The Importance of Correctly Assessing The Generator Engine

When purchasing a generator, one must consider its intended use. The required rated power for the application may seem obvious, but there are many factors to consider before purchasing a generator. The guidelines presented in this article will better explain the correct application of generator driven engines in the installation of AC diesel generators.

Standby power rating

Rated standby power generators usually refer to the more common rated diesel generators. Their main application is to provide emergency power for a limited time during power outages. The backup rated generator has no overload capacity. It is worth noting that under no circumstances should the backup rated generator be operated together with the utility power source.

The rated value of the backup power supply should be applicable to devices where the public power supply is available. A typical standby engine rating should be a maximum 80% average load factor of approximately 200 hours per year. It includes less than 25 hours of standby operation time per year. The reserve rated power shall not be used unless there is a genuine emergency power outage. According to relevant guidelines, scheduled power outages by power companies are not considered emergency power outages. Most automatic transfer switches can be used for manual load transfer for testing purposes.

Main rated power

In applications where users do not purchase electricity from public utilities, rated main power generators should be used. The main power supply applications are divided into two different categories:

Infinite runtime

This rated power refers to the maximum power obtained at a variable load setting for unlimited operating time each year. It is not recommended to exceed 70% of the main rated power during any 250 hour operating cycle. If the engine operates at 100% primary power, the annual working hours shall not exceed 500 hours. Overloading should be avoided, but a 10% overload that can last for 1 hour during a 12 hour operating cycle is acceptable.

Limited running time

Under non variable load conditions, the main power supply is available for a limited time. Limited main power supply is suitable for expected power outages, such as planned reduction of public power supply. Below the maximum rated power level, the engine of a diesel generator can run for 750 hours per year. It is important to never exceed the maximum rated power in this situation. Finally, users should recognize that continuous high load use can shorten the lifespan of any engine. In applications lasting over 750 hours per year, it is recommended to maintain the engine's continuous rated power.

Continuous rated power

Continuous rated power for 100% constant load power supply annually. Continuous rated power devices are widely used in applications that cannot be reached by the power grid. These applications include mining, agriculture, or military operations.

The influence of height and temperature on the rated power of the generator

Before rated engine power, altitude and temperature need to be considered. The engine can operate at an altitude of 3000 feet. Altitude and temperature of 100 ° F do not lower the standby power rating. For rated primary power, the engine can operate at an altitude of 5000 feet. Altitude and temperature of 100 degrees Fahrenheit, without power derating. For continuous operation at higher altitudes, the engine should be configured to limit performance to 3% per 1000 feet. Altitude and 1% of intake temperature every 10 ° F.

Please consult with electrical contractors or Top Power Generator experts for more information on rated power to determine the most suitable generator and rating for your specific needs. If you would like to get more information welcome to contact us via sales@dieselgeneratortech.com.