ISO Standards for Generator Sets:

1. ISO 8528:

   • Scope: Defines applications, ratings, performance, and characteristics of generator set components like engines, alternators, controls, and switchgear.
   • Functional Tests: Covers methods for functional and acceptance tests, including vibration and sound measurements.
   • Load Factor: Specifies that the average power output of generator sets over 24 hours should be 70% of the nameplate kW rating, 

2. ISO 3046:

   • Scope: Focuses on engine characteristics, including power ratings, fuel consumption, and vibration.
   • Conformance: Typically noted on a generator set’s specification sheet.

3. ISO 9001:

   • Scope: Establishes the requirements for a quality management system (QMS).
   • Certification: All MTU manufacturing facilities are ISO 9001:2015 certified.

4. ISO 14001:

   • Scope: Defines environmental management practices for manufacturing.
   • Certification: All MTU facilities are ISO 14001 certified.

5. ISO 17025:

   • Scope: Pertains to the testing and calibration of instruments used in performance and quality measurement.
   • Traceability: Ensures instruments are calibrated according to national standards.

Following, it is the introduction about the power rate of diesel generator defined by  ISO 8528 and ISO 3046. The most common types of power ratings for diesel generators are Standby, Prime, and Continuous, below is the detail definition.

1. Standby Power Rating

- Definition: The maximum power a generator can provide for a limited duration during an emergency outage.

- Usage: Used when the primary power source fails. The generator operates for the duration of the outage but is not meant to run continuously.

- Typical Run Time: Operates for the duration of a power outage, typically with a load factor of up to 70% of the nameplate rating over a 24-hour period. Some generators, like certain engine models like Cummins, can operate at an 85% load factor.

- Rating Example: A generator rated at 1,000 kW Standby can provide up to 1,000 kW during an outage but should not be expected to run continuously at this load.

2. Prime Power Rating

- Definition: The maximum power a generator can provide with a variable load for an unlimited number of hours per year.

- Usage: Used as the primary power source in places where utility power is unreliable or unavailable, such as in remote locations or construction sites.

- Load Factor: Typically allows a load factor of 70-80% of the rated power. It can handle variations in load over time.

- Rating Example: A generator rated at 1,000 kW Prime Power can continuously provide 1,000 kW as the main power source but with an average load of around 700-800 kW.

3. Continuous Power Rating

- Definition: The power a generator can provide continuously without any time limits under a constant load.

- Usage: Used for applications where the generator is expected to run at a constant load for long periods, such as in industrial plants or remote installations with no utility power.

- Load Factor: Designed for operation at 100% of the rated power, 24/7.

- Rating Example: A generator rated at 1,000 kW Continuous Power can run indefinitely at 1,000 kW.

4. Overload Capacity

- Definition: Some diesel generators also have a short-term overload capacity, which allows them to exceed their rated power output for a limited time.

- Usage: Used to accommodate sudden spikes in power demand.

- Typical Capacity: Often around 110% of the Prime Power rating for up to 1 hour in a 12-hour period.

All diesel generator set made by Hosem Power comply to ISO standards, and there are high-power rate engine like Cummins, Perkins, Deutz, Weichai, SDEC etc, welcome to contact us to learn more about our diesel generator set

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