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WEN GN400i - Spec Breakdown

The WEN GN400i is a compact and lightweight open frame inverter generator with a rated wattage of 3500 W and a starting wattage of 4000 W.

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This product has a newer version, the GN400iX, which has a CO sensor.
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Description

Remember when you had clean and quiet portable power? The WEN 4,000-Watt Inverter Generator provides clean energy, free of voltage spikes and drops, at approximately half the noise level of a standard generator. Our 212cc 4-stroke OHV engine produces up to 4000 surge watts and 3500 rated watts of power. Designed to mirror a pure sine wave, this generator limits total harmonic distortion to under 0.3 percent at no load and under 1.2 percent at full load, making it safe to run laptops, cellphones, monitors, tablets and other sensitive electronics. (source: WEN (opens in a new tab))

Zoom on the WEN GN400i

In summary, the WEN GN400i is a compact and lightweight portable inverter generator especially useful for:

  • RV travellers who wish to upgrade their experience to another level
  • People occasionally participating in sporting competitions, open-air performances and outdoor festivals
  • Handcrafting enthusiasts who wish to work on-the-go
  • Homeowners who want to be sure of their ability to power their fridges, cooking tools, heating and lighting equipment during power failures
  • Tailgating and campground aficionados with the desire of enjoying power anywhere they go

In the following paragraphs, we shall explore the power characteristics, available outlets, portability, and any additional features of the device, along with its emission compliance information.

Power & Run Time

The WEN GN400i in use

The WEN GN400i

The WEN GN400i is powered by a 212 cc OHV 4-stroke engine. It delivers 120V, runs on gasoline and offers a running wattage of 3500W as well as a peak wattage of 4000W. In addition, as it is parallel capable (WEN Parallel Connection Kit (opens in a new tab) not included), this power can be doubled when linked to another similar or compatible unit.

At a noise rating of 67 dBA (less noisy than a normal conversation), the inverter generator is started via a simple traditional pull-start mechanism.

Thanks to a fuel capacity of 1.85 gallon, the GN400i can operate for around 7 hours at 50% load with a full tank (fuel consumption around 0.26 GPH).

The GN400i produces a clean sine wave: thanks to a <1.2% Total Harmonic Disruption (THD), your sensitive electronics can be safely plugged in the AC outlets.

Outlets

The control panel features the following 3 AC outlets:

Duplex 120V 20A (5-20R)
120V 30A (TT-30R) receptacle

In addition, it provides 2 DC outlets: there's two 5V USB ports with which charging of electronics like mobile phones and tablets is made convenient.

This WEN generator is RV Ready, as it features a TT-30R receptacle (TT stands for 'Travel Trailer').

Portability

The design of the WEN GN400i is a typical, open frame, with the dimensions of L19.8 x W13.8 x H18.9 in, offering support and stability and enabling the possibility of raising it above ground level. The device has been designed for tough environments and demanding outdoor use.

With a dry weight of 66.1 lbs, the GN400i can easily follow you wherever your power needs are. Moreover, grabbing and moving this product is made even easier by its open frame design.

Features

Panel of the WEN GN400i

The GN400i's control panel

The light indicators show you if its oil levels are insufficient, the generator is on overload and the generator is ready.

Thanks to a built-in fuel gauge, the inverter generator allows you to quickly, conveniently and easily check the gas level at a glance.

The fuel shutoff feature turns off the flow of fuel, allowing for the GN400i to use up the remaining fuel from the carburetor before automatically shutting down. This helps fight the build-up and blockages caused by stagnant fuel inside of the carburetor, minimizing maintenance while prolonging the unit’s lifespan.

As for its security measures, the device features an overload protection (circuit breaker), an automatic low oil shut-off and a low fuel automatic shutdown, letting you use it with a peace of mind.

With the basic documentation and an owner's manual (opens in a new tab), letting you start the generator quickly, the WEN GN400i also comes with several accessories, including: oil, 2 altitude kits, tool kit and funnel.

Emissions

The WEN GN400i is EPA-approved and CARB-compliant. It can therefore be sold and purchased in all 50 states, including California.

Moreover, it features a spark arrestor, which makes it suitable for use in forested areas.

Product Videos

The WEN GN400i versus other generators

The following charts are provided to give you an idea of how some of the key specs of the WEN GN400i compare to generators of similar power (between 3000 and 4000 W).

  • In terms of its dry weight, the WEN GN400i stands at only 66.1 lbs, meaning that is one of the lighter devices of the 3000-4000 rated wattage category In terms of weight, one of the champions in their power range is the Genmax GM3300i, standing at just 47.4 lbs.
  • Because this inverter generator emits noise as low as 67 dBA, it can be considered to have a pretty average expected noise rating for a device of its power. If noise emissions are important to you, one of the least noisy generators of this power range is the Cat INV4000E with only 51 dBA.
  • As far as autonomy is concerned, providing around 7 hours of runtime with a full tank at a 50% load, the GN400i falls into the low end in comparison with other devices of a comparable power output. If you consider autonomy on a single full tank as one of the deciding factors, one of the generators in the same power range that offers the highest run time is the Predator 4375, with around 16 hours.
  • Run times are important, yet thanks to their dependence on the fuel capacity, they should be judged along with the fuel consumption of the device. This inverter generator, with an estimated fuel consumption of just 0.26 GPH (gallon per hour) at 50% load, is one of the more fuel efficient generators, for the previously mentioned wattage range. If you wish to acquire one of the most gasoline efficient products of this power range, the Westinghouse iGen4200, with a fuel consumption of 0.17 GPH could be in your good books.

Here's a list of the most popular specific comparisons:

Price comparison

As you can see from this interactive chart, when compared to other 3000-4000W generators, the WEN GN400i is on the cheap side of the price range.

It can therefore be a really good buy if you're looking to acquire a budget generator.

The bottom line

STRENGTHS:
  • Inexpensive
  • Several accessories included
  • RV Ready
  • Parallel capable
  • Inverter
  • Lightweight (66.1 lbs)
  • Fuel efficient
AVERAGE SPECS:
  • Acceptable noise (67 dBA)
WEAKNESSES:
  • No data center
  • No electric start
  • Relatively low run time

Do you own the WEN GN400i and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

Features and Specifications

General
InverterYes
PortableYes
Parallel capableYes, cable not included
RV readyYes
FuelGasoline
Engine212 cc OHV 4-stroke
Starting systemRecoil
Power
VoltageAC: 120V 60 Hz, DC: 5V
Running watts3500 W
Starting watts4000 W
Running amps29.2 amps
Peak amps33.3 amps
Run time @50% load7 h
Run time @25% loadUnknown
Features
GFCI outletsNo
Covered outletsNo
Automatic Voltage RegulationInverter
AC outlets
  • 1x Duplex 120V 20A (5-20R)
  • 1x 120V 30A (TT-30R)
DC outlets2x 5V USB port
Data centerNo
IndicatorsLow oil, overload and output ready
Fuel tankSteel, 1.85 gal
Fuel gaugeYes
Misc
Weight66.1 lbs
Approx. dimensions (L x W x H)19.8 x 13.8 x 18.9 in
Noise (lower limit)67 dBA
THD< 1.2%
ComplianceCARB, EPA
SecurityLow oil, overload and low fuel protection
Spark arrestorYes
NeutralFloating
Accessories includedOil, funnel, tool kit, and 2 altitude kits
Warranty2 years
UPC044459991694

Unlike many websites, we did our best to research each of the specs above. That being said, we are not immune to making the occasional mistake or omission. Should you notice any missing or incorrect values, don't hesitate to suggest improvements so we can address the issue.

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About WEN

WEN Products, founded by Nick Anton in 1951, is an American power tool manufacturer and distributor, which claims to have a part in the development of modern chainsaw, soldering devices and wet sharpeners, through its research in random orbital technology. The Illinois based company expanded its distribution network to include various power tools, such as presses, drills and of course, power generators. As a distributor, WEN’s portfolio largely consists of branded products of different manufacturers, imported from Asia.

Warranty Information

The WEN GN400i is covered under a warranty for up to 2 years. This warranty may be limited and may not cover all parts of the generator.
For more information about the warranty of WEN generators, please consult WEN's warranty policies (opens in a new tab). Alternatively, you can also contact their Customer Support: 1-847-429-9263.

Questions & Answers

What can it power?
Examples of items that can be simultaneously powered.
The examples below are based on a maximum load of 80% and estimated wattages. For a more accurate estimation, use our generator size calculator.
ItemRunning WattsStarting Watts
At homeMicrowave (1000 watts)15001500
Refrigerator (energy star)1921192
Vacuum cleaner10751175
Cell phone charger2020
Total2787 W3787 W
For campingRV AC (11,000 BTU)10101600
RV refrigerator180600
Microwave (1000 watts)15001500
Radio100100
Total2790 W3380 W
For workGrinder14002500
Demolition hammer12601260
Bug zapper8080
Total2740 W3840 W
Does this model have a fuel shutoff? (Asked February 26, 2020)

This model has a manual fuel shutoff. There's a valve that you can turn to the OFF position in order to let the generator run until the fuel is used up.

Does the Wen 400i has electric start? (Asked September 07, 2020)

The unit is recoil start only.

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