USB adapter, and an oil funnel
  • Can be purchased with a storage cover 


  • Some customers find the generator to be too loud despite the quiet technology 


WEN GN400i RV-Ready 4000-Watt Open Frame Inverter...

This generator from WEN produces 4000 surge Watts and runs at 3500 Watts. It produces clean power that is safe for sensitive electronics, so you can use it to charge your phone, tablet, or laptop as well as provide RV or home power in an emergency. 

The reason for this generator’s multiple application is its several outlets, which include an RV-ready TT-30R outlet, as well as 2 USB ports running at 5 volts each. There are also 2 120-volt 5-20R outlets. 

This generator’s design is both portable and relatively lightweight, measuring just 18.9 x 13.9 x 19.8 inches and weighing 66.1 lbs. 

The panel of this generator is parallel-ready and compatible with up to 2 WEN inverter generators for more power output. 

All of the controls for this generator are displayed on a single control panel for easy accessibility. These settings include an ‘eco-mode’ switch for fuel efficacy. 

Safety features of this generator include an automatic shutdown feature when oil and fuel levels get too low, as well as indicator lights that allow you to monitor the status of your generator. There is also built-in overload protection to prevent short-circuiting and overheating. 

If you wish, you can also purchase this generator alongside a storage cover to keep it protected when not in use. 


  • Safe for sensitive electronics
  • Multiple power outlets
  • Parallel-ready
  • Lightweight and compact
  • Single-panel control display
  • Eco mode for fuel efficacy
  • Built-in overload protection and automatic shutdown
  • LED indicator lights for monitoring
  • Can be purchased with a storage cover 


  • Lack of wheels makes maneuvering more difficult


DuroStar DS4000S Portable Generator, Yellow/Black

Durostar’s DS4000S portable generator runs at 3300 Watts but has a starting Wattage of 4000 Watts. 

The outlets featured on this generator include 2 outlets for household power, running at 120 volts each, and a 120-volt, 30 Amp outlet with a twist-lock for safety. A voltmeter is also included for monitoring purposes. 

As well as monitoring your voltage, this generator allows you some extra peace of mind with its automatic low-oil shut-off feature. 

The fuel tank of this generator is sizeable, holding up to 3.9 gallons, meaning that the generator can run for 8 hours at a time on a half-load. 

Fuel capacity isn’t the only feature Durostar has been generous with. When you buy the generator, you also receive a toolset, sparkplug wrench, and an oil funnel. 

The main downside to this otherwise brilliant generator is that, compared to some of the other generators on this list, it is heavier and less compact.

Weighing 91 lbs and measuring 17 x 17 x 24 inches, this generator, unfortunately, isn’t the easiest to transport and move around, especially considering the fact that the compatible wheel kit needs to be purchased separately. 


  • Multiple power outlets
  • Voltmeter included
  • Low-oil shut-off feature
  • Large fuel tank
  • Includes oil funnel, toolset, and sparkplug wrench


  • Quite heavy compared to other generators
  • Wheel kit must be purchased separately


Champion Power Equipment 100573 4000-Watt DH...

If you’re thinking that this Champion 4000-Watt generator looks very similar to our previously reviewed Champion generator, you’d be right. 

This generator has many of the same features as the Champion inverter reviewed above, but with a couple of very important variations that make this model worthy of its own place amongst our best 4000-Watt generators. 

Like the previous Champion model, Champion’s 100573 generator runs at 3500 Watts with a starting wattage of 4000 Watts. The amount of power output can be increased using the Parallel Kit, which is available for purchase separately, which allows for the connection of 2 2800-Watt + inverters. 

It also has a 17-hour run time when powered by gasoline and operates quietly due to Champion’s use of quiet technology. 

In terms of outlets, the generator includes 2 120-volt, 20 Amp outlets, a 120-volt, 30 Amp RV outlet, and a 12-volt, 8 Amp DC outlet. These power outlets produce clean power that is safe for sensitive electronics.

The Economy Mode setting allows for optimal fuel efficacy, while the low-oil shut-off function ensures the safety of the engine. 

The best thing about this generator, however, is its Wireless Remote Start feature. This feature allows you to start and stop the operation of your generator from a distance of 80 feet using the remote key fob.

Not only is this convenient, but it’s also a great feature in terms of safety because it allows you to stay well away from your generator while it’s running, avoiding potential carbon monoxide inhalation. 

Additionally, for maximum portability, this generator includes a wheel kit and handle. This makes the 96.8 lbs and sizeable dimensions of this generator much easier to transport.

You will also receive charging cables and a USB adapter. 


  • 17-hour run time
  • Wireless remote start/stop
  • Uses quiet technology
  • Multiple power outlets
  • Low-oil shut-off
  • Clean power for sensitive electronics
  • Parallel-ready
  • Includes wheel kit and handle
  • Includes charging cables and USB adapter 


  • The weight makes this generator difficult to move, even with wheels


XtremepowerUS’s 4000-Watt Gasoline Generator isn’t often featured on lists of the best 4000-Watt generators, but we felt it deserved to be mentioned due to its reliability as an effective source of backup power. 

The 4000-Watt gasoline-powered engine runs at a rating of 3500 Watts and has a convenient run time of 10 hours. 

The control panel includes circuit-breakers and a voltmeter alongside multiple power outputs. These include a 120-volt output with a twist lock, and 2 120-volt, 20 Amp outputs. 

Because this generator produces clean and stable power, it is suitable for charging your more sensitive electronics as well as more heavy-duty household and RV appliances. 

Along with this generator, you will receive assembly hardware, a gasoline generator, and a sparkplug wrench. 

The only real downside to this generator is its weight. At 105 lbs, you may find this generator a little more difficult to transport than other models. 


  • 10-hour run time
  • Includes voltmeter
  • Multiple power outputs
  • Safe for sensitive electronics
  • Includes hardware, sparkplug wrench, and gasoline generator 


  • Very heavy
  • Some reports of damage on arrival

Best 4000 Watt Generators Buying Guide


Although all of the generators on our list are classified as 4000-Watt generators, their starting and running Wattages vary slightly.

For example, some may have a starting Wattage of 4000 Watts but a running wattage of 3500. Other generators may have a slightly higher starting Wattage, for example, 4500 Watts, and a running wattage of 4000. 

It is important to be aware of this going into the selection process so that you can choose the generator that best corresponds to your needs. 


Of course, you will need to make sure that the generator you choose is compatible with the electronics and appliances you want to power. 

The best way to tell whether a generator will be compatible with your appliances is to look at the power outlets included in the machine. 

All of the generators on our list feature multiple power outlets for added flexibility in terms of the kind of appliances you can connect. 120-volt, 20 Amp outlets, for example, are usually suitable for home use, while 120-volt, 30 Amp outlets may be included for RV use. Many generators also feature lower-voltage and amperage DC outlets for smaller appliances. 

Please do your due diligence and check the product guidelines carefully before use to determine which outlet is suited to which purpose. 

Speaking of compatibility, if you anticipate needing to charge phones, tablets, and laptops from your generator, you will need to make sure that the generator provides clean, stable power, and is advertised as safe for sensitive electronics. 


Generators are most often used in 2 situations: to power a house during a power outage, or to provide power to RVs and camping equipment. 

In both of these scenarios, portability is essential. Generators must always be used at least 20 feet from your home and any doors and windows to avoid carbon monoxide poisoning (see Frequently Asked Questions below). Therefore, you always need to be able to transport your generator over distances of at least 20 feet. 

When it comes to camping and other outdoor excursions, portability is even more important. 

There are a few features to look out for in 4000-Watt generator models that will ensure easy transportation and maneuverability. 

Lightweight designs are a good starting point for portability, but it should be noted that a ‘lightweight’ generator is still likely to weigh 60 lbs or more. Therefore, it is also wise to prioritize features such as handles and wheels. Wheel kits are sometimes included with generators, which is ideal. Alternatively, compatible wheel kits are often sold separately by the manufacturer. 

Also bear in mind that the more compact the generator’s design, the easier it will be to store. This is an essential factor to consider for RV use specifically. The smaller the measurements, the easier and less cramped your camping experience will be. 


All generators use some form of fuel to provide the energy required for electrical conversion. However, the type of fuel used and the size of the fuel tank will vary from generator to generator. 

All of the generators on our list run on gasoline, which is ideal since gasoline is one of the cheaper and most widely accessible fuel types. 

Tank size is something that should be dictated by your own requirements, bearing in mind that a larger fuel tank typically means a longer run time. If you want to be covered in the event of a particularly long power outage, it’s best to opt for a larger fuel tank (for example, over 3 gallons) with a run time of over 12 hours. 

Safety Features

Safety is paramount when it comes to using a generator, and the inclusion of safety features on the generator itself can help to ensure that you get the most risk-free experience possible. 

Built-in overload prevention is important for reducing the risk of overheating and short-circuiting. A voltmeter can also help with this by allowing you to monitor the voltage of your generator during operation. 

An automatic shut-off function for when the fuel or oil levels of your generator get too low is a great feature to have and can be enhanced by the use of LED indicators. 

Remote-controlled start and stop functions also enhance the safety of your generator by allowing you to remain a safe distance from it at all times while it’s running. 

Additional Features

When purchasing a generator, it’s also a good idea to consider features and accessories beyond the generator itself. 

Accessories such as oil funnels can make refueling your generator much easier and less messy. 

Included charging cables and adapters facilitate the charging and powering process, maximizing compatibility and eliminating the need for separate purchases. 

As we’ve already mentioned, it’s also a good idea to look for included wheel kits for portability. 

Frequently Asked Questions

What are the benefits of a 4000 Watt generator?

You may be wondering what the benefits of a 4000 Watt generator are compared to other larger, more powerful generators. 

If you want to be able to power every appliance and system in your home during a power outage, you will definitely need a larger generator in the region of around 10000 Watts. 

However, the great thing about a 4000 Watt generator is that it will allow you to get by in an emergency with your most crucial appliances whilst being much more portable and inexpensive than more powerful generators. 

So, if you want a generator that will see you through an emergency, is easily transportable and maneuverable, and won’t cost you an arm and a leg, 4000 Watts is the way to go. 

Can I run my 4000 Watt generator in my shed or garage?

No, a generator of any size should never be used in enclosed spaces. This includes sheds and garages, even if all the doors and windows are open. 

This is because carbon monoxide, which is often produced by burning fuel, can easily build up in indoor spaces. Opening doors and windows will not provide sufficient ventilation to prevent this. 

Not only is carbon monoxide extremely flammable, but a buildup of the gas can lead to carbon monoxide poisoning. Carbon monoxide poisoning can lead to death in a matter of minutes if the concentration in the air is high enough. 

Therefore, generators should only ever be operated outside, and at least 20 feet away from any doors and windows.