Diesel Generators
Built for Performance.

Customers often ask whether using a diesel generator is more economical than commercial electricity. Under normal conditions, when reliable grid electricity is available, commercial electricity will generally cost less than generating electricity with a diesel generator.

What costs should be considered when using a diesel generator?

1. Generator purchase cost. A frequently used generator may require a higher-quality engine and generator configuration because fuel consumption, maintenance and long-term reliability become important factors.
2. Generator purchase or rental cost. The price of a diesel generator varies according to engine brand, power rating and configuration.
3. Maintenance cost. Diesel generators require regular maintenance. Even when a generator is not frequently operated, air filters, oil filters, fuel filters and lubricating oil may still require periodic replacement.
4. Operator labor cost. Depending on the project and operating environment, additional labor may be required to operate and maintain the generator.

For these reasons, diesel generators are commonly selected as standby power sources where reliable grid electricity is available. However, for remote areas, construction projects, mining operations, emergency power and locations with unstable electricity supply, a diesel generator can become an important or even essential power solution.

Maintaining the diesel generator at an appropriate operating temperature is important for normal engine operation. If coolant temperature remains too low, several operating problems may occur.

1. Reduced combustion efficiency

When coolant temperature is too low, the combustion chamber may not reach the intended operating temperature. Incomplete combustion can reduce engine power output and affect fuel efficiency.

2. Increased mechanical stress and wear

Low operating temperature can affect the thermal conditions of mechanical components. During winter operation, extremely low ambient temperatures may also increase the risk of coolant freezing if the cooling system is not properly protected.

3. Reduced lubrication performance

Low temperature can make lubricating oil more viscous and reduce its flowability. This may affect oil circulation and lubrication of engine components.

4. Poor starting performance

When the engine operates at very low temperatures, starting may take longer and the engine may experience greater load during the starting process.

1. Insulate the generator

In cold weather, excessive cooling can affect generator operation. Generator insulation covers and suitable insulation measures can help reduce heat loss, especially in cold regions.

2. Select suitable diesel fuel

Low temperatures can affect diesel fuel flowability and viscosity. Winter-grade fuel with suitable low-temperature characteristics should be selected according to local environmental conditions.

3. Use suitable antifreeze coolant

The cooling system should use suitable antifreeze coolant in low-temperature environments. Coolant concentration should be checked regularly. Untreated water should not be used as engine coolant where freezing is possible.

4. Start the generator correctly

Under low-temperature conditions, allow the engine to operate at low speed for approximately 3–5 minutes during warm-up before normal operation, while checking lubrication and operating conditions.

5. Check and replace filters

Cold and dusty operating environments can increase the requirements for air and fuel filtration. Regular filter inspection and replacement can help protect the engine from excessive wear.

1. Keep the generator exterior and surrounding area clean. Remove dirt, oil and dust that may affect heat dissipation.
2. Prevent oil, water and other liquids from entering the generator. Remove foreign objects before starting the equipment.
3. During warm-up, monitor the engine and generator for abnormal operating sounds. Stop and inspect the equipment if unusual noise is detected.
4. Monitor the control panel, including current, frequency, voltage, power factor and power readings.
5. Check electrical connections regularly and ensure that they are secure.
6. Check generator grounding to ensure reliable grounding.
7. Inspect conductive components such as slip rings and brushes where applicable.
8. Check for abnormal sparks, burning smells, smoke or other signs of insulation problems.
9. Avoid sudden excessive load changes and avoid prolonged overload or severely unbalanced three-phase operation.
10. Maintain proper ventilation and heat dissipation and protect the generator from moisture and excessive direct sunlight.

The three major filters of a diesel generator are the oil filter, air filter and fuel filter. The "two oils" refer to fuel and lubricating oil. Regular replacement helps reduce contamination and protect engine components.

Oil Filter

The oil filter removes particles and contaminants from engine oil. During maintenance, replace the old filter and install the new filter according to the manufacturer's recommended procedure and torque.

Air Filter

The air filter removes dust and particles from intake air and helps protect the engine from contamination. Inspect and replace it according to the operating environment and manufacturer's maintenance schedule.

Fuel Filter

The fuel filter removes contaminants and water from diesel fuel and helps protect the fuel system.

Lubricating Oil

Drain used lubricating oil and refill with suitable new oil according to the engine manufacturer's requirements.

Fuel

Use suitable diesel fuel with appropriate quality and grade for the operating environment.

The exact replacement interval should follow the engine manufacturer's maintenance schedule and actual operating conditions.

Black Smoke

Black smoke generally indicates incomplete combustion or excessive fuel relative to available air.

• Worn piston rings or cylinder liners can reduce compression pressure.
• Poor injector atomization or injector dripping can affect fuel-air mixing.
• Incorrect combustion chamber geometry or compression clearance can affect combustion.
• Incorrect fuel injection timing can cause incomplete combustion.
• Excessive fuel supply, heavy engine load, poor fuel quality or low operating temperature can also contribute to black smoke.

Blue Smoke

Blue smoke can indicate that lubricating oil is entering the cylinder and being burned.

• Restricted air intake or a blocked air filter.
• Excessive oil level under certain operating conditions.
• Lubricating oil contamination of fuel.
• Worn piston rings, pistons or cylinder liners.
• Cylinder gasket or oil passage related problems.

White Smoke

White smoke may occur during cold starting because of low cylinder temperature, particularly during winter. Persistent white smoke after the engine reaches operating temperature may indicate a fault.

• Coolant entering the cylinder because of cylinder liner or gasket damage.
• Poor fuel injector atomization.
• Incorrect fuel injection timing.
• Water or air contamination in fuel.
• Low injection pump pressure or insufficient compression caused by engine wear.