1. Safety Information
Read and understand all safety precautions before operating the generator. Failure to follow these instructions may result in serious injury or death.
- Carbon Monoxide Hazard: Generators produce carbon monoxide, a colorless, odorless, poisonous gas. Operate the generator outdoors in a well-ventilated area, far from windows, doors, and vents. Never operate indoors or in enclosed spaces.
- Fire Hazard: Gasoline is highly flammable. Refuel in a well-ventilated area with the engine off and cool. Do not smoke or allow open flames near the generator. Store fuel in an approved container.
- Electrical Shock Hazard: Never operate the generator in wet conditions. Ensure all electrical connections are secure and dry. Do not overload the generator.
- Hot Surfaces: The generator's engine and muffler become very hot during operation and remain hot for a period after shutdown. Avoid contact to prevent burns.
- Children and Pets: Keep children and pets away from the generator at all times.
2. Setup
2.1 Unpacking and Inspection
Carefully remove the generator from its packaging. Inspect for any damage during shipping. Ensure all included components are present:
- Aceup Energy AI2500s Inverter Generator
- A bottle of engine oil
- Oil funnel (x2)
- Spark plug wrench

Figure 2.1: Aceup Energy AI2500s Inverter Generator and included accessories.
2.2 Adding Engine Oil
The generator is shipped without engine oil. Before first use, add the recommended amount of 4-stroke 10W-30 engine oil.
- Place the generator on a level surface.
- Locate and remove the oil fill cap/dipstick.
- Using the provided funnel, slowly add the engine oil until it reaches the upper mark on the dipstick. Do not overfill.
- Securely replace the oil fill cap/dipstick.
2.3 Adding Fuel
Use fresh, unleaded gasoline with an octane rating of 87 or higher. Do not use E85 or mixed fuels.
- Ensure the generator is off and cool.
- Open the fuel tank cap.
- Carefully pour gasoline into the fuel tank, avoiding spills. Do not fill above the red indicator line.
- Securely close the fuel tank cap.
2.4 Initial Startup Procedure
Follow these steps for the first startup and subsequent cold starts:

Figure 2.2: Engine Starting Procedure.
- Add 4-stroke 10W-30 oil.
- Add unleaded gasoline.
- Turn the fuel cap vent to the ON position.
- Rotate the OFF/ON/CHOKE dial to CHOKE.
- Switch the Economy switch to OFF.
- Pull the recoil starter slowly several times to allow gas to flow into the engine's carburetor. Then pull it quickly when resistance is felt.
- Once the engine starts, rotate the OFF/ON/CHOKE dial to ON.
- After the generator starts, you may connect electric appliances.
3. Operating Instructions
3.1 Control Panel Overview
Familiarize yourself with the control panel for safe and efficient operation.

Figure 3.1: Control Panel Layout.
3.2 Digital Display Meter
The intelligent gauge tracks voltage, run-time, fuel level, hertz, and power output. It also features low oil LED and economic mode indicators.

Figure 3.2: Digital Display Meter.
3.3 Connecting Electrical Devices
Connect your devices to the appropriate outlets:
- 120V AC Outlets: For standard household appliances.
- 12V DC Outlet: For 12V DC devices.
- USB Type A/C Ports: For charging sensitive electronic devices like phones and tablets.
The inverter technology with THD below 1.5% delivers clean power, suitable for sensitive electronics.
3.4 Eco Mode
Engage Eco mode to save fuel and reduce noise when operating at lower loads. The generator will automatically adjust engine speed to match the load.
Video 3.1: This video demonstrates the operation of an Aceup Energy inverter generator, including starting procedures, engaging Eco mode, and measuring power output with a connected load. It highlights the clean sine wave output, suitable for sensitive electronics.
3.5 Parallel Operation
The generator is parallel-ready, allowing you to connect two inverter generators for twice the power. A parallel kit is not included and must be purchased separately.
3.6 Shutting Down the Generator
- Disconnect all electrical loads from the generator.
- Turn the engine switch to the OFF position.
- Turn the fuel valve to the OFF position.
4. Maintenance
Regular maintenance ensures optimal performance and extends the lifespan of your generator.
4.1 Checking the Spark Plug
Periodically inspect the spark plug for wear, carbon buildup, or damage. Replace if necessary.
Video 4.1: This video provides instructions on how to check the spark plug and ensure the carburetor is unobstructed, which are key maintenance steps for generator performance.
4.2 Checking the Carburetor
Ensure the carburetor is free from obstructions. If fuel flow is restricted, cleaning may be required.
4.3 Oil Change
Change the engine oil after the first 20 hours of operation, and then every 50-100 hours or annually, whichever comes first.
4.4 Air Filter Maintenance
Clean or replace the air filter regularly, especially when operating in dusty conditions, to maintain proper engine performance.
4.5 Fuel Storage
If storing the generator for 30 days or longer, residual fuel needs to be discharged from the carburetor to prevent fuel degradation and starting issues.

Figure 4.1: Fuel Tank Vent.
5. Troubleshooting
This section provides solutions to common operational issues.
5.1 Engine Does Not Start
- Check Fuel Level: Ensure there is sufficient gasoline in the tank.
- Check Oil Level: Low oil will prevent the engine from starting due to the low oil shutdown feature.
- Choke Position: Ensure the choke is in the correct position for starting (CHOKE for cold starts, ON for warm starts).
- Spark Plug: Inspect the spark plug as described in Section 4.1.
- Carburetor: Check for obstructions in the carburetor as described in Section 4.2.
5.2 No Power Output
- Circuit Breaker: Check if any AC or DC circuit breakers have tripped. Reset if necessary.
- Overload: Reduce the connected load. The generator may have shut down due to an overload.
- Connections: Ensure all power cords are securely plugged into the generator and devices.
5.3 Engine Runs Poorly
- Fuel Quality: Use fresh, clean gasoline. Stale fuel can cause poor engine performance.
- Air Filter: A dirty air filter can restrict airflow. Clean or replace it.
- Spark Plug: A fouled or incorrectly gapped spark plug can affect engine running.
6. Specifications
| Feature | Specification |
|---|---|
| Model Name | AI2500s |
| Starting Wattage | 2500 Watts |
| Running Wattage | 1900 Watts |
| Engine Type | 79.8cc 4-stroke OHV air-cooling engine |
| Fuel Type | Gasoline |
| Tank Volume | 1.32 Gallons |
| Run Time (Quarter-Load) | Up to 10 hours |
| Noise Level (Eco mode, 23 ft) | Approximately 53 decibels |
| Voltage | 120 Volts |
| Frequency | 60Hz |
| Total Power Outlets | 5 (120V AC x2, 12V DC x1, USB Type A/C x2) |
| Item Weight | 39.7 Pounds |
| Product Dimensions | 19.68"L x 11.82"W x 17.66"H |
| Special Features | Automatic Shut Down, Extra-Long Run Time, Fuel Efficient, Fuel Gauge, Intelligent Gauge |
7. Warranty
The Aceup Energy AI2500s Inverter Generator is backed by a 2-year limited warranty under normal use. This warranty covers defects in materials and workmanship.
Please retain your proof of purchase for warranty claims.
8. Support
For technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact Aceup Energy customer support. Free lifetime technical guidance from experts is available.
Refer to the product packaging or the official Aceup Energy website for the most current contact information.







