Best 4000 Watt Inverter Generator Reviews 2020

When you have a generator, you can make a big difference whenever power goes off or when going for a camping trip or outdoor adventures. Investing in the best 4000 watt inverter generator will help offer enough power that will ensure all your essential appliances like lights, water pumps, refrigerator or freezer are up and running for the entire power outage period.  This best 4000 watt inverter generator will also offer the best power amount to help power up medium sized RV together with electrifying the camp site.

Our top pick for the overall best 4000 watt inverter generator is the Champion 4000-Watt Open Frame RV Inverter Generator. It has an innovative inverter open frame design. It is able to perform well and provides an eco-mode together with a clean power output and an extended running time. It comprises of convenient and useful features like reliable recoil start fast touch panel and low oil shut off sensor.

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Consumers Review

Product Image
Top Pick
Champion 4000-Watt RV Ready DH Series Open Frame Inverter with Quiet Technology
Westinghouse iGen4500 Super Quiet Portable Inverter Generator 3700 Rated & 4500 Peak...
WEN GN400i RV-Ready 4000-Watt Open Frame Inverter Generator, CARB Compliant,...
Champion Power Equipment 100573 4000-Watt DH Series Open Frame Inverter, Wireless...
Briggs & Stratton P4500 Power Smart Series Inverter Generator | Electric Start, CO...
Running watt
3500
3,700
3500
3500
3700
Starting watt
4000
4,500
4000
4000
4500
Engine(cc)
224cc
224cc
212cc
224cc
224cc
Voltage & Amp@RV
120V 30A
120V 30A
120V 30A
120 30A
120 30A
Voltage & Amp@Houshold
120V 20A
120V 20A
120V 20A
120V 30A
120V 20A
Voltage & Amp@Locking
120V 30A
120V 30A
120V 30A
120V 30A
120V 30A
Fuel Sources(Duel Fuel/gas)
gasoline
gasoline
gasoline
gasoline
gasoline
Fuel Tank Capacity
2.9 gal.
3.4 gal.
1.85 gal.
3.4 gal.
3.5 gal.
Fuel Consumption
2.9 GPH
0.19 GPH
0.26 GPH
2.9 GPH
0.22 GPH
Sound/Noise Level(dBA)
64 dBA
52 dBA
52 dBA
64 dBA
66 dBA
Running Time@1/2 load
17 hours
18 hours
7 hours
17 hours
16 hours
USB Port(DC-Supply)
2
2
2
2
2
Weight
81.6 pounds
98 Pounds
70.4 pounds
93 pounds
115 pounds
Dimension
20.5 x 17.9 x 17.7 inches
18 x 10 x 15.5 inches
19.8 x 13.8 x 18.9 inches
18 x 10 x 15.5 inches
24.5 x 17.6 x 20.3 inches
Warranty
3 years
3 years
2 years​
3 years​
3 years
Prime Status
-
Top Pick
Product Image
Champion 4000-Watt RV Ready DH Series Open Frame Inverter with Quiet Technology
Running watt
3500
Starting watt
4000
Engine(cc)
224cc
Voltage & Amp@RV
120V 30A
Voltage & Amp@Houshold
120V 20A
Voltage & Amp@Locking
120V 30A
Fuel Sources(Duel Fuel/gas)
gasoline
Fuel Tank Capacity
2.9 gal.
Fuel Consumption
2.9 GPH
Sound/Noise Level(dBA)
64 dBA
Running Time@1/2 load
17 hours
USB Port(DC-Supply)
2
Weight
81.6 pounds
Dimension
20.5 x 17.9 x 17.7 inches
Warranty
3 years
Prime Status
Available
Product Image
Westinghouse iGen4500 Super Quiet Portable Inverter Generator 3700 Rated & 4500 Peak...
Running watt
3,700
Starting watt
4,500
Engine(cc)
224cc
Voltage & Amp@RV
120V 30A
Voltage & Amp@Houshold
120V 20A
Voltage & Amp@Locking
120V 30A
Fuel Sources(Duel Fuel/gas)
gasoline
Fuel Tank Capacity
3.4 gal.
Fuel Consumption
0.19 GPH
Sound/Noise Level(dBA)
52 dBA
Running Time@1/2 load
18 hours
USB Port(DC-Supply)
2
Weight
98 Pounds
Dimension
18 x 10 x 15.5 inches
Warranty
3 years
Prime Status
Available
Product Image
WEN GN400i RV-Ready 4000-Watt Open Frame Inverter Generator, CARB Compliant,...
Running watt
3500
Starting watt
4000
Engine(cc)
212cc
Voltage & Amp@RV
120V 30A
Voltage & Amp@Houshold
120V 20A
Voltage & Amp@Locking
120V 30A
Fuel Sources(Duel Fuel/gas)
gasoline
Fuel Tank Capacity
1.85 gal.
Fuel Consumption
0.26 GPH
Sound/Noise Level(dBA)
52 dBA
Running Time@1/2 load
7 hours
USB Port(DC-Supply)
2
Weight
70.4 pounds
Dimension
19.8 x 13.8 x 18.9 inches
Warranty
2 years​
Prime Status
-
Available
Product Image
Champion Power Equipment 100573 4000-Watt DH Series Open Frame Inverter, Wireless...
Running watt
3500
Starting watt
4000
Engine(cc)
224cc
Voltage & Amp@RV
120 30A
Voltage & Amp@Houshold
120V 30A
Voltage & Amp@Locking
120V 30A
Fuel Sources(Duel Fuel/gas)
gasoline
Fuel Tank Capacity
3.4 gal.
Fuel Consumption
2.9 GPH
Sound/Noise Level(dBA)
64 dBA
Running Time@1/2 load
17 hours
USB Port(DC-Supply)
2
Weight
93 pounds
Dimension
18 x 10 x 15.5 inches
Warranty
3 years​
Prime Status
Available
Product Image
Briggs & Stratton P4500 Power Smart Series Inverter Generator | Electric Start, CO...
Running watt
3700
Starting watt
4500
Engine(cc)
224cc
Voltage & Amp@RV
120 30A
Voltage & Amp@Houshold
120V 20A
Voltage & Amp@Locking
120V 30A
Fuel Sources(Duel Fuel/gas)
gasoline
Fuel Tank Capacity
3.5 gal.
Fuel Consumption
0.22 GPH
Sound/Noise Level(dBA)
66 dBA
Running Time@1/2 load
16 hours
USB Port(DC-Supply)
2
Weight
115 pounds
Dimension
24.5 x 17.6 x 20.3 inches
Warranty
3 years
Prime Status
Available

01. Champion 4000-Watt Open Frame RV Inverter generator

Salient Feature

  • Running watt: 3500
  • Starting watt: 4000
  • Engine(cc): 224cc
  • Voltage & Amp@RV: 120V 30A
  • Voltage & Amp@Houshold: 120V 20A
  • Voltage & Amp@Locking: 120V 30A
  • Fuel Sources(Duel Fuel/gas): gasoline
  • Fuel Tank Capacity: 2.9 gal.
  • Fuel Consumption: 2.9 GPH
  • Sound/Noise Level(dBA): 64 dBA
  • Running Time@1/2 load: 17 hours
  • USB Port(DC-Supply): 2
  • Weight: 81.6 pounds
  • Dimension: 20.5 x 17.9 x 17.7 inches
  • Warranty: 3 years

The Champion 4000-Watt Open Frame RV Inverter is priced moderately and all round performer which was specifically designed to be used at home.

Power Output

It is good at offering power whenever there is a power outage or for daily use.  With a rating of over 3500 watts for continuous output power and a surge output of 4000 watts, you might encounter issues when it comes to starting different appliances that are motor driven.  As a user of this generator, be sure to be pleased with its clean electrical waveform. The generator will allow for safe use when it comes to charging or powering of all the sensitive electronics.

It uses on two 120 household outlets.  The users of the RV did appreciate it being RV ready twist lock outlet.

Fuel Efficient

This Champion 4000-Watt Open Frame RV Inverter is also preferred by most homeowners since it is fuel efficient at approximately half load. This generator can easily run for up to 17 hours by using up to 3 gallons of gas. There are Champion 4000-Watt Open Frame RV Inverter who have noted that this machine is quite noisy early morning or evening when being used at camp site.  With a 64Db, most of its users did wish for it to have an electrical start function despite finding out that it did have a reliable and responsive recoil start.

Pros

  • Comes with a three year warranty period
  • It is fuel Efficient
  • Has a clean electrical wave form
  • Quite affordable

Cons

  • Comes with only two 120 volt outlets
  • Quite noisy in the morning and evening

02. Westinghouse iGen4500 Portable Inverter Generator

Salient Feature

  • Running watt: 3,700
  • Starting watt: 4,500
  • Engine(cc): 224cc
  • Voltage & Amp@RV: 120V 30A
  • Voltage & Amp@Houshold: 120V 20A
  • Voltage & Amp@Locking: 120V 30A
  • Fuel Sources(Duel Fuel/gas): gasoline
  • Fuel Tank Capacity: 3.4 gal.
  • Fuel Consumption: 0.19 GPH
  • Sound/Noise Level(dBA): 52 dBA
  • Running Time@1/2 load: 18 hours
  • USB Port(DC-Supply): 
  • Weight: 98 Pounds
  • Dimension: 18 x 10 x 15.5 inches
  • Warranty: 3 years

This Westinghouse iGen4500 does feature a total of six household outlets and comes with two USB ports for charging. These two features make this inverter generator rank top among the wide variety of 4000 watt inverter generators in the market.  This machine does not however comes with a 30A outlet, RV ready outlet or a 12V DC outlet which is always available in other generators available in the market.  This makes it remain limited in the roles it can be used for.

Power Output

With a power rating of 3500 watts of continuous power or a surge power of up to 4200 watts, this Westinghouse iGen4500 has lots of juice to cover all the other home appliances in case of outage in power.  However, this inverter generator is fuel efficient which makes it stands out from the rest of generators in the market. It is capable of taking up to 2.6 gallons of gas to keep it running for a total of 15 hours.

Noise Level

Most homeowners are known to prefer investing in Westinghouse iGen4500 since it is very quiet in operation. Its low noise levels means that you can always use it overnight without being woken up by fellow house partners or neighbors.  The sound levels produced by this generator ranges between the 52 dB and 59 dB depending on the draw of power.

However, this generator lacks an electric start which is one of the biggest requests from most of its users.

Pros

  • Comes with up to 120V outlets
  • It has a total of two USB ports
  • It is very quiet
  • Fuel efficient

Cons

  • It does not have an electric start
  • There are no RV ready outlets

03. WEN GN400i 4000-Watt Inverter Generator

Salient Feature

  • Running watt: 3500
  • Starting watt: 4000
  • Engine(cc): 212cc
  • Voltage & Amp@RV: 120V 30A
  • Voltage & Amp@Houshold: 120V 20A
  • Voltage & Amp@Locking: 120V 30A
  • Fuel Sources(Duel Fuel/gas): gasoline
  • Fuel Tank Capacity: 1.85 gal.
  • Fuel Consumption: 0.26 GPH
  • Sound/Noise Level(dBA): 52 dBA
  • Running Time@1/2 load: 7 hours
  • USB Port(DC-Supply): 
  • Weight: 70.4 pounds
  • Dimension: 19.8 x 13.8 x 18.9 inches
  • Warranty: 2 years

This WEN GN400i 4000-Watt Inverter Generator is well known for being powerful yet very lightweight. When compared to other open frame generators, this inverter generator is 30% lighter than other standard units which eight 70.5 lbs.

Power Output 

This WEN GN400i 4000-Watt Inverter Generator does peak at 4000 watts and can run up to 3500 watts.  It is possible for one to easily double the power output when you connect it to another inverter generator by use of a parallel connection kit.  It comes with a 1.85 gallon tank which allows for this generator to run for 7 hours.

Fuel Levels

This WEN GN400i 4000-Watt Inverter just like other 4000 watt inverter generators in the market does not consume high amounts of fuel. In fact, it comes with an indicator light that helps inform one on when the generator needs more fuel or in case it has a charging issue.  This generator has noise levels of around 57 dBA making it more quiet and suitable for use in camp sites as most of the camping venues usually have noise regulations.

It is also possible to use this inverter generator in running of all the sensitive appliances since it produces less than 3% THD.  This generator has a control panel that comprises of two 120 V outlets.

Pros

  • It is quite affordable when compared to other inverter generators
  • A perfect generator for use on sensitive electronics
  • It is very quiet making it suitable for use in camping sites
  • Consumes less fuel

Cons

  • Comes with a small tank
  • Has a short run time

04. Champion 4000-Watt Open Frame DH Series Inverter

Salient Feature

  • Running watt: 3500
  • Starting watt: 4000
  • Engine(cc): 224cc
  • Voltage & Amp@RV: 120 30A
  • Voltage & Amp@Houshold: 120V 30A
  • Voltage & Amp@Locking: 120V 30A
  • Fuel Sources(Duel Fuel/gas): gasoline
  • Fuel Tank Capacity: 3.4 gal.
  • Fuel Consumption: 2.9 GPH
  • Sound/Noise Level(dBA): 64 dBA
  • Running Time@1/2 load: 17 hours
  • USB Port(DC-Supply): 
  • Weight: 93 pounds
  • Dimension: 18 x 10 x 15.5 inches
  • Warranty: 3 years

This Champion 4000-Watt Open Frame DH Series Inverter is another top 4000 watt inverter generator in the market.

Power Output

It comes with great power output levels of 3500 watts running power and 4000 watts starting power. Most of the people who have this generator are known to have lots of expectations from it.  The power output of this inverter generator is capable of powering a great number of large electronic appliances at home.

Body and Design

This inverter generator is specifically designed to have an open frame which makes it possible to work well with big engines.  It has a switch which is labeled engine on its control panel which is user friendly. This switch will get things started making it very easy to use. There is also an eco-switch that makes the generator able to run on economic mode where the consumption of fuel with drastically drops.

However, this Champion 4000-Watt Open Frame DH Series Inverter does not come with a handle and wheels which forces you to purchase the kits separately.  This inverter generator is also lightweight making it much easier to carry around the house.

Pros

  • Produces enough power to run large home appliances
  • Comes with an advanced inverter technology
  • Has an economic mode that can be used to save on fuel consumption
  • It is relatively lightweight

Cons

  • Lots of complain on its control issues
  • It is a bit noisier when compared to other inverter generators

05. Briggs & Stratton P4500 RV Ready Inverter Generator

Salient Feature

  • Running watt: 3700
  • Starting watt: 4500
  • Engine(cc): 224cc
  • Voltage & Amp@RV: 120 30A
  • Voltage & Amp@Houshold: 120V 20A
  • Voltage & Amp@Locking: 120V 30A
  • Fuel Sources(Duel Fuel/gas): gasoline
  • Fuel Tank Capacity: 3.5 gal.
  • Fuel Consumption: 0.22 GPH
  • Sound/Noise Level(dBA): 66 dBA
  • Running Time@1/2 load: 16 hours
  • USB Port(DC-Supply): 
  • Weight: 115 pounds
  • Dimension: 24.5 x 17.6 x 20.3 inches
  • Warranty: 3 years

This Briggs & Stratton P4500 RV Ready Inverter Generator is well designed using a quiet power technology that helps in offering its users with convenience wherever they are using it. It comes fully packed with top a feature that makes it be listed among the best 4000 watt inverter generators in the market.

Power Output

This Briggs & Stratton P4500 RV Ready Inverter Generator has a starting power of 4000 watts and a continuous power of 3700 watts. It is able to run for up to 16 hours when it is at 25% load with a single gas tank of 3.5 gallons full. This ensures its users have a maximum run time.

The built of this inverter generator gives it a very reliable power whenever there is a power outage or when going outdoors for recreational use.

Fuel Efficiency

This Briggs & Stratton P4500 RV Ready Inverter Generator is well designed with great features that make it stand out from the wide variety of inverter generators in the market. Some of its top features are the high power output, fuel efficiency and multi-functional display.  The main highlight of this generator is its Q4500 efficient motor. It will help in preserving fuel and reducing the level of noise when running.

Pros

  • Comes well equipped with a CO-Guard technology
  • Has a convenient display panel
  • Comes with variable outlets to help in different uses
  • Gives reliable power

Cons

  • The plastic housing is quite poor
  • Filling the oil is quite difficult

Click Here To See The Portable Inverter Generators Reviews

Is an inverter generator better? When to Choose an Inverter Generator?

Is An Inverter Generator Better

The inverters are known to make generator be more efficient. With the inverter, these generators will be in a position to adjust their speed engines automatically to ensure they match the application needs which they are being used for.  This inverter generator is only able to emit power that will be sufficient in running electrical appliances and devices.


The best time of choosing an inverter generator is before you travel for camping or before you start experiencing power outages. Don’t make purchase at last minute since lesser chances you will have enough time to purchase the right inverter generator.


Ensure the generator you choose is portable and compact that you can easily carry whenever you are traveling. Check how efficient it is with fuel use.

What is the advantage of an inverter generator? 

There are several benefits that come with having the inverter generators. In this section, we will be looking at some of the benefits you will enjoy when you invest in the best 4000 watt inverter generator in the market.

  • Portability

The inverter generator designs allow them to be very portable. They are mostly light in weight and do come with carrying handles while others have wheels to make them easy to move.  The inverter generators also tend to have smaller fuel tanks when compared to the conventional generators. This is one reason why they are more portable.

  • Fuel Efficiency

Fuel is quite expensive and the harsh economic times means that anyone interested in purchasing a generator will always go for one capable of preserving fuel.   When compared to the conventional generators, the inverter generators are more fuel efficient. This means that they will use less amount of fuel to perform the same task on same time when compared to the conventional power generators.  This explains why most of the inverter generators come with a lesser fuel tank.

  • Level of Noise

One thing you will enjoy when using the inverter generator is the amount of noise they produce. They do produce very less noise which makes them suitable for use at home. Majority of the inverter generators do produce noise levels that are not more than 60 Db. This makes them suitable for use in camping sites that have strict noise regulations.

  • Clean Electricity

The inverter generators are well known for producing clean electricity. This simply means that their frequency is very steady and does have a minimal THD or harmonic distortion.  The clean electricity this inverter generators produce is one of the reasons why most people consider using them for recreational purposes.   With the clean electricity, it is not a must that you connect the main supply using a transfer switch although there are certain appliances that can be connected directly.

The steady and clean electricity supply can easily be compared to what the suppliers of electricity using send through the main supply.  This ensures the inverter generators are very safe for sensitive appliance connections such as medical machines.

How to choose the best 4000 watt inverter generator?

The wide variety of 4000 watt inverter generators in the market has made it difficult for any interested buyer to identify which is best for him or her. However, there are a number of factors which you should consider to help you settle on a particular generator. Here are some of the important factors you need to consider when shopping for the best 4000 watt inverter generator.

  • Dual Fuel vs. Single Fuel

Most people who are in the market for the best 4000 watt inverter generator usually prefer going for the single fuel generators. However, the dual fuel inverter generators are known to be of great benefit in emergency situations.

In case one source of fuel gets short, it is possible for the other sources of fuel to have their generator still running.

  • Power Output

When in the market for a 4000 watt inverter generator, ensure that you check if it has a starting wattage that is quite high. For example a machine having 4500 watts as starting power and  has 4000 watts as the running power are suitable for use on appliances which are driven by motor.

  • Fuel Tank Runtime and Size

The generator runtime usually depends on the size of the fuel tank. Generator having a medium size fuel tank that can take 4.5 to 5 gallons is capable of giving one more runtime when compared to a generator having 3-4 gallons in tank size. However, the run time will also be determined by the source of fuel and the efficiency of fuel.  Investing in a generator that is fuel efficient will offer you a better run time when on a small tank.

  • Power Outlets

When shopping for a 4000 watt inverter generator, ensure that the power outlet is present on the generators’ control panel.  In case you will be in need of the USB port, ensure that the generator you are about to purchase comes with those ports.

When in the market of a generator capable of powering your RV appliances, then you have to check I the unit comes with an RV outlet. There are units which have up to two receptacles for household while others feature up to 4 power outlets.

  • Level of Noise

There are a good number of inverter generators in the market that produce less levels of noise.  When in the shop for an inverter generator, ensure you check on the amount of noise a generator produces.  Ensure the unit you settle for has a closed frame and that it comes with a muffler for reducing noise.

  • Safety Features

It is important that you also consider the safety features an inverter generator has before you purchase it.  It is advisable that you go for a low oil shutdown generator that can easily turn off the engine whenever it senses the levels of oil is not enough to effectively run the engine.  It is also recommended that you check if the generator has an overload protection that is capable of protecting the appliances and generator from any form of damage.

  • Warranty

Warranty is an important factor that you should never fail to consider when shopping for the best 4000 watt inverter generator.  Ensure the generator you settle for has a longer warranty period mostly 2-3 years period. This is a proof that the generator is made of quality materials.

Conclusion

We do hope that this best 4000 watt inverter generator review guide has been of great help to you. With in-depth product reviews together with factual data, pros and cons, we hope that you will be in a position of making an informed choice when in the market for an inverter generator.  Purchasing the right 4000 watt inverter generator will ensure you meet all your power requirements and you will have an easy time using it. You will also be in a position to power up your appliances and devices with lots of confidence.

FAQ's


  • What size generator do I need to run a 180 amp welder?

There are different sizes of generators in the market. A 180 amp welder will use a minimum of 8kva generator size while the most ideal size of generator that is suitable for a 180 amp welder is 10+ kva generators.

  • Does welding use a lot of electricity?

The amount of electricity a welding machine uses varied depending on the type of machine you use. To determine the amount of power a welding machine uses, you will have to divide the total power output using the efficiency of the power source that is offered by the machine used for welding to produce power input which is measured in KW.

  • What are the advantages of the inverter-type welding power source?

The inverter type welding power source machine are known to have lots of benefits. Some of its main benefit is that they are lightweight and compact which makes them portable and easy to maneuver around.  They also offer multi process welding and high quality welding capability to ensure the machine is capable of handling FCAW, TIG, MIG and Stick.  This generator also makes good use of the waveform control technology to ensure it offers a great arc variable control.

  • What size generator do I need to run a 240v welder?

It is never that easy to determine the right generator size that you will require to run a welding machine. However, for a 240 welder machine, it is highly recommended that you go for a generator with a minimum size not exceeding 7kva.

  • Can an inverter generator run a refrigerator?

Inverter is an electrical gadget that is capable of converting the DC power to 120V AC for household to enable it run appliances like refrigerator. However, the inverters are available in varying power capacities while some are in a position of operating a refrigerator. 

  • Can you run a welder off an inverter?

It is very possible to run a welder off an inverter. The 120V welders do have the capacity of running on an internal inverter. Using it will help in producing great stainless steel welds. There are some which are capable of doing aluminum

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