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WEN GN400i - 3500/4000W Open Frame Inverter Generator

The WEN GN400i is a compact and lightweight open frame inverter generator with a rated wattage of 3,500 W and a starting wattage of 4,000 W. (Read full specs)

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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 looking for even more independence
  • Occasional participants of outdoor events, competitions, concerts and festivals
  • DIYers who wish to improve their efficiency with tools
  • Homeowners who want to be sure of their ability to power their fridges, cooking tools, heating and lighting equipment during power failures
  • Camping and tailgating buffs looking to enhance their experience

In the forthcoming sections, you'll delve into its power characteristics, the various outlets it offers, its overall portability, and the additional features it boasts.

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 3,500W as well as a peak wattage of 4,000W. Furthermore, its parallel capability (WEN Parallel Connection Kit (opens in a new tab) not included) allows power output to increase when connected to another similar or compatible unit, ensuring expanded energy capacity and reliability for various applications.

Operating with a noise level of 67 dBA (less noisy than background music), the inverter generator starts up via a conventional pull-start mechanism.

The GN400i's fuel tank holds 1.85 gallon, ensuring uninterrupted operation for around 7 hours at 50% load with a full tank (fuel consumption approximately 0.26 GPH).

As the GN400i produces a clean sine wave, with a <1.2% Total Harmonic Distortion (THD), sensitive electronics may be plugged in the AC outlets safely.

Outlets

The control panel features 3 AC outlets as follows:

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.

With its TT-30R receptacle (TT as in 'Travel Trailer'), this WEN generator is RV Ready.

Portability

At L19.8 x W13.8 x H18.9 in, the standard open frame design of the WEN GN400i delivers stability alongside easy maintenance access to components and good air cooling. This type of design is ideal for tough environments and heavy outdoor use.

With a dry weight of 66.1 lbs, the GN400i is manageable, ensuring it can accompany you wherever you need power. Moreover, its open frame design makes it incredibly easy to grasp the frame in order to change its location.

Features

Panel of the WEN GN400i

The GN400i's control panel

When its oil levels are insufficient, the generator is overloaded and the generator is ready, you will be informed by the featured light indicators.

With its built-in fuel gauge, the inverter generator provides quick and convenient gas level checks.

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 the carburetor, minimizing maintenance while prolonging the unit’s lifespan.

In terms of security, the generator features an overload protection (circuit breaker), an automatic low oil shut-off and a low fuel automatic shutdown, ensuring peace of mind during its use.

Beyond the standard documentation and an owner's manual (opens in a new tab) to assist with setup, the WEN GN400i ships with supplementary accessories: funnel, 2 altitude kits, tool kit and oil. An official storage cover is also available, as a separate purchase.

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 inverter 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 inverters of the 3000-4000 rated wattage category if you wish to prioritize weight, the Pulsar PGD40iSCO is one of the top contenders in its power category, weighing only 46 pounds.
  • When stacked up against other devices of similar running wattage, this inverter generator's lowest possible noise rating of 67 dBA places it in the louder category. For those who are looking for a less noisy device, we suggest the Westinghouse iGen4500DF. With just 52 dBA, it is one of the most quiet devices in this power range.
  • As for its runtime, the GN400i runs for around 7 hours at a 50% load, placing it towards the low end among comparable inverters. For those prioritizing autonomy, the Westinghouse iGen4500DF could be considered, as it offers one of the longest run times among generators with similar power output, reaching around 15 hours.
  • Autonomy holds its importance, however, it is largely dependent on the generator’s fuel capacity and so, it is nonsensible to discuss it without mentioning fuel efficiency as well. Among generators of similar power, this inverter generator stands out with a better fuel efficiency than most, with consumption rates around 0.26 GPH (gallon per hour) at 50% load. If gasoline efficiency is at the top of your list, you may want to have a look at the Pulsar PGD40iSCO, which has great fuel efficiency, with a gas consumption of only 0.22 gallons per hour.

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

Price comparison

As you can see from these interactive charts, when compared to other 3000-4000W inverter 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
WEAKNESSES:
  • No data center
  • No electric start
  • On the noisy side (67 dBA)
  • 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
Parallel capableYes, cable not included
RV readyYes
FuelGasoline
Engine212 cc OHV 4-stroke
Starting systemRecoil
Warranty2 years
Power
VoltageAC: 120V 60 Hz, DC: 5V
Running watts3,500 W
Starting watts4,000 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
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 sizing calculator.
ItemRunning WattsStarting Watts
At homeDish washer15003000
Refrigerator (energy star)1921192
Toaster oven800800
Total2492 W3992 W
For campingRV AC (11,000 BTU)10101600
RV refrigerator180600
Electric fry pan15001500
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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