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WENModel GN625i

WEN 5,000W Gas Generator Review

The WEN GN625i is a 6250-watt RV and transfer-switch-ready open frame inverter generator, featuring a 301cc 4-stroke OHV engine that produces 6250 surge watts and 5000 rated watts. It generates clean power suitable for sensitive electronics and offers a lightweight design, weighing 30% less than traditional generators of similar capacity.

At a Glance

  • Running Watts
    5000W
  • Starting Watts
    6250W
  • Fuel Type
    Gasoline
  • Runtime (50%)
    8.1h
  • Weight
    119.5 lbs

Where to buy

Prices can change. We update these automatically.

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    Is this the right generator for you?

    Here's the quick tradeoff view — what this model does well, and where it may not fit.

    Pros

    • 301cc 4-stroke OHV engine producing 6250 surge watts and 5000 rated watts
    • Clean power output suitable for sensitive electronics
    • Lightweight design, 30% lighter than traditional 6250-watt generators
    • 4.2-gallon gas tank providing up to 8.1 hours of half-load run time
    • Multiple outlets: four 120V NEMA 5-20R receptacles, two 5V USB ports, one 120V/240V NEMA L14-30R twist lock receptacle, and one 120V RV-ready TT-30R receptacle

    Cons

    • Heavy weight at 119.5 pounds
    • No electric start feature
    Best use cases
    Sensitive electronicsRV / campingHome backup

    Summary

    The WEN GN625i is a gasoline generator rated for 5000 running watts with 6250 starting watts. That combination targets situations where steady output matters day to day, while still leaving extra headroom for equipment that needs a stronger surge to get moving.

    Because it is gasoline-powered, the GN625i fits workflows where gas is the chosen fuel on hand, and its wattage figures set clear expectations for both continuous loads and startup demands.

    Power & Runtime

    With 5000 running watts and 6250 starting watts, the GN625i is built to handle sustained power needs while also accommodating higher initial draw when certain devices first switch on. In practical use, that starting-watt cushion helps reduce the chance of bogging down when a load kicks in, while the running-watt rating defines what it can support continuously.

    Runtime is listed at 8.1 hours at 50 percent load, paired with a 4.2 gallon fuel tank, which frames how long you can plan to operate before refueling when you are not pushing the generator to full output. Power quality is also a key part of the story here, with 1.5 percent THD and an inverter design, a combination that aligns with cleaner output for electronics that benefit from tighter waveform control.

    Portability

    At 119.5 lbs, the GN625i is a substantial unit, and its physical footprint of 27 x 25 x 24 inches gives a concrete sense of the space it will occupy in storage or during use. Those dimensions help when planning where it will sit in a garage, cargo area, or campsite setup, while the weight sets expectations for how deliberate you will want to be about moving it into position.

    Features

    Starting is handled through a recoil system, keeping operation straightforward and fully manual. Day-to-day monitoring is supported by a fuel gauge and indicators, which makes it easier to track fuel status and basic operating conditions at a glance while the generator is running.

    For use-case flexibility, the GN625i is RV ready, and it also includes a spark arrestor, which is a practical add for environments where spark control is part of the operating requirements. Covered outlets add a layer of protection for the receptacles, and AVR, or automatic voltage regulation, helps manage output stability as loads change. Compliance is listed as EPA, and the generator is backed by a 2-year warranty, giving a defined window of coverage.

    Recommended Audiences

    • RV owners needing RV-ready power
    • Owners of sensitive electronics seeking clean inverter power
    • Shoppers who prefer gasoline-powered generators
    • Homeowners needing emergency backup for essential circuits
    • Noise-sensitive users or those in campground environments
    Updated: Feb 24, 2026

    Score Breakdown

    5.1
    / 10
    Rank #31 of 66 in Inverter (5,000W+)
    Value (25%)
    Quality (25%)
    Practical (18%)
    Features (12%)
    Features (1.0 pts)
    • Inverter+1
    Percentile Rankings (within peer group)
    • Watts/$
    • Surge/$
    • Runtime/$
    • Warranty
    • THD (lower=better)
    • Build Quality
    • Noise (lower=better)
    • Portability
    • Outlet Variety
    • Feature Points

    What this generator can power

    At a Glance

    • Continuous:5,000W(recommended usable: 4,000W)
    • Surge:6,250W
    • Output:120/240V
    • Inverter:Yes (clean power for electronics)

    Big-item compatibility

    Refrigerator
    Yes
    Sump Pump (1/3 HP)
    Yes
    Well Pump (1 HP, 240V)
    Yes
    Furnace Blower
    Yes
    Central AC (3 Ton, 240V)
    Maybe

    May struggle with startup surge

    Window AC (10,000 BTU)
    Yes
    Electric Water Heater (240V)
    No

    Exceeds capacity

    Electric Range/Oven (240V)
    No

    Exceeds capacity

    Air Compressor (1 HP)
    Yes

    Example setups

    Essentials

    • Lights + Wi-Fi + Charging
    • Refrigerator
    • Furnace Blower
    • Sump Pump (1/3 HP)

    Est. running: 1,800W

    Peak surge (single motor): 2,000W

    Avoid starting multiple motor loads at the same time.

    Essentials + Comfort

    • Lights + Wi-Fi + Charging
    • Refrigerator
    • TV + Entertainment System
    • Microwave
    • Window AC (10,000 BTU)
    • Furnace Blower

    Est. running: 3,500W

    Peak surge (single motor): 2,000W

    Avoid starting multiple motor loads at the same time.

    Jobsite / Tools

    • Lights + Wi-Fi + Charging
    • Circular Saw (7 1/4")
    • Air Compressor (1 HP)

    Est. running: 3,100W

    Peak surge (single motor): 4,500W

    Avoid starting multiple motor loads at the same time.

    These are estimates using typical wattage assumptions. Real appliances vary. Startup surges can be 2–6× the running wattage for motor-driven loads. 240V loads require a 120/240V generator and proper connection. Use a transfer switch or interlock kit; never backfeed a panel.

    WEN
    ReliabilityCAverage

    About WEN

    WEN is renowned for delivering affordable, reliable generators and power equipment, catering to various residential and industrial needs.

    Founded1951
    HQElgin, Illinois, USA
    Website (opens in a new tab)
    Support1-847-429-9263
    Support / Manuals (opens in a new tab)
    View all WEN generators

    Warranty

    Coverage: 2 years

    Power by fuel

    FuelRunningStartingRuntime @50%Runtime @25%
    Gasoline5000W6250W8.1h

    Full Specifications

    Power

    Running Watts5,000 watts
    Starting Watts6,250 watts
    Starting Watts (Gasoline)6,250 W
    Running Watts (Gasoline)5,000 W

    Engine

    Engine301 cc OHV 4-stroke
    Engine TypeOHV 4-stroke
    Engine Displacement301 cc
    Spark ArrestorYes
    Emissions ComplianceEPA

    Electrical

    Voltage (AC)120/240V 60 Hz
    Voltage (DC)5
    Running Amps41.7/20.8 A
    Peak Amps52.1/26 A
    AC Frequency60 hz
    Current41.7/20.8 amps
    GFCI OutletsNo
    NeutralFloating
    USB Outlets2x 5V USB port
    DC Outlets2x 5V USB port
    AC Outlets2x Duplex 120V 20A (5-20R)1x 120V 30A (TT-30R)1x 120/240V 30A (L14-30R)
    Total Harmonic Distortion (THD)1.5 %

    Dimensions

    Dimensions27 x 25 x 24 inches
    Weight119.5 lbs

    Other

    Automatic Low Oil ShutdownYes
    Emissions ComplianceEPA
    Automatic Voltage RegulationYes
    Automatic Voltage RegulatorYes
    Covered OutletsYes
    Fuel GaugeYes
    Fuel Tank Capacity4.2 gallons
    Included AccessoriesTool kit, 2 altitude kits, and wheel kit
    IndicatorsYes
    InverterYes
    Overload ProtectionLow oil and overload protection
    Parallel CapableNo
    Recoil StartYes
    RV ReadyYes
    Starter TypeRecoil
    Starting SystemRecoil
    UPC044459062516
    Warranty2 years
    WheelsYes

    Core

    Fuel TypeGasoline

    Runtime

    Runtime @ 50%8.1 hours
    Runtime @ 50% Load (Gasoline)8.1 hours

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