Genmax GM10500iETC - 8500/10500W Tri Fuel Inverter Generator With Remote Start

The Genmax GM10500iETC is a powerful tri-fuel inverter generator with a rated wattage of 8,500 W and a starting wattage of 10,500 W. (Read full specs)

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Zoom on the Genmax GM10500iETC

In summary, the Genmax GM10500iETC is a powerful portable inverter generator especially useful for:

  • Homeowners who want to be sure of their ability to power their fridges, cooking tools, heating and lighting equipment during power failures
  • Tailgating and campground aficionados with the desire of enjoying power anywhere they go

In the following paragraphs, we shall explore the power characteristics, available outlets, portability, and any additional features of the device.

Power & Run Time

The Genmax GM10500iETC in use

The Genmax GM10500iETC

The Genmax GM10500iETC delivers 120/240V and is equipped with a tri-fuel technology, enabling it to operate on gasoline, propane, or natural gas. When powered by gasoline, it achieves a running wattage of 8,500W and a peak wattage of 10,500W. Switching to propane provides 8,000 rated watts and 9,500 peak watts, while natural gas operation delivers 6,800W of rated wattage and 8,400W of starting wattage. The impressive running wattage makes this unit one of the biggest inverter generators currently on the market. Furthermore, its parallel capability (parallel kit not included) allows for increasing of power output when connected to another similar or compatible unit, ensuring expanded energy capacity and reliability for various applications.

The inverter generator, rated for a noise of 64 dBA (just slightly more noisy than background music), provides flexibility in starting, offering both a simple traditional pull-start mechanism and a simple and elegant electric starter (battery included). Additionally, the GM10500iETC features remote starting, offering users increased convenience (key fob included).

Regarding its running time, the GM10500iETC, with a 6.9 gallons fuel capacity, can operate for around 8.1 hours at 50% load with a full tank of gasoline (fuel consumption around 0.85 GPH). When using propane, it can run for around 4 hours (estimation based on a 20 lbs tank - propane consumption around 1.18 GPH).

Thanks to its low <3% Total Harmonic Distortion (THD), the GM10500iETC produces a clean sine wave output, making it safe for your sensitive electronics when utilizing the AC outlets.


The control panel includes the following 6 AC outlets:

Two Duplexes 120V 20A (5-20R)
120/240V 30A (L14-30R) receptacle
120/240V 50A (14-50R) receptacle

In addition, it provides 1 DC outlet: there's a 12V 8A (cigarette lighter style) receptacle allowing you to easily charge your batteries.

Since it boasts a twist-lock L14-30R receptacle, the GM10500iETC is engineered to be transfer switch ready, ensuring easy integration with your breaker box to provide backup power to your home during outages. The unit also features an ATS plug, which makes it compatible with automatic transfer switches.


As the Genmax GM10500iETC is an inverter generator, its encased design (L30.9 x W22.6 x H29.3 in) offers more aesthetics than a conventional, open frame product. This type of design is the most modern and convenient way to recreationally generate power.

Despite its weight of 244.7 lbs, the generator is considered 'portable,' signifying its capability to be moved, albeit its heaviness may hinder easy transport. Still, once it is on the ground, its set of 2 wheels and its folding handle can easily solve the issue of low mobility and allow for easy relocation of the device.


Panel of the Genmax GM10500iETC

The GM10500iETC's control panel

To help you monitor the GM10500iETC's status and activity, its control panel is equipped with a digital data center, giving you information on the lifetime run hours, voltage, frequency and power output. To offer you even more control and easy operation during nighttime, the panel is LED-lit.

In addition to this info, 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.

Equipped with a built-in fuel gauge, the inverter generator facilitates swift gas level checks.

Considering security aspects, the generator boasts an overload protection (circuit breaker) and an automatic low oil shut-off, 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.

Beyond the standard documentation and an owner's manual (opens in a new tab) to assist with setup, the Genmax GM10500iETC ships with supplementary accessories: cover, RV adapter, key fob, neutral bonding plug, funnel, propane hose, battery charger, natural gas hose with NPT adapter and tool kit.

Product Videos

The Genmax GM10500iETC versus other generators

The following charts are provided to give you an idea of how some of the key specs of the Genmax GM10500iETC compare to multi-fuel generators of similar power (between 8000 and 9000 W).

  • With its weight of 244.7 lbs, the Genmax GM10500iETC is one of the heavier multi-fuel generators in the 8000-9000 rated wattage category. if you wish to prioritize weight, the Westinghouse iGen11000DFc is one of the top contenders in its power category, weighing only 187.4 pounds.
  • With a noise rating as low as 64 dBA, this inverter generator is among the quieter options available in its type and power range. If noise emissions are one of your priorities, you may be interested in the DuroMax XP11000iH, one of the least noisy generators similarly powerful as this one, rated for 61 dBA.
  • As far as autonomy is concerned, providing around 8.1 hours of runtime with a full tank at a 50% load, the GM10500iETC falls into the low end in comparison with other inverters of a comparable power output. For those prioritizing autonomy, the Champion 100416 could be considered, as it offers one of the longest run times among generators with similar power output, reaching around 12.5 hours.
  • Autonomy holds its importance, however, it is largely dependent on the generator’s fuel capacity and so, it is nonsensible to discuss it without mentioning fuel efficiency as well. In terms of fuel efficiency within its wattage range, this inverter generator falls short: it consumes approximately 0.85 GPH at a 50% load. If minimizing fuel usage is one of your key priorities, the Westinghouse iGen11000DFc is one of the most efficient devices with similar power output, with a gasoline consumption of only 0.66 gallons per hour.

Price comparison

As you can see from these interactive charts, when compared to other 8000-9000W multi-fuel generators, the Genmax GM10500iETC is on the expensive side of the price range.

While certainly not the cheapest of its kind, purchasing it would most likely also mean enjoying the reliability of a high-end product.

The bottom line

  • Tri-fuel
  • One of the biggest inverter generators on the market
  • Illuminated control panel
  • CO DETECT technology
  • Several accessories included
  • ATS plug
  • Remote start
  • Parallel capable
  • Inverter
  • Quiet for its power (64 dBA)
  • On the expensive side
  • 1-year warranty
  • On the heavy side (244.7 lbs)
  • Relatively low run time
  • Low fuel efficiency

Do you own the Genmax GM10500iETC 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 readyNo
FuelTri-Fuel (gasoline/propane/natural gas)
Engine458 cc OHV 4-stroke
Starting systemRecoil, Electric, Remote
Warranty1 year
VoltageAC: 120/240V 60 Hz, DC: 12V
Running watts8,500 W8,000 W6,800 W
Starting watts10,500 W9,500 W8,400 W
Running amps (@120/240V)70.8/35.4 amps66.7/33.3 amps56.7/28.3 amps
Peak amps (@120/240V)87.5/43.8 amps79.2/39.6 amps70/35 amps
Run time @50% load8.1 h4 h *N/A
Run time @25% loadUnknownUnknownN/A
GFCI outletsNo
Covered outletsYes
Automatic Voltage RegulationInverter
AC outlets
  • 2x Duplex 120V 20A (5-20R)
  • 1x 120/240V 30A (L14-30R)
  • 1x 120/240V 50A (14-50R)
DC outlets1x 12V 8A (cigarette lighter style)
Data centerPower output, lifetime run hours, voltage and frequency
IndicatorsLow oil, overload and output ready
Fuel tank6.9 gal
Fuel gaugeYes
Weight244.7 lbs
Approx. dimensions (L x W x H)30.9 x 22.6 x 29.3 in
Noise (lower limit)64 dBA
THD< 3%
ComplianceCARB, EPA, ANSI/PGMA G300-2018
SecurityLow oil and overload protection, CO monitoring
Spark arrestorYes
Accessories includedFunnel, tool kit, key fob, battery charger, natural gas hose with NPT adapter, propane hose, RV adapter, cover, neutral bonding plug, and battery
Country of originChina

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.
* Propane runtime is our own estimation, based on a 20 lbs tank and NIST 1994 GGE (Gasoline Gallon Equivalent) formula: 5.66 lbs of propane = 1 gal of gasoline.

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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 GM10500iETC 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 homeAC (10,000 BTU)15002200
Dish washer15003000
Electric fry pan15001500
Microwave (1000 watts)15001500
Refrigerator (energy star)1921192
Coffee maker600600
Total6792 W8292 W
For campingRV AC (11,000 BTU)10101600
RV refrigerator180600
Hair dryer18001900
Electric grill16501650
Microwave (1000 watts)15001500
Rice cooker650650
Total6790 W7380 W
For workTable saw18004500
Air compressor (1 hp)16006100
Belt sander11502400
Total5950 W10450 W
Where is it made? (Asked September 02, 2023)

The unit is manufactured in China.

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