WEN DF400i
Generator. Specs from the manufacturer page (checked ).

The WEN DF400i is a dual-fuel inverter generator rated at 3200 running watts on gasoline (4000 surge watts) and 2900 running watts on propane (3200 surge watts). It includes 120V household receptacles, an RV-ready 120V NEMA TT-30R receptacle, a 12V DC receptacle, and a 5V USB port. The page gives a noise level of 58 dBA at quarter load and a three-year warranty.
Key features
- Dual fuel: gasoline gives 4000 surge / 3200 rated watts; propane gives 3200 surge / 2900 rated watts
- Auto Fuel Selection switches from propane to gasoline for longer run times
- EPA III 212cc engine rated 58 dBA at quarter load, 22 feet
- Fuel shutoff uses up the fuel remaining in the carburetor before shutdown
- Keyless electric start with a recoil pull starter as backup
- Outlets: two 3-prong 120V receptacles, one 120V 30A NEMA TT-30R RV-ready receptacle, one 12V DC receptacle, and 5V USB port(s) (the page gives both one and two)
- Total harmonic distortion under 0.3% at no load and under 1.2% at full load
- Low-oil and low-fuel automatic shutdown, overload protection, and an included spark arrestor
What it is for
- home backup
- RV
- camping
- tailgating
Specifications
| Running watts | 3200 W |
|---|---|
| Peak / surge | 4000 W |
| Fuel | dual-fuel |
| Tank | 8.33 L (2.2 gal) |
| Run time at 50 % load | 8.5 h |
| AC output voltage | 120V |
| Warranty | 3 years |
From the WEN page. Values the manufacturer does not publish are left out.
Similar inverter & portable generators
Anker SOLIX Smart Generator 5500
Pulsar GD400BN
Honda EU3200i
Champion 5500-Watt Dual Fuel Inverter
A-iPower AP3700i
EcoFlow Smart Generator (Dual Fuel)
GenMax GM3500iAED
WEN DF400i comparisons
- DF400i vs Generac iQ5200
- DF400i vs Anker SOLIX Smart Generator 5500
- DF400i vs Pulsar GD400BN
- DF400i vs Honda EU3200i
- DF400i vs Champion 5500-Watt Dual Fuel Inverter
Connection and wiring
Follow the diagrams in the WEN manual. Connecting to a home panel needs a transfer switch or interlock and a licensed electrician.
- Parallel connection, manual page 2 →
- Parallel connection, manual page 11 →
- Parallel connection, manual page 27 →
- Wiring diagram, manual page 41 →
Error codes and troubleshooting
We found no error-code table in this manual. Its troubleshooting section is the reference.
FAQ
How long does the WEN DF400i run on a tank?
The maker rates it at 8.5 hours at 50 % load (about 1,600 W) on a 2.2-gal tank. A light load such as a refrigerator and lights runs longer; a full load runs shorter.
Can the WEN DF400i start a sump pump or well pump?
Starting surge matters more than running watts: this unit is rated 4000 W peak. That covers a typical 1/2 HP sump pump (about 2150 W to start). Use the calculator with your exact pump.