Power rating is one of the most critical factors when selecting a generator. Incorrectly determining the power level not only reduces operational efficiency but can also lead to waste, increase the risk of equipment damage, and affect the overall durability of the system.

However, many businesses still confuse the different types of power ratings when choosing a generator. In this article, Huu Toan will help you clearly understand the power ratings of a generator, providing you with the basis to select the right machine for your actual operational needs.

1. Prime Power (PRP)

This is defined as the maximum power that a generator is capable of delivering continuously, with an unlimited number of operating hours, under the maintenance intervals and procedures specified by the manufacturer. In practice, this power level is ideal for applications requiring a constant power source with a variable load over an extended period.

This power rating is the primary factor for selecting a generator in areas that require a continuous power supply for long durations, such as construction sites, factories, industrial parks, pumping stations, or areas without a stable grid connection.

Note: The average power output over a 24-hour period of operation should not exceed 70% of the PRP.

2. Emergency Standby Power (ESP)

ESP is the maximum power available for use in an emergency situation. It allows the generator to operate at its peak capacity for a short duration—a maximum of 1 hour in any 12-hour period—and does not permit any overload factor when operating at this level. This power rating is intended for emergency use only and is not suitable for regular or continuous operation.

Office buildings, data centers, hospitals, or retail chains—locations that require an emergency power source to maintain operations during a grid failure—should consider the standby power rating when selecting a generator.

Note:

• The average power output over a 24-hour period should not exceed 70% of the ESP.

• • Due to its time limitations, businesses should not rely solely on the standby power rating but must also consider the prime power rating and other factors.

3. Continuous Power (COP)

COP is the power level at which a generator can operate continuously for an unlimited number of hours. It is suitable for large-scale systems that require the generator to run 24/7 with a stable, continuous, and non-variable load. Unlike PRP, COP does not have a limitation on the 24-hour average load factor and has a better load-bearing capacity.

Continuous power is typically applied in systems with a relatively constant load, such as off-grid industrial zones, mining operations, water pumping stations, or independent power plants.

A clear understanding of these power ratings helps businesses select the appropriate generator, avoiding waste or power shortages that could disrupt operations. If you need more detailed advice on choosing a generator, please contact Huu Toan's 24/7 support team. With over 40 years of experience and a team of well-trained technicians, we will provide the most suitable solution for your business's power system.