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WEN

WEN RV-Ready 4000-Watt Open Frame Inverter Generator (GN400iM)

  • Based on 21 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Friday, Feb 6
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Style: 4000W, Inverter


Features

  • Generates clean power to safely operate sensitive electronics such as phones, tablets, TVs, and computers
  • Parallel-ready panel allows you to connect any 2 WEN inverter generators for increased wattage output
  • 212cc 4-stroke engine produces 4,000 surge watts and 3,500 rated watts
  • Lightweight body weighs 30% less than a standard 4000-watt generator
  • Includes two 120V NEMA 5-20R receptacles, two 5V USB ports, one 120V RV-ready TT-30R receptacle, and a two-year warranty

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 for safe use with laptops, phones, and other sensitive electronics. 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 sensitive electronics. Our ultra-efficient 1.85-gallon tank provides over seven hours of half-load run time. Maximize fuel economy by engaging the eco-mode switch. This allows the generator's engine to automatically adjust its fuel consumption as items are plugged into and unplugged from the panel, preventing the unnecessary usage of gasoline. Need more energy? Easily link up two generators using a WEN® Parallel Connection Kit (sold separately) in order to share wattage amongst multiple units. Low- oil and low-fuel automatic shutdown combine with the built-in overload protection and indicator lights to safeguard both your generator and your electronics from damage. And because it's a WEN® product, your open frame inverter generator comes backed by a two-year warranty, a nationwide network of skilled service technicians, and a friendly customer help line, all to make sure you remember WEN®.

Brand: WEN


Wattage: 4000 watts


Fuel Type: Gasoline


Power Source: Fuel Powered


Recommended Uses For Product: Camping, Residential


Voltage: 120 Volts (AC)


Output Wattage: 4000


Special Feature: Lightweight


Included Components: Two 120V NEMA 5-20R receptacles, two 5V USB ports, one 120V RV-ready TT-30R receptacle, and a two-year warranty See more


Color: Orange


Brand: WEN


Wattage: 4000 watts


Fuel Type: Gasoline


Power Source: Fuel Powered


Recommended Uses For Product: Camping, Residential


Voltage: 120 Volts (AC)


Output Wattage: 4000


Special Feature: Lightweight


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


Color: Orange


Product Dimensions: 19.8"L x 13.8"W x 18.9"H


Material: Metal


Model Name: WEN RV-Ready 4000-Watt Open Frame Inverter Generator


Engine Type: 4 Stroke


Ignition System Type: recoil start


Tank Volume: 1.9 Imperial Gallons


Total Power Outlets: 5


Starting Wattage: 4000 Watts


Running Wattage: 4000 Watts


UPC: 044459140016


Manufacturer: WEN


Item Weight: 73.3 pounds


Item model number: GN400iM


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Feb 6

This item is non-returnable:

Non-returnable. Transportation of this item is subject to hazardous materials regulation

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Good investment!
Style: 5600W, Electric Start
Review Image by Phil K. Phil K.
A little workhorse. Have had it about week and it has performed great. Able to run a demolition hammer and a shop vac at the same time. After watching the delivery person not be so careful with which end is up decided to remove the shipping plate and let set overnight. Simple direction. Added premium gas and it started right up. Blue smoke for a bit as it first ran but that went away. Runs at about 82db. Electric start is a major benefit!! Only issue was the drain screw on the fuel cup needed to be tightened. So far a great unit at a great price! ... show more
Reviewed in the United States on November 19, 2025 by Phil K. Phil K.
    • Great Little generator
Style: 5600W, Dual Fuel, Electric Start
Assembly was a snap, starts right up on gas or lp, I prefer lp as I am a little isolated. Did the break in like the manual said, had it two weeks and lost power for two days, ran great , kept the furnace fan going and tv Xbox and lights, quiet quieter than my vacuum, yes I tested it, can't give accurate decibel but very quiet for a generator, I definitely would recommend. ... show more
Reviewed in the United States on January 2, 2026 by E. David Beda
    • Affordable and Reliable Power!!!
Style: 4000W, Inverter
The media could not be loaded. I purchased this generator specifically for emergency situations and it's exceeded my expectations. My goal was to find something affordable yet powerful enough to run two electric heaters in the winter or a portable A/C unit in the summer—and still have juice left for essentials like a lamp, phone chargers, and our modem/router. This unit handles all of that with ease. It may not have the extra bells and whistles found in higher-end inverter models, but I didn’t need those. What I wanted was reliability and simplicity, and this generator delivers. It starts with one pull and hums along at a reasonable volume (around 50 decibels from 25 feet away), which is perfectly in line with similar units. One standout feature is the eco mode, which adjusts the engine speed based on the power demand—saving fuel and reducing noise when the load is light. I also really appreciate the open-frame design—it makes it super easy to drain the carburetor after use, a huge convenience. Unlike some models, this generator doesn't have a carbon monoxide shutdown sensor. Personally, I prefer it that way. I’m very aware of the safety rules when operating a generator and never run it indoors or in confined spaces. Without the auto-shutdown, I don’t have to worry about wind triggering unnecessary shut-offs. It is a bit heavier than I anticipated, so I picked up a folding hand truck and now it's fully mobile—problem solved. It comes with a standard two-year manufacturer warranty, and I opted for the extended protection plan, giving me four years of peace of mind. Overall, I’m extremely satisfied with this purchase. It gives me confidence that we'll have power in any situation. ... show more
Reviewed in the United States on July 21, 2025 by Secret Agent Shopper
    • Overall well built but has a few drawbacks to me
Style: 5600W, Electric Start
Overall it's a good generator. There's a few nueance things that are a little frustrating with it but not deal breaking or things you can't work around. It was easy to assemble and the instructions are generally easy to understand if your mechanically inclined. It's easy to put the handles on the wrong sides or forget to put the loops on for the pins. But again easy to fix that with the handles being 1 bolt and a pin. I have the electric ignition one (it was somehow listed at the same price as the pull start only) and it has the pull start as a backup. I haven't used the pull start so I can't say how well that works as of yet. The ignition works like a dream. The only downside to me, and again this is strictly personal preference, is it's a rocker switch. I would personally like a push button. But it starts almost immediately as soon as you rock the switch down. There were 2 things that kept me from making this a 5 star review of the generator. The 1st being the fine threads on the oil dipstick no matter what, wants to try and cross thread or go in offset. And if it does DO NOT, and I can't stress this enough, keep trying to tighten it. It's a plastic dipstick, it will cross thread easily. Instead keep struggling to find it's perfect spot and it will line up. There's no way to see if there is any lines to line up unless your laying on the ground or floor of your shop. The only other option is to have someone else help you lift it onto a table. The 2nd thing is that holding the rocker switch to off on the panel will not shut it off. Instead you have to grab the rpm handles below that and pull it all the way to the left or reach around and turn the gas off. I'm assuming the off on the rocker panel is for the power out of the outlets. Which should have a switch obviously. But it should have an off switch to turn the motor itself off outside of using the shutoff or rpm control. The fail safes do appear to work. Running it full blast with just a battery charger will make it shut off with a fault, as it should since it's sending a ton of power into 1 outlet. The noise level isn't terrible, I've heard way louder generators in my time. If I had to compare it to anything it's around the same level as a push gas lawn mower. Maybe a few db lower than a mower. So if your just starting it up and leaving it run while your not near it then you'll be fine. If your on a job site working near it most of the time I would suggest ear protection just because of the prolonged sound. ... show more
Reviewed in the United States on May 18, 2025 by David Sheller

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