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WEN · Inverter generator · Model GN400i

GN400i

GN400i RV-Ready 4000-Watt Open Frame Inverter Generator

3,500W running4,000W startingGasolineEngine displacement not listed in the catalog description
Check price at WEN Sale observed $479.99
WEN GN400i RV-Ready 4000-Watt Open Frame Inverter Generator
Official product image · WEN Products

Infographic gallery

Output, fuel flexibility, runtime, and ownership.

01 · Output by fuel

4,000W maximum starting output

Gasoline3,500W / 4,000W

Bars compare WEN's published running and starting capacity for each fuel configuration.

02 · Fuel & runtime

Gasoline

Model-specific energy system and manufacturer-published operating information.

Capacity

Our ultra-efficient 1.85-gallon tank provides over 7 hours of half-load run time.

Published runtime

Our ultra-efficient 1.85-gallon tank provides over 7 hours of half-load run time.

03 · Portability & price

76.6 lb (official listing weight)

Official listing weight

WEN price
$479.99
Availability
Available from WEN
Model
GN400i
04 · Controls & protection

Starting

Recoil start

Voltage

120V

Fuel shutoff

Not listed

CO shutdown

Not listed

Official product gallery

Product views and WEN feature graphics.

This gallery uses the current official image set published for model GN400i.

GN400i official WEN product image 1
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GN400i official WEN product image 2
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GN400i official WEN product image 3
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GN400i official WEN product image 4
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GN400i official WEN product image 5
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Complete specifications

The fields that matter for comparison.

Output, engine, fuel, runtime, outlet, sound, weight, safety, price, and warranty details come from WEN's current official collection, model description, product imagery, and manual link.

Combustion generators are for outdoor use only. Keep the generator at least 20 feet from occupied buildings with exhaust directed away from doors, windows, and vents.

Product overview

Generate clean power to safely operate sensitive electronics such as phones, tablets, televisions and computers.

Electrical output by fuel

Gasoline output
3,500W running / 4,000W starting
Voltage
120V
Outlet panel
Includes two 120V NEMA 5-20R receptacles, two 5V USB ports, one 120V RV-ready TT-30R receptacle, and a two-year warranty.
Power quality
Generate clean power to safely operate sensitive electronics such as phones, tablets, televisions and computers.
Parallel capability
Published as parallel capable; compatible kit sold separately

Engine, fuel & runtime

Engine or power system
Engine displacement not listed in the catalog description
Starting system
Recoil start
Fuel options
Gasoline
Fuel capacity
Our ultra-efficient 1.85-gallon tank provides over 7 hours of half-load run time.
Published runtime
Our ultra-efficient 1.85-gallon tank provides over 7 hours of half-load run time.
Published sound information
WEN describes this model as quiet; see the official page for test conditions
Fuel shutoff
Not listed for this model

Portability, protection & ownership

Listing weight
76.6 lb (official listing weight)
Carbon-monoxide shutdown
Not listed for this model
Low-oil shutdown
Yes — published by WEN
Warranty
Includes two 120V NEMA 5-20R receptacles, two 5V USB ports, one 120V RV-ready TT-30R receptacle, and a two-year warranty.
Price and availability
Current WEN price: $479.99
Official model
GN400i

Official feature details

Published WEN feature

Generate clean power to safely operate sensitive electronics such as phones, tablets, televisions and computers

Output and operation

Parallel-ready panel allows you to connect any two WEN inverter generators for increased wattage output

Controls and convenience

212cc 4-stroke OHV engine produces 4000 surge watts and 3500 rated watts

Power-panel capability

Lightweight body weighs 30% less than a standard 4000-watt generator

Protection and ownership

Includes two 120V NEMA 5-20R receptacles, two 5V USB ports, one 120V RV-ready TT-30R receptacle, and a two-year warranty

Best-fit uses

  • RV and camping
  • Refrigerators and household essentials
  • Jobsite tools
  • Storm preparation

Standout features

  • 4,000W starting / 3,500W running
  • Gasoline
  • Recoil start
  • Low-oil automatic shutdown

Match it to the equipment you'll actually run.

Use the independent wattage calculator before buying.

Check my power plan
Sources: WEN GN400iAll WEN generatorsOfficial manualVerified September 15, 2026

Ownership resources

Accessories, manuals, and documents.

Start with the exact WEN GN400i model or item number. Accessory families can look alike while using different connectors, electrical limits, engines, or mounting points.

Compatible accessories

Match by model and connection.

Verify exact fit

Generator power cord or inlet connection

Use a correctly rated cord or professionally selected inlet connection for the intended load.

Match voltage, amperage, blade pattern, and wire rating to TT-30R. Home connections require approved transfer equipment and qualified installation.
View official accessory options
Verify exact fit

Parallel kit

This model’s published information references parallel operation. Use the manufacturer’s matching kit and pairing rules.

Confirm that the kit explicitly names GN400i or its exact generator family before connecting another unit.
View official accessory options
Verify exact fit

Maintenance kit and service parts

Model-matched filters, spark plugs, batteries, oil supplies, and service parts support scheduled maintenance.

Match the complete GN400i model or item number and follow the maintenance table in its manual.
View official accessory options
Verify exact fit

Storage cover or approved running shelter

A fitted storage cover protects a cooled, stored generator. A running shelter must be designed for generator operation.

Never run a fuel-burning generator indoors or inside a storage cover. Follow the manual’s clearance and ventilation requirements.
View official accessory options

Manuals & PDFs

Official product materials.

Owner’s or operator’s manualPDFOperating, safety, maintenance, and troubleshooting instructions for GN400i.Official product pageProduct pageCurrent manufacturer overview, notices, specifications, downloads, and support links.

Compatibility note: Links lead to manufacturer or official retailer resources. Confirm the full model or item number, connector type, voltage, amperage, and published compatibility list before buying. Installation involving a home panel, inlet, transfer switch, or fuel plumbing should be handled as required by local code.