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GENMAX · Inverter generator

GM13500iETC

Gasoline + Propane + Natural gas inverter generator with 13,500 peak watts

11,500W running13,500W peak550cc OHVGasoline + Propane + Natural gas
Compare retailer offers Retail pricing varies
GENMAX GM13500iETC 13500W Tri-Fuel Inverter Generator（2026 Model ）— 50A Outlet, ATS 2-Wire Auto-Start, Bluetooth&CO Sensor
Official product image: GENMAX

Visual spec gallery

The deciding numbers, made scannable.

01 · Maximum output

13,500W peak

Continuous output11,500W running

Size around running load first, then confirm the peak rating covers the largest startup surge.

02 · Fuel output

Gasoline + Propane + Natural gas

Gasoline

11,500W run · 13,500W peak

Propane

10,500W run · 12,500W peak

Natural gas

9,500W run · 10,500W peak

Alternative-fuel ratings are shown only when GENMAX publishes a fuel-specific figure.

03 · Portability

273.68 Pounds

Unit weight

30.7"L x 24"W x 29.5"H

Dimensions

Sound rating

62 dBA

04 · Controls & ownership

Starting

Electric / Recoil

CO shutoff

Manufacturer-listed

Parallel

Not listed

Warranty

3 Year

Official product gallery

Every manufacturer view in one place.

GENMAX imagery can include the enclosure, control panel, outlets, dimensions, feature callouts, and included accessories.

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Complete specifications

Manufacturer data, organized for comparison.

Power ratings, features, imagery, manuals, and seller links come from GENMAX’s current U.S. model page. A missing figure is labeled instead of estimated.

Never run a portable generator indoors. Keep it at least 20 feet from occupied buildings with exhaust directed away from doors, windows, and vents. Use a qualified electrician and approved transfer equipment for home connections.

Model overview

11,500 running watts and 13,500 peak watts for home backup and rv power. Confirm exact configuration and included accessories with the seller before purchase.

Fuel-specific output

Gasoline
11,500W running / 13,500W peak
Propane
10,500W running / 12,500W peak
Natural gas
9,500W running / 10,500W peak

Operation & ownership

Engine
550cc OHV
Voltage / frequency
120V / 60 Hz
Runtime
up to 11.2 hours on a 6
Fuel capacity
6.9-gallon fuel tank
Sound
62 dBA
Starting methods
Electric / Recoil
Unit size / weight
30.7"L x 24"W x 29.5"H / 273.68 Pounds
Warranty
3 Year

Connections

【High-Capacity Output & Multiple Outlets】Powered by a robust 550cc 4-stroke OHV engine, this generator comes with a full range of outlets: 1× 120V/240V 14-50R (ideal for EV charging & heavy-duty tools), 1× 120V L5-30R, 4× 120V 5-20R GFCI outlets, and 12V DC ports. Charge multiple devices simultaneously without overload risks.

Manufacturer feature details

【Triple-Fuel Flexibility】Switch between gasoline (13500 peak watts, 11500 running watts), propane (12500 peak watts, 10500 running watts), and natural gas (10500 peak watts, 9500 running watts) via a dedicated fuel selector switch. Enjoy flexible, uninterrupted power for long-term home backup, RV adventures, and high-demand job site operations.
【Clean & Stable Inverter Power】Delivers ≤3% Total Harmonic Distortion (THD) pure sine wave power, safe for sensitive electronics like laptops, phones, and medical equipment, Perfect for modern digital lifestyles.
【High-Capacity Output & Multiple Outlets】Powered by a robust 550cc 4-stroke OHV engine, this generator comes with a full range of outlets: 1× 120V/240V 14-50R (ideal for EV charging & heavy-duty tools), 1× 120V L5-30R, 4× 120V 5-20R GFCI outlets, and 12V DC ports. Charge multiple devices simultaneously without overload risks.
【5 Versatile Start Options】Choose from 5 convenient start methods: Push-Button Electric Start, Remote Key Fob Start, Bluetooth App Control, Recoil Backup Start, and ATS 2-Wire Auto-Start for automatic power kick-in during outages. Perfect for unattended home backup and busy job site use.
【Ultra-Quiet & High-Efficient Operation】Eco-Mode auto-adjusts engine speed to match your load, reducing noise to just 62 dB(A) at 25% load (as quiet as a normal conversation) and extending runtime up to 11.2 hours on a 6.9-gallon fuel tank. The built-in soft LED light illuminates the control panel, ensuring easy operation in the dark—no fumbling during power outages or nighttime use.
【Comprehensive Protection & Portable Design】Features full-system protection against overload, over/under voltage, short circuit, and overheating to safeguard both the generator and your devices. Equipped with a sturdy frame, durable wheels, and a foldable handle for effortless transport and compact storage.
【Safety Features & CARB Certified】Includes a CO Shield automatic shutdown system to prevent carbon monoxide poisoning. The digital monitor displays real-time wattage, voltage, runtime, and critical alerts (e.g., overload, low oil). CARB certified for legal sale and use in all 50 U.S. states. Backed by a 3-Year Limited Warranty + ongoing technical support.
Show the full manufacturer specification table
Brand
GENMAX
UPC
784482491357
Fuel Type
Tri Fuel
Manufacturer
GENMAX
Power Source
Fuel Powered
Part Number
GM13500iETC
Item Weight
273.68 Pounds
Item Weight
274 pounds
Output Wattage
13500
Item model number
GM13500iETC
Special Feature
CO Sensor
Style
GM13500iETC
Included Components
NG Quick Connector(1)Adapter(1)LPG Hose(1)NG Hose(1), Spark Plug Socket Wrench(1)Dual-Purpose Screwdriver(1)Funnel(1)
Special Features
CO Sensor
Product Dimensions
30.7"L x 24"W x 29.5"H
Batteries Required?
No
Model Name
GM13500iETC
Warranty Description
3 Year

Current seller links

Compare offers from GENMAX-listed retailers.

These destinations are supplied on the official model page. Prices and availability can change.

AMAZONGenerator Superstore

Best-fit uses

  • Home backup
  • RV power
  • Jobsite tools
  • High-demand loads

Standout features

  • 11,500 running / 13,500 peak watts
  • Gasoline + Propane + Natural gas
  • Electric / Recoil start
  • CO shutdown system

Compare it with your actual load.

Run your essentials through the calculator before choosing a generator.

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Official sources:Model pageAll GENMAX generatorsVerified September 15, 2026