Why should power be reserved for power supply selection? General practical knowledge in the industry

In the construction of various communication terminals, outdoor equipment, industrial electronic control and energy 

storage power supply system, power supply selection is a crucial link. Many purchasing and engineering personnel 

are used to selecting the matching power supply according to the rated power marked by the electrical equipment, 

thinking that the parameters are equivalent and stable operation can be achieved. However, in actual use, problems 

such as hot power supply, protection shutdown and abnormal equipment operation frequently occur, which mostly 

ignores the industry rules of power reserve.

Almost all electrical equipment will generate surge current much larger than the rated value at the moment of start-up. 

Power supply equipment such as inverter power supply, DC converter and switching power supply need to undertake 

instantaneous power peak. If the power supply is just equal to the load, it will be in a state of full load or even overload 

at the start-up stage, which will not only reduce the power supply efficiency in the long run, but also accelerate the 

aging of internal components.

In addition to the starting shock, the use environment will also affect the actual output capacity of the power supply. 

In the environment of high temperature, airtight and outdoor exposure, the heat dissipation condition of power supply 

becomes worse, and the effective output power will naturally decay. At the same time, some projects will add small 

loads in the later stage. If there is no reserved space in the early stage, the whole set of power supply can only be 

replaced in the subsequent expansion of equipment, which will increase the extra cost.

In the power supply industry, a mature reference standard for selection has already been formed. For conventional 

civil and communication loads, it is recommended to reserve 20%~30% power margin; For industrial equipment and 

power loads that frequently start and stop, it is suggested to increase the power reserve ratio to 30%~50%. Sufficient 

redundant space can make the power supply work in the easy load range for a long time, and the operation is more 

stable, and the failure rate will be greatly reduced.

Baoweite's full range of inverter power supply, DC converter and modular switching power supply fully consider load 

impact and environmental loss in the design stage, and have good overload capability. Combined with the actual load 

of the project, the power is reasonably reserved, and then combined with the standby power supply system, so that 

the whole power supply scheme can give consideration to stability and expansibility.

If you need type selection and transformation, you can consult Baoweite for the scheme. Thank you for browsing. 

You can collect official website of Shenzhen Baoweite Power Supply Co., Ltd.