When purchasing diesel generator sets, full consideration should be given to the comprehensive performance and economic indicators of the diesel generator sets, the supplier's professionalism, geographical location, and actual professional level, as well as whether the supplier has after-sales service methods, such as repair vehicles and specialized tools. Then consider whether the selected unit power matches the power of the electrical load. Generally, it is better to select the unit power based on the rated power of the unit x0.8=the power of the electrical equipment. If there are large and medium-sized motors, it is also necessary to consider a starting current of 2-5 times. If the unit is mainly used for charging UPS, a professional consultation must be conducted based on the actual situation of UPS before determining the rated power of the generator.

Before selecting a diesel generator set, it is necessary to clarify the relationship between the five major powers in the parameters of the diesel generator set, namely apparent power, active power, rated power, * high power, and economic power. Many people may confuse their definitions. Here, I will help you sort them out for your understanding.
(1) The unit of apparent power is KVA, which is commonly used in China to express the capacity of transformers and UPS.
(2) The active power is 0.8 times the apparent power, in kilowatts. It is commonly used in power generation and consumption equipment in China.
(3) The rated power of a diesel generator set refers to the power that can operate continuously for 12 hours.
(4) The unit power is 1.1 times the rated power, but only one hour of use is allowed within 12 hours.
(5) The economic power is 0.75 times the rated power, which is the output power of a diesel generator set that can operate for a long time without time constraints. When operating at this power, the fuel consumption is low and the failure rate is low.


When choosing a diesel generator set, you can calculate the size of your required load in advance, and then choose the generator set based on the load size.
1. Firstly, it is necessary to distinguish the difference between the apparent power and effective power of diesel generator sets. The relationship between them is 1KVA=0.8KW. Imported units generally use KVA to represent the power unit, while domestic electrical equipment generally uses KW. Therefore, when calculating power, KVA should be discounted by 80% to convert it into KW.
2. Secondly, it is necessary to determine the rated power and high power of the diesel generator set to be selected.
3. 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 can be divided into direct starting, 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 also reach 6 times the rated power; The starting current of the latter is about 3 times, and the instantaneous power is also 3 times the rated power. Therefore, when selecting the power of a generator set, in addition to considering the sum of the power of all electrical appliances, it is also necessary to consider the starting power of each electrical appliance.

Reminder: In general, 0.8 times the output power of a diesel generator set is equal to the actual output power of the generator set. This not only ensures that the generator set does not overload, but also ensures that the generator set does not operate at low load for a long time, thereby extending the service life of the diesel generator set. In addition, the diesel generator set belongs to non continuous operation power generation