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Introduction of Generator Output Power

Jun. 16, 2022

Today, we will briefly introduce the content of the generator output power and how to correctly select the generator power.


Continuous Power (COP) is defined as the maximum power that the generator can continuously supply to a constant load for unrestricted operating hours per year under agreed operating conditions and with maintenance performed at the manufacturer's maintenance intervals and methods.


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Basic Power (PRP) is defined as the maximum power at which a generator can continuously supply variable loads for unrestricted hours of operation under agreed operating conditions and with maintenance performed at the manufacturer's maintenance intervals and methods.


The allowable average output power (Ppp) within a 24h period should not be greater than 70% of the PRP, unless otherwise specified by the manufacturer of the reciprocating internal combustion (RIC) engine. (Note: When the allowable Ppp is required to be greater than the specified value, the continuous power (COP) can be used). When determining the actual average output power Ppa of a changing power sequence, the power less than 30% PRP shall be regarded as 30%, and the downtime shall not be counted.


The actual average power (Ppa) is calculated as follows:


Limited-time operating power (LTP) is defined as: under the agreed operating conditions and maintenance intervals and methods specified by the manufacturer, the generator can supply a maximum power of 500h (hours) per year.


Emergency Standby Power (ESP) is defined as: Under agreed operating conditions and maintenance performed according to the maintenance intervals and methods specified by the manufacturer, when the public grid fails or under test conditions, the generator runs for a certain period of time for 200h per year. Maximum power in the variable power series. The allowable average output power (Ppa) in a 24h operating cycle should not be greater than 70% of ESP, unless otherwise specified by the manufacturer of the reciprocating internal combustion (RIC) engine. The actual average output power (Ppa) should be lower than or equal to the average allowable output power (Ppp) that defines the ESP.


When determining the actual average output power (Ppa) of a variable power sequence, power less than 30% ESP shall be considered as 30%, and downtime shall not be counted. Regarding the generator power standard, the editor will share so much today. Secondly, when purchasing a generator, the choice of generator power is also an important content, so how to choose the generator power size.


First of all, it is necessary to distinguish the difference between the apparent power and the effective power of the generator. The relationship between them is 1KVA=0.8KW. Imported units are generally expressed in KVA, while domestic electrical equipment is generally expressed in KW, so When calculating power, KVA should be converted into KW by 20% off.


Secondly, it is necessary to determine the rated power and high power of the generator to be selected. In addition, determining the power of the generator set does not simply add up the power of all electrical appliances, but also needs to consider the starting method of the electrical appliances. The general starting methods are divided into direct starting and step-down starting or variable frequency starting. The former has a starting current of about 6 times the working current, and the instantaneous power will reach 6 times the rated power; the latter has a starting current of about 3 times, and the instantaneous power is also the rated power. 3 times. Therefore, when selecting the generator power, in addition to the sum of the power of all electrical appliances, it is also necessary to consider the starting power of each electrical appliance.


Starlight Power was founded in 1974 and is one of the earliest manufacturers of generators and diesel generator sets in China. If you want get more information, please feel free to send email to sales@dieselgeneratortech.com we will pay highly attention on your question.

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