1. Introduction
The Generac GP2500i is a compact and lightweight portable inverter generator designed to provide clean, stable power for sensitive electronics, tools, and appliances. Its fully enclosed design helps reduce noise levels, making it suitable for various outdoor activities and emergency backup power needs.

Image: The Generac GP2500i provides portable power for various applications including tailgating, hunting, DIY projects, and during power outages.
2. Key Features
- Portable Power Solution: Ideal for outdoor adventures like camping and tailgating, ensuring stable power.
- TruePower Technology: Delivers clean, stable power safe for sensitive electronics.
- Compact and Lightweight: Features a built-in handle for easy transportation.
- Fuel-Efficient Economy Mode: Automatically adjusts engine speed to reduce fuel consumption and noise emissions.
- Simple Startup: Integrated Off/Run/Choke Knob simplifies the starting process.
- USB Ports: Includes USB 2.1A ports for charging mobile devices.
- Parallel Ready: Connect two GP2500i generators for increased power (parallel kit sold separately).

Image: Key features of the GP2500i, including quiet operation, USB charging ports, and parallel capability.
3. Setup
3.1 Initial Setup (Oil and Fuel)
- Place the generator on a firm, level surface.
- Remove the oil fill cap/dipstick.
- Using the provided oil funnel, carefully add the included engine oil (SAE 5W-30) to the engine crankcase until it reaches the upper mark on the dipstick. Do not overfill.
- Securely replace the oil fill cap/dipstick.
- Unscrew the fuel cap.
- Fill the fuel tank with fresh, unleaded gasoline (minimum 87 octane) up to the fill line, ensuring not to overfill. The tank capacity is approximately 1.0 gallon.
- Securely replace the fuel cap.
3.2 Connecting Devices
The GP2500i features multiple outlets for connecting various devices:
- Two 120V AC outlets (max 18.3A)
- One 12V DC 8A outlet
- One USB 2.1A port
Ensure that the total wattage of connected devices does not exceed the generator's running wattage of 2200W.

Image: Rear view of the Generac GP2500i, highlighting the control panel with AC outlets, DC outlet, and USB port.
4. Operation
4.1 Starting the Generator
- Ensure the generator has sufficient oil and fuel.
- Turn the integrated Off/Run/Choke Knob to the 'Choke' position for cold starts. For warm starts, turn to 'Run'.
- Pull the recoil start handle firmly and steadily until the engine starts.
- Once the engine starts, slowly move the knob from 'Choke' to 'Run' as the engine warms up.
- Plug in your electrical devices.
4.2 Economy Mode
Activate the Economy Mode switch to allow the generator to automatically adjust engine speed based on the load. This reduces fuel consumption and noise when full power is not required.
4.3 Parallel Operation
The GP2500i is Parallel Ready, allowing you to connect two identical units for double the power output. A Generac parallel kit (sold separately) is required for this functionality. Follow the instructions provided with the parallel kit for proper connection.
4.4 Stopping the Generator
- Disconnect all electrical loads from the generator.
- Turn the integrated Off/Run/Choke Knob to the 'Off' position.
Video: This official Generac video demonstrates the features and benefits of the GP2500i Portable Inverter Generator, including its quiet operation, TruePower technology, and ease of use.
5. Safety Guidelines
DANGER: Using a generator indoors CAN KILL YOU IN MINUTES. Generator exhaust contains carbon monoxide. This is a poison you cannot see or smell.
- Outdoor Use Only: NEVER use the generator inside a home, garage, or any enclosed space, even if doors and windows are open. Only use OUTSIDE and far away from windows, doors, and vents.
- Proper Placement: Maintain a minimum distance of 5 feet (1.5m) from all objects.
- Fueling Safety: Do not fill the fuel tank above the lip or while the engine is running. Always allow room for fuel expansion.
- Hot Surfaces: The generator's exhaust and engine components become very hot during operation. Avoid contact to prevent burns.
- Read the Manual: Always read and understand the entire owner's manual before operating the generator to ensure safe and proper use.

Image: The Generac GP2500i with visible safety labels, emphasizing the dangers of carbon monoxide and hot surfaces.
6. Maintenance
Regular maintenance is crucial for the longevity and safe operation of your Generac GP2500i generator. Refer to the owner's manual for a detailed maintenance schedule.
- Engine Oil: Check engine oil level before each use. Change oil according to the schedule in the owner's manual.
- Spark Arrestor: Clean the spark arrestor every 50 hours of operation to prevent engine damage.
- Air Filter: Inspect and clean the air filter regularly. Replace if damaged.
- Spark Plug: Inspect and clean the spark plug periodically. Replace if necessary.
7. Troubleshooting
If you encounter issues with your Generac GP2500i, consult the troubleshooting section of your owner's manual. Common issues and their solutions are typically covered there.
- Engine Not Starting: Check fuel level, oil level, spark plug, and ensure the choke is set correctly.
- No Power Output: Check circuit breakers on the control panel. Ensure no overload condition.
- Engine Runs Rough: Check fuel quality, air filter, and spark plug.
For complex issues or repairs, contact Generac customer support or an authorized service center.
8. Specifications
| Specification | Value |
|---|---|
| Brand | Generac |
| Model Name | GP2500i |
| Starting Wattage | 2500 Watts |
| Running Wattage | 2200 Watts |
| Fuel Type | Gasoline |
| Fuel Tank Capacity | 1.0 Gallon |
| Run Time (50% load) | 4.5 Hours |
| Item Weight | 48 Pounds |
| Voltage | 120 Volts (AC) |
| Engine Type | 4 Stroke |
| Ignition System | Recoil Start |
| Special Features | Fully Enclosed Design, Low Oil Shutdown, Portable, Super Quiet |

Image: Visual representation of the GP2500i's wattage (2500W starting, 2200W running) and its compact 48 lbs weight.
9. Warranty and Support
For warranty information, technical support, or to locate an authorized service center, please refer to the contact details provided in your owner's manual or visit the official Generac website. Always keep your purchase receipt for warranty claims.