Genmax GM3300i - 3000/3300W Inverter Generator

The Genmax GM3300i is a compact and lightweight inverter generator with a rated wattage of 3,000 W and a starting wattage of 3,300 W. (Read full specs)

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Price History
Price history for the Genmax GM3300i
Latest updates:
  • $649.99 - June 18, 2024
  • $699.99 - June 11, 2024
  • $649.99 - May 29, 2024
  • $699.99 - May 14, 2024
  • $649.99 - March 12, 2024
  • $699.99 - December 5, 2023
  • $649.99 - November 23, 2023
  • $699.99 - November 7, 2023
Data source: tractorsupply.com
Since: June 27, 2023
  • Highest Price: $699.99 - June 27, 2023
  • Lowest Price: $649.99 - October 18, 2023


Zoom on the Genmax GM3300i

In short, the Genmax GM3300i is a compact and lightweight portable inverter generator adequately designed for:

  • RV travellers who wish to upgrade their experience to another level
  • People occasionally participating in outdoor fairs, festivals or events
  • DIYers who wish to improve their efficiency with tools
  • Homeowners who want to be able to use the most necessary devices in their household, even during a blackout
  • Tailgating and campground aficionados with the desire of enjoying power anywhere they go

The following sections will present you in detail its power characteristics, the different outlets it offers, its overall portability, and the extra features it benefits from.

Power & Run Time

The Genmax GM3300i in use

The Genmax GM3300i

Featuring a 145 cc (5.2 hp) Dinking OHV 4-stroke engine, the Genmax GM3300i operates using gasoline, providing 120V, with a running wattage of 3,000W and a starting wattage of 3,300W. Additionally, as the generator is parallel capable (parallel kit (opens in a new tab) not included), it can be linked to a second unit for more power.

Operating at a noise rating of 62 dBA (just slightly more noisy than a normal conversation), this inverter generator starts up with a manual recoil starter system.

The GM3300i's fuel tank holds 1 gallon, ensuring uninterrupted operation for up to 6 hours with a full tank (fuel consumption approximately 0.17 GPH).

Featuring a <3% Total Harmonic Distortion (THD), the GM3300i delivers a clean sine wave, guaranteeing the safety of your sensitive electronics plugged into its AC outlets.


The control panel includes the following 3 AC outlets:

Duplex 120V 20A (5-20R)
120V 30A (TT-30R) receptacle

It also sports 2 DC outlets: there's two 5V USB ports (USB-A) enabling convenient charging of devices like mobile phones and tablets.

The inclusion of a TT-30R receptacle (TT for 'Travel Trailer') makes this Genmax generator RV Ready, ideal for providing power to recreational vehicles.


As an inverter generator, the Genmax GM3300i showcases a closed design (L18.9 x W11.4 x H17.3 in), enhancing aesthetics and ensuring quieter operation compared to conventional, open frame models. The featured design follows the latest trends and is ideal for easy and recreational use.

Since the GM3300i weighs only 47.4 lbs, it can be labeled as a portable lightweight generator. A single person should have no trouble moving it around, ensuring power availability on the go. The inclusion of a handle (molded in the case) makes carrying it a breeze, adding to its convenience.


Panel of the Genmax GM3300i

The GM3300i's control panel

When its oil levels are insufficient, the generator is on overload and the generator is ready, you will be informed by the featured light indicators.

Considering security aspects, the generator boasts an automatic low oil shut-off and an overload protection (circuit breaker), offering peace of mind throughout operation.

It also benefits from Genmax's CO DETECT technology, which is designed to monitor the level of carbon monoxide present during the generator's operation. If the generator is positioned incorrectly and carbon monoxide levels rise to an unsafe level, the generator will automatically shut down.

Apart from the standard documentation and an owner's manual (opens in a new tab) to facilitate setup, the Genmax GM3300i features extra accessories: funnel and tool kit.

Product Video

The Genmax GM3300i versus other generators

The following charts are provided to give you an idea of how some of the key specs of the Genmax GM3300i compare to inverter generators of similar power (between 2500 and 3500 W).

  • Concerning weight, the Genmax GM3300i weighs only just 47.4 pounds, distinguishing itself as one of the lighter inverter generators amidst the 2500 to 3500 rated wattage range. If you are mindful of weight, the Pulsar PGD40iSCO is among the top contenders in this power range, with a dry weight of 46 pounds.
  • This inverter generator has a somewhat average expected noise for its type and power range, rated at 62 dBA. If noise is a concern for you, you could consider the Honda EU3000iS, which is one of the least noisy generators in its power range, rated at 50 dBA.
  • In terms of its autonomy, the GM3300i can operate for up to 6 hours at a 25% load, placing it within the lower bracket among generators of similar type and power range. If you consider autonomy on a single full tank as one of the deciding factors, one of the generators in the same power range that offers the highest run time is the Champion 200914, with up to 22 hours.
  • Run time is a key metric, but it's dependent on the generator's fuel capacity. Therefore, discussing fuel efficiency is necessary to get the full picture. This inverter generator reaches an estimated fuel consumption of 0.17 GPH (gallon per hour) at a 25% load, making it average, for the previously mentioned wattage range. If fuel consumption is your top priority, we suggest to check out the Energizer eZV3500P, which has a fuel consumption of only 0.13 GPH and thus, is one of the most efficient devices in our database.

Price comparison

As you can see from these interactive charts, when compared to other 2500-3500W inverter generators, the Genmax GM3300i is on the average side of the price range.

Therefore, this generator nicely fits in the expected budget for this kind of product.

The bottom line

  • In the expected price range
  • CO DETECT technology
  • Several accessories included
  • RV Ready
  • Parallel capable
  • Inverter
  • Lightweight (47.4 lbs)
  • Acceptable noise (62 dBA)
  • Decent fuel efficiency
  • No data center
  • 1-year warranty
  • Relatively low run time

Do you own the Genmax GM3300i and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

Features and Specifications

Parallel capableYes, cable not included
RV readyYes
Engine145 cc Dinking OHV 4-stroke
Starting systemRecoil
Warranty1 year
VoltageAC: 120V 60 Hz, DC: 5V
Running watts3,000 W
Starting watts3,300 W
Running amps25 amps
Peak amps27.5 amps
Run time @50% load4.5 h
Run time @25% load6 h
GFCI outletsNo
Covered outletsYes
Automatic Voltage RegulationInverter
AC outlets
  • 1x Duplex 120V 20A (5-20R)
  • 1x 120V 30A (TT-30R)
DC outlets2x 5V USB port (USB-A)
Data centerNo
IndicatorsLow oil, overload and output ready
Fuel tankPlastic, 1 gal
Fuel gaugeNo
Weight47.4 lbs
Approx. dimensions (L x W x H)18.9 x 11.4 x 17.3 in
Noise (lower limit)62 dBA
THD< 3%
ComplianceEPA, ANSI/PGMA G300-2018
SecurityLow oil and overload protection, CO monitoring
Spark arrestorYes
Accessories includedFunnel and tool kit
Country of originChina
Other model numbers‎GE-3300A

Unlike many websites, we did our best to research each of the specs above. That being said, we are not immune to making the occasional mistake or omission. Should you notice any missing or incorrect values, don't hesitate to suggest improvements so we can address the issue.

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About Genmax

GENMAX is a new portable generator brand registered by the Chongqing Dinking Power Machinery Co. LTD., which itself was founded in 2010 and is currently located in Chongqing, China. Dinking specializes in the general motor industry and manufactures portable generators, power sources, water pumps, garden machinery and construction machinery for foreign markets. Among most notable achievements are Dinking’s exclusive contract with Hyundai and 5th place in the ranking of Chinese foreign trade exporters in general motor industry (2016). GENMAX brand portfolio includes a sizeable selection of gas-powered generators covering all common wattage categories.

Warranty Information

The Genmax GM3300i is covered under a warranty for up to 1 year. This warranty may be limited and may not cover all parts of the generator.
For more information about the warranty of Genmax generators, please contact the Genmax Customer Support: 1-866-960-2920.

Questions & Answers

What can it power?
Examples of items that can be simultaneously powered.
The examples below are based on a maximum load of 80% and estimated wattages. For a more accurate estimation, use our wattage calculator.
ItemRunning WattsStarting Watts
At homeMicrowave (1000 watts)15001500
Refrigerator (energy star)1921192
Coffee maker600600
Total2292 W3292 W
For campingRV AC (11,000 BTU)10101600
RV refrigerator180600
Toaster oven800800
Total2390 W2980 W
For workGrinder14002500
Reciprocating saw730960
Total2130 W3230 W
How many ounces oil does a genmax 3300i take (Asked May 18, 2022)

Engine oil capacity is 15.3 fl. oz.

Where and how can I find parts for this product? I am having trouble finding anything for this generator (Asked July 15, 2022)

Replacement parts can be ordered directly through GenMax: 1-866-960-2920.

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