WEN DF400i - 3200/4000W Dual Fuel Inverter Generator With Electric Start

The WEN DF400i is a quiet and compact dual fuel inverter generator with a rated wattage of 3,200 W and a starting wattage of 4,000 W. (Read full specs)

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Description

Zoom on the WEN DF400i

In a nutshell, the WEN DF400i is a quiet and compact portable inverter generator mostly geared towards:

  • RV travellers who wish to upgrade their experience to another level
  • Occasional participants of outdoor events, competitions, concerts and festivals
  • Amateur DIY lovers
  • Homeowners in need of an emergency backup power for their essentials
  • Camping and tailgating hobbyists looking for a portable power source

The following sections will present you in detail its power characteristics, the different outlets it offers, its overall portability, the extra features it benefits from, and any relevant emission compliance details.

Power & Run Time

The dual-fuel technology of the WEN DF400i allows for an output of 120V and provides superb power and versatility. If gasoline-powered, the device provides a running wattage of 3,200W and a starting wattage of 4,000W. If propane-powered, it gives 2,900 rated watts and 3,200 starting watts. In addition, as it is parallel capable (parallel kit not included), this power can be increased when linked to another similar or compatible unit.

WEN’s Auto Fuel Selection technology automatically selects the fuel source (LPG or gasoline) depending on availability and prioritizes LPG. Thus, if a propane tank with enough LPG is connected, the generator will automatically use LPG. If no propane tank is connected, or if there is not enough LPG remaining in the tank, the generator will use gasoline.

The inverter generator features a simple traditional pull-start mechanism and also a convenient and easy-to-use electric starter (battery included). It is rated for a noise of 58 dBA (less noisy than a conversation at home).

With a fuel capacity of 2.2 gallons, the DF400i can operate for around 8.5 hours at 50% load using gasoline (fuel consumption around 0.26 GPH), or for around 9 hours (on a 20 lbs tank - propane consumption around 0.52 GPH) using propane.

As the DF400i 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 the upcoming 3 AC outlets:

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

Additionally, it features 3 DC outlets: there's two 5V USB ports with which charging of electronics like mobile phones and tablets is made convenient and a 12V 8A (cigarette lighter style) receptacle allowing you to easily charge your batteries.

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

Portability

Since the WEN DF400i is an inverter generator, its closed design (L23.2 x W18 x H20.1 in) has an esthetical advantage over conventional, open frame devices. This type of design is the most modern and convenient way to recreationally generate power.

As the generator's weight is 100 pounds, manually moving it or transporting it may be challenging, despite the fact that it is technically considered 'portable' (movable). Nevertheless, it can still be moved quite conveniently with the help of its set of 2 wheels and its folding handle, once it is placed on the ground.

Features

Panel of the WEN DF400i

The DF400i's control panel

The control panel of the DF400i includes a digital data center, which assists you in monitoring its status and activity, as it provides information on the frequency, voltage, fuel level, lifetime run hours and power output.

In addition to this info, several light indicators serve to show you when the generator is overloaded, the generator is ready and the oil level is too low.

The fuel shutoff feature turns off the flow of fuel, allowing for the DF400i 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.

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

Besides the classic documentation and an owner's manual (opens in a new tab) to get you promptly started, the WEN DF400i also comes with some accessories: tool kit, funnel and propane hose are included. An official storage cover is also available, as a separate purchase.

Emissions

The WEN DF400i is EPA-approved and CARB-compliant. Thus, selling and purchasing this generator is allowed in each of the 50 states, including California.

Moreover, it features a spark arrestor, making it usable in forested areas.

Product Videos

The WEN DF400i versus other generators

The following charts are provided to give you an idea of how some of the key specs of the WEN DF400i compare to inverter generators of similar power (between 2500 and 3500 W).

  • As its weight is 100 pounds, the WEN DF400i falls in the expected weight range of the inverters in the 2500-3500 rated wattage category. Regarding dry weight, one of the champions in the same power range is the Pulsar PGD40iSCO, with a dry weight of only 46 lbs.
  • With a lowest possible noise of 58 dBA, this inverter generator places itself amongst the more quiet of the products delivering similar power. If noise emissions are important to you, one of the least noisy generators of this power range is the Honda EU3000iS with only 50 dBA.
  • As the DF400i offers around 8.5 hours run time on a full tank at a 50% load, it falls within the average autonomy range among the inverter generators of a similar power. Furthermore, considering the run times, one of the generators which have a roughly same power output, with the highest autonomy, is the Ryobi RYi4022X, as it provides around 12 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 is one of the more fuel efficient models of the aforementioned output range, as its estimated fuel consumption reaches just 0.26 GPH (gallon per hour) at 50% load. If you are concerned with gasoline efficiency, having a fuel consumption of just 0.22 GPH, the Pulsar PGD40iSCO is a device you could look out for.

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

The bottom line

STRENGTHS:
  • Dual Fuel
  • Several accessories included
  • RV Ready
  • Electric start
  • Parallel capable
  • Auto Fuel Selection technology
  • Inverter
  • Quiet for its power (58 dBA)
  • Fuel efficient
AVERAGE SPECS:
  • Decent weight (100 lbs)
  • Decent run time
WEAKNESSES:
  • No remote start

Do you own the WEN DF400i 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
FuelDual Fuel (gasoline/propane)
Engine212 cc OHV 4-stroke
Starting systemRecoil, Electric
Warranty2 years
VoltageAC: 120V 60 Hz, DC: 12V
Power
GasolinePropane
Running watts3,200 W2,900 W
Starting watts4,000 W3,200 W
Running amps26.7 amps24.2 amps
Peak amps33.3 amps26.7 amps
Run time @50% load8.5 h9 h
Run time @25% loadUnknownUnknown
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
1x 12V 8A (cigarette lighter style)
Data centerPower output, fuel level, lifetime run hours, voltage and frequency
IndicatorsLow oil, overload and output ready
Fuel tank2.2 gal
Fuel gaugeDigital
Misc
Weight100 lbs
Approx. dimensions (L x W x H)23.2 x 18 x 20.1 in
Noise (lower limit)58 dBA
THD< 1.2%
ComplianceCARB, EPA
SecurityLow oil and overload protection
Spark arrestorYes
Accessories includedFunnel, tool kit, propane hose, and battery
UPC044459004004

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 DF400i 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 homeAC (10,000 BTU)15002200
Refrigerator (energy star)1921192
Freezer8101750
Set of 5 LED light bulbs5555
Total2557 W3557 W
For campingRV AC (11,000 BTU)10101600
RV refrigerator180600
Radiant heater13001300
Set of 5 LED light bulbs5555
Total2545 W3135 W
For workGrinder14002500
Belt sander11502400
Total2550 W3800 W

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