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GenmaxModel GM2200i

Genmax 1,800W Gas Generator Review

The GENMAX GM2200i is a 2200-watt gasoline inverter generator featuring a 79.7cc engine, CO detection, and parallel capability, designed for quiet and efficient power supply.

At a Glance

  • Running Watts
    1800W
  • Starting Watts
    2200W
  • Fuel Type
    Gasoline
  • Runtime (50%)
    6h
  • Noise Level
    58 dB
  • Weight
    41.9 lbs

Where to buy

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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

    • 79.7cc engine producing 2200 starting watts and 1800 running watts
    • Fully enclosed design for reduced noise levels
    • Built-in carrying handle for easy transport
    • Low idle mode for fuel efficiency and reduced sound emissions
    • USB port for charging mobile devices
    • Parallel ready to connect two GM2200i generators for increased power
    • CO Alert system that automatically shuts off the generator when unsafe carbon monoxide levels are detected

    Cons

    • No electric start option
    • No RV outlet available
    Best use cases
    Sensitive electronicsQuiet operationExpandable power

    Summary

    The Genmax GM2200i is a compact and efficient inverter generator designed for a variety of applications, making it an ideal choice for outdoor enthusiasts, campers, and homeowners looking for a reliable power source. With a starting wattage of 2200 watts and a running wattage of 1800 watts, this generator is capable of powering essential appliances, tools, and devices, ensuring you stay connected and comfortable in any situation.

    This generator is particularly well-suited for recreational activities such as camping or tailgating, where quiet operation and portability are crucial. With a fuel tank capacity of 1 gallon, the GM2200i provides a runtime of up to 8 hours at a 25% load, making it an excellent companion for extended use. Its lightweight design and inverter technology further enhance its appeal, allowing it to deliver clean and stable power for sensitive electronics.

    Power & Runtime

    The Genmax GM2200i operates on gasoline, a widely available fuel type that offers convenience for users. With a starting wattage of 2200 watts and a running wattage of 1800 watts, this generator can handle a variety of household items and outdoor gear. The noise level is rated at a mere 58 decibels, which is comparable to the sound of a normal conversation, making it suitable for use in residential areas or during quiet outdoor activities.

    Runtime is a key consideration for generator users, and the GM2200i excels in this area. It can run for up to 8 hours at a 25% load, which is ideal for light usage during camping trips or while powering small appliances at home. At a 50% load, the runtime decreases to 6 hours, still providing ample time for most applications. The fuel tank capacity of 1 gallon allows for these extended runtimes without frequent refueling, making it a practical choice for users who require consistent power.

    The generator features a total harmonic distortion (THD) percentage of less than 3%, ensuring that it produces clean power suitable for sensitive electronics. This is particularly important for users who need to charge devices like laptops or smartphones, as it minimizes the risk of damage from power fluctuations.

    Outlets

    The Genmax GM2200i is designed with versatility in mind, though it does not come with a wide array of outlets. The generator includes standard outlets that are suitable for various applications. However, specific outlet specifications were not detailed in the provided data.

    It is important to note that while the GM2200i is parallel capable, allowing users to connect two units for increased power output, it does not come with RV-ready outlets. This may limit its use for users looking to directly power RV appliances without additional equipment. Additionally, the generator does not have transfer switch capability, which is a consideration for homeowners looking to use it as a backup power source during outages.

    Portability

    Portability is one of the standout features of the Genmax GM2200i. With dimensions of 18.9 x 11.4 x 17.3 inches and a weight of just 41.9 pounds, this generator is easy to transport and store. Its compact size makes it an excellent choice for those who need a generator that can fit in tight spaces or be easily loaded into vehicles.

    The design of the GM2200i includes a sturdy frame that enhances its durability while maintaining its lightweight characteristics. The generator is equipped with convenient handles, allowing for easy lifting and maneuvering. Although the data does not specify wheels, the overall design promotes ease of transport, making it suitable for users who prioritize mobility.

    Features

    The control panel of the Genmax GM2200i is user-friendly, featuring clearly labeled controls and indicators. The inverter technology ensures that the power output is stable and clean, making it safe for sensitive electronics. The generator also includes essential safety features, although specific details on these features were not provided.

    Included accessories were not mentioned, but users can expect basic functionality without additional frills. The warranty offered is for 1 year, providing peace of mind for buyers who may have concerns about long-term reliability. Overall, the GM2200i is built with the essential features that users need for efficient operation.

    Recommended Audiences

    • Campers looking for a lightweight and portable power solution
    • Homeowners in need of a reliable backup generator for small appliances
    • DIY enthusiasts who require power for tools on job sites
    • Tailgaters wanting to power small electronics and appliances
    • Outdoor enthusiasts who need a quiet generator for recreational activities
    • Users seeking an inverter generator for clean power for sensitive devices
    • Individuals looking for a generator with a compact design for easy transport
    • Those who appreciate the convenience of parallel capability for increased wattage
    Updated: Jan 30, 2026

    Score Breakdown

    5.7
    / 10
    Rank #24 of 74 in Inverter (0-2,500W)
    Value (25%)
    Quality (25%)
    Practical (18%)
    Features (12%)
    Features (1.4 pts)
    • Inverter+1
    • Parallel Capable+0.4
    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:1,800W(recommended usable: 1,440W)
    • Surge:2,200W
    • Output:120V only
    • Inverter:Yes (clean power for electronics)

    Big-item compatibility

    Refrigerator
    Yes
    Sump Pump (1/3 HP)
    Yes
    Well Pump (1 HP, 240V)
    No

    Needs 240V output

    Furnace Blower
    Yes
    Central AC (3 Ton, 240V)
    No

    Needs 240V output

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

    Needs 240V output

    Electric Range/Oven (240V)
    No

    Needs 240V output

    Air Compressor (1 HP)
    No

    Exceeds capacity

    Example setups

    Essentials

    • Lights + Wi-Fi + Charging
    • Refrigerator
    • Furnace Blower

    Est. running: 1,000W

    Peak surge (single motor): 1,200W

    Avoid starting multiple motor loads at the same time.

    Essentials + Comfort

    • Lights + Wi-Fi + Charging
    • Refrigerator
    • TV + Entertainment System
    • Furnace Blower

    Est. running: 1,300W

    Peak surge (single motor): 1,200W

    Avoid starting multiple motor loads at the same time.

    Jobsite / Tools

    • Lights + Wi-Fi + Charging

    Est. running: 200W

    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.

    Genmax
    ReliabilityCAverage

    About Genmax

    Genmax is a generator manufacturer known for innovation, quality, and a diverse range of portable and standby generators.

    View all Genmax generators

    Warranty

    Coverage: 1 year

    Power by fuel

    FuelRunningStartingRuntime @50%Runtime @25%
    Gasoline1800W2200W6h8h

    Full Specifications

    Power

    Running Watts1,800 watts
    Starting Watts2,200 watts
    Starting Watts (Gasoline)2,200 W
    Running Watts (Gasoline)1,800 W

    Engine

    Engine79.7 cc Dinking OHV 4-stroke
    Engine TypeDinking OHV 4-stroke
    Engine Displacement79.7 cc
    Engine Oil10W-30
    Engine Oil Capacity0.1 Qt
    Spark ArrestorYes
    Emissions ComplianceEPA, ANSI/PGMA G300-2023

    Electrical

    Voltage (AC)120
    Voltage (DC)5
    PhaseSingle
    Running Amps15 A
    Peak Amps18.3 A
    AC Frequency60 hz
    Current15 amps
    GFCI OutletsNo
    USB Outlets2x 5V USB port (USB-A)
    DC Outlets2x 5V USB port (USB-A)
    AC Outlets1x Duplex 120V 20A (5-20R)
    Total Harmonic Distortion (THD)<3% %

    Dimensions

    Dimensions18.9 x 11.4 x 17.3 inches
    Weight41.9 lbs

    Other

    Automatic Low Oil ShutdownYes
    Emissions ComplianceEPA, ANSI/PGMA G300-2023
    Automatic Voltage RegulationYes
    Automatic Voltage RegulatorYes
    Carbon Monoxide SensorYes
    Covered OutletsYes
    Electric StartNo
    Fuel GaugeNo
    Fuel Tank Capacity1 gallons
    Included AccessoriesFunnel and tool kit
    IndicatorsYes
    InverterYes
    Noise Level58 dBA
    Overload ProtectionLow oil and overload protection, CO monitoring
    Parallel CapableYes
    Recoil StartYes
    Remote StartNo
    RV ReadyNo
    Starter TypeRecoil
    Starting SystemRecoil
    UPC738,349,925,141
    Warranty1 years
    WheelsNo

    Core

    Fuel TypeGasoline

    Runtime

    Runtime @ 25%8 hours
    Runtime @ 50%6 hours
    Runtime @ 25% Load (Gasoline)8 hours
    Runtime @ 50% Load (Gasoline)6 hours

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