Why Is My Generator Voltage Too High?
If your generator voltage is too high, first check the output frequency, engine speed, AVR voltage setting, and AVR sensing circuit. High voltage can also be caused by loose sensing wires, incorrect alternator connections, a wrong AVR model, a faulty AVR, or an excitation system problem. In our experience, we do not replace the AVR […]
Why Is My Generator Producing Low Voltage?
If your generator is producing voltage but the output is lower than its rated value, the most common causes include low engine speed, excessive load, incorrect AVR adjustment, AVR sensing problems, weak excitation, loose wiring, rotating diode failure, or alternator winding faults. In our experience, we do not start by adjusting or replacing the AVR. […]
How Do I Know If My Generator AVR Is Bad?
A bad generator AVR can cause no voltage, low or high voltage, unstable voltage, or voltage that does not respond correctly to adjustment. However, these symptoms alone do not confirm AVR failure. In our experience, we normally check generator frequency, AVR wiring and sensing, excitation, and alternator condition before replacing the AVR. The AVR is […]
Why Is My Diesel Generator Not Producing Voltage?
If your diesel generator starts and runs normally but produces no output voltage, do not assume the AVR has failed immediately. In our experience, the problem can come from the output breaker or connections, incorrect engine speed, AVR wiring or sensing, loss of excitation, rotating diodes, the exciter, or the alternator windings. We normally start […]
How to Increase Generator Load Safely
Short Answer A diesel generator load should be increased gradually in steps of 10%–25%, allowing the system to stabilize between each step. Sudden load application can cause frequency drop, voltage instability, or generator tripping, especially in standby systems. In our field experience, improper load increase is one of the most common hidden causes of generator […]
Can You Run a Diesel Generator at Low Load?
Short Answer: Running a diesel generator at low load is one of the most common causes of hidden engine damage. While the generator can technically operate at low load, doing so continuously will lead to wet stacking, carbon buildup, and long-term performance loss. In many real projects, this is not just an operating issue — […]
What Is the Minimum Load for a Diesel Generator?
Short Answer: A diesel generator should operate at no less than 30% of its rated load. Below this level, combustion temperature becomes too low, leading to wet stacking, carbon buildup, and long-term engine damage. In real projects, we recommend maintaining 50%–80% load for stable performance and engine longevity. Minimum Load Rule (Quick Reference) If you […]
How to Fix Black Smoke in a Diesel Generator
Short Answer Black smoke in a diesel generator is caused by too much fuel or insufficient air, resulting in incomplete combustion. To fix it quickly, reduce the load, check the air filter, and inspect the fuel system. In most cases, black smoke is caused by overloading, restricted air intake, or carbon buildup due to long-term […]
Is Black Smoke from a Diesel Generator Dangerous?
Short Answer: Yes, black smoke from a diesel generator is dangerous. It means the engine is not burning fuel completely, producing carbon particles (soot) and excessive emissions. In real projects, this not only affects health in enclosed environments, but also indicates inefficient operation, increased fuel consumption, and potential long-term engine damage. More importantly, if black […]