1. Información de seguridad
Operating a generator requires adherence to strict safety guidelines to prevent injury or property damage. Always read and understand the entire manual before operating the GENMAX GM12500iET generator.
Seguridad con el monóxido de carbono (CO)
This generator is equipped with a built-in CO sensor for enhanced safety. The CO sensor is designed to shut down the generator if harmful levels of carbon monoxide accumulate in the operating area. However, this feature is a supplement and does not replace safe operating practices.
- Operate Outdoors Only: Always operate the generator outdoors in a well-ventilated area, far away from windows, doors, and vents to prevent carbon monoxide from entering enclosed spaces.
- Exhaust Direction: Ensure the exhaust is directed away from people and buildings.
- Alarmas de CO: Install battery-operated carbon monoxide alarms in your home or RV and check them regularly.
Seguridad del combustible
- Flammable Fuels: Gasoline, propane (LPG), and natural gas (NG) are highly flammable. Handle all fuels with extreme caution.
- No Fumar: Do not smoke or allow open flames near the generator or fuel storage areas.
- Repostaje: Always turn off the generator and allow it to cool before refueling with gasoline.
- Almacenamiento: Store fuels in approved containers in a well-ventilated area, away from ignition sources.
Seguridad eléctrica
- Condiciones secas: Nunca opere el generador bajo la lluvia, la nieve o la humedad. Mantenga las manos secas al manipular componentes eléctricos.
- Toma de tierra: Asegúrese de que el generador esté conectado a tierra correctamente de acuerdo con los códigos eléctricos locales.
- Protección contra sobrecarga: Do not overload the generator. Utilize the circuit breakers to prevent damage.
- Salidas ICFT: The generator features GFCI outlets for protection against electric shock.
2. Producto terminadoview
The GENMAX GM12500iET is a powerful and versatile tri-fuel inverter generator designed for various applications, including home backup, RV use, and camping. It offers flexible fueling options, clean power output, and multiple starting methods.

Image: The GENMAX GM12500iET Tri-Fuel Inverter Generator shown with gasoline, propane, and natural gas options, highlighting its versatile fuel technology.
Características principales
- Capacidad de tres combustibles: Operates on Gasoline (12500 surge, 10500 running watts), Propane (LPG 11500 surge, 9500 running watts), and Natural Gas (NG 10000 surge, 8500 running watts).
- Clean Inverter Power: Delivers less than 3% Total Harmonic Distortion (THD), making it safe for sensitive electronics.
- Salida de alta capacidad: Features a 458cc OHV engine with multiple outlets including 120V/240V 50A (NEMA 14-50R), 120V 30A, 120V 20A, 12V DC, and dual USB ports.
- Control digital inteligente: Digital display shows wattagmi, volumentage, frequency, runtime, fuel level, and alerts.
- 4-Way Start: Electric Start, Bluetooth App, 2-Wire Auto Start, and Recoil Backup.
- Modo ecológico: Automatically adjusts engine speed to load, reducing noise and extending runtime.
- Diseño portátil: Equipped with a robust frame, wheels, and a foldable handle for easy transport.
- Características de seguridad: Includes a built-in CO sensor and comprehensive protection against overload, over/under voltage, cortocircuito y sobrecalentamiento.

Image: The GENMAX GM12500iET generator is depicted as suitable for multiple scenarios, including home backup, RV travel, camping, and powering tools at job sites.
3. Configuración
Before starting the generator, proper setup is crucial for safe and efficient operation.
3.1 Desembalaje e inspección
- Retire con cuidado el generador y todos los accesorios del embalaje.
- Inspect the generator for any signs of shipping damage. If damage is found, contact customer support immediately.
- Verify all included components are present as listed in the 'What Comes in the Box' section.

Image: A visual representation of the items included in the GENMAX GM12500iET package, such as a spark plug wrench, screwdriver, remote control key, funnel, battery charger, NG quick connector, LPG hose, NG hose, and automatic start/stop cable.
3.2 Conjunto de rueda y manija
Attach the wheels and foldable handle using the provided hardware. This design facilitates easy transport of the generator.

Image: A person easily transporting the GENMAX GM12500iET generator across a lawn, demonstrating its easy transport design with a foldable handle and durable wheels.
3.3 Añadir aceite de motor
- Localice la tapa/varilla de nivel de aceite.
- Asegúrese de que el generador esté sobre una superficie nivelada.
- Using the provided funnel, slowly add the recommended engine oil (refer to specifications for type and capacity) until it reaches the upper mark on the dipstick. Do not overfill.
- Vuelva a colocar de forma segura la tapa de llenado de aceite.
3.4 Connect Battery
- Ubique el compartimiento de la batería.
- Connect the positive (+) battery cable (red) to the positive (+) terminal and the negative (-) battery cable (black) to the negative (-) terminal. Ensure connections are secure.
3.5 Conexión de combustible
The GM12500iET supports three fuel types: Gasoline, Propane (LPG), and Natural Gas (NG).
- Gasolina: Fill the fuel tank with fresh, unleaded gasoline. Do not use E85 or mixed fuels.
- Propano (GLP): Connect a standard propane tank to the dedicated LPG inlet using the provided LPG hose. Ensure all connections are tight to prevent leaks.
- Gas Natural (GN): Connect to a natural gas supply line using the provided NG hose and quick connector. Ensure connections are secure and leak-free.
Importante: Only use one fuel type at a time. Select the desired fuel using the fuel selector switch on the control panel.
Video: A detailed instructional video (22:55) covering the setup and initial preparation of the GENMAX GM12500iET Tri-Fuel Inverter Generator.
4. Instrucciones de funcionamiento
Follow these steps to safely start and operate your GENMAX GM12500iET generator.
4.1 Panel de control terminadoview
Familiarícese con los componentes del panel de control antes de utilizarlo.

Imagen: Un primer plano view of the generator's control panel, showing the digital display, main switch, fuel source switch, LPG/NG inlet, AC breakers, ground terminal, various AC outlets (50A, 30A, 20A), DC 12V outlet, USB ports, and the battery charging port.
4.2 Arranque del generador
The GM12500iET offers four starting methods:
- Arranque eléctrico:
- Asegúrese de que el generador esté sobre una superficie nivelada y que todas las conexiones estén seguras.
- Select the desired fuel type using the fuel source switch.
- Turn the main switch to the 'ON' position.
- Press and hold the 'START/STOP' button until the engine starts.
- Bluetooth App Start:
- Download the GENMAX app to your smartphone.
- Pair your device with the generator via Bluetooth.
- Follow the in-app instructions to start the generator remotely.
- 2-Wire Auto Start (for Home Backup):
- Connect the provided 2-wire auto start cable to a compatible automatic transfer switch (ATS) or home backup system.
- Ensure the 'AUTO GEN START SW' is in the 'ON' position.
- The generator will automatically start when power is lost and shut down when utility power returns.

Image: The GENMAX GM12500iET generator is shown providing power to an RV, illustrating the convenience of its Auto Gen Start feature with a communication cable for automatic starting and stopping.
- Recoil Backup Start:
- Ensure the main switch is 'ON' and fuel is selected.
- Tire de la manija de arranque de retroceso con firmeza y suavidad hasta que el motor arranque.
4.3 Funcionamiento en modo ecológico
Engage Eco-Mode by pressing the 'ECO' button on the control panel. In Eco-Mode, the engine speed automatically adjusts to the electrical load, which reduces fuel consumption and noise levels, especially during light load conditions. This feature extends runtime and is ideal for quiet environments.

Image: The GENMAX GM12500iET generator operating outdoors, demonstrating its stable sine wave and low-noise technology, with a sound level indicator showing 62 dB at 7 meters.
4.4 Conexión de cargas eléctricas
- Once the generator is running stably, plug in your electrical devices or connect to your transfer switch.
- No exceda la potencia nominal de funcionamiento del generador.tage. Monitor the digital display for wattage salida.
- Ensure all connected devices are in good working order and their power requirements are within the generator's capacity.
Video: An instructional video (4:28) demonstrating the operational procedures and features of the GENMAX GM12500iET generator.
5. Mantenimiento
Regular maintenance ensures the longevity and reliable performance of your GENMAX GM12500iET generator.
5.1 Aceite de motor
- Comprobar el nivel de aceite: Antes de cada uso, compruebe el nivel de aceite del motor y añada si es necesario.
- Cambio de aceite: Change the engine oil after the first 20 hours of operation, then every 100 hours or annually, whichever comes first. Refer to the specifications for recommended oil type.
5.2 Filtro de aire
- Inspección: Inspect the air filter element every 50 hours or monthly.
- Limpieza/Reemplazo: Clean or replace the air filter element as needed, especially in dusty conditions. A dirty air filter can reduce engine performance and increase fuel consumption.
5.3 bujía
- Inspección: Inspeccione la bujía cada 100 horas o anualmente.
- Limpieza/Reemplazo: Clean or replace the spark plug if it is fouled or worn. Ensure the gap is set correctly according to the engine specifications.
5.4 Sistema de combustible
- Filtro de combustible: Inspect and clean or replace the fuel filter as recommended in the full manual.
- Almacenamiento de combustible: For gasoline, use a fuel stabilizer if storing the generator for extended periods. Drain the carburetor if storing for more than 30 days without stabilizer.
5.5 Limpieza general y almacenamiento
- Mantenga el generador limpio y libre de residuos.
- Guarde el generador en un área seca y bien ventilada, lejos de la luz solar directa y de temperaturas extremas.
- If storing for an extended period, perform all necessary maintenance, including draining fuel (for gasoline) or disconnecting propane/natural gas lines.
6. Solución de problemas
This section provides solutions to common operational issues. For more complex problems, contact GENMAX technical support.
| Problema | Posible causa | Solución |
|---|---|---|
| El motor no arranca |
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| Baja potencia de salida / El motor se cala bajo carga |
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| Generator runs but no power output |
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| CO sensor shutdown |
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Video: A brief instructional video (3:36) that may cover common troubleshooting steps or specific features of the generator.
7. Especificaciones
Detailed technical specifications for the GENMAX GM12500iET Tri-Fuel Inverter Generator.
| Característica | Especificación |
|---|---|
| Nombre del modelo | GM12500iET |
| Marca | GENMAX |
| Tipo de motor | 4 tiempos, OHV |
| Cilindrada del motor | 458 centímetros cúbicos |
| Tipo de combustible | Tri combustible (gasolina, propano, gas natural) |
| Gasoline Starting Wattage | 12500 vatios |
| Gasoline Running Wattage | 10500 vatios |
| Propane (LPG) Starting Wattage | 11500 vatios |
| Propane (LPG) Running Wattage | 9500 vatios |
| Natural Gas (NG) Starting Wattage | 10000 vatios |
| Natural Gas (NG) Running Wattage | 8500 vatios |
| Volumen del tanque | 6.1 galones |
| Distorsión armónica total (THD) | ≤3% |
| Nivel de ruido (25% de carga) | Tan bajo como 62 dB(A) |
| Dimensiones del producto (L x An x Al) | 30.9" x 22.63" x 29.33" |
| Peso del artículo | 251.92 libras |
| Características especiales | CO Sensor, Bluetooth, 2-Wire Auto Start, Eco-Mode |
| Componentes incluidos | Spark Plug Socket Wrench, Wrench, Remote Control Key, Funnel, Battery Charger, NG Quick Connector, LPG Hose, NG Hose, Automatic Start/Stop Cable |
8. Garantía y soporte
GENMAX is committed to providing reliable products and customer satisfaction.
8.1 Información de garantía
The GENMAX GM12500iET Tri-Fuel Inverter Generator is backed by a Garantía limitada de 3 añoEsta garantía cubre defectos de materiales y mano de obra en condiciones normales de uso y servicio. Conserve su comprobante de compra para reclamaciones de garantía.
For specific terms and conditions of the warranty, please refer to the warranty card included with your product or visit the official GENMAX websitio.
8.2 Soporte técnico
Should you encounter any issues or require assistance with your generator, GENMAX offers ongoing technical support. Please have your model number (GM12500iET) and serial number ready when contacting support.
Contact information for technical support can typically be found on the GENMAX website or in the documentation provided with your generator.