Generally, electrical loads will have their rated power or rated current and power factor parameters nominal, but due to significant differences in different types of loads, the total power cannot vary significantly,

Therefore, the total power cannot be simply added up, and its vector sum should be calculated. Fortunately, in general, the user load is mostly computer devices, with a power factor between 0.8 and 0.9,

Therefore, the rated power of each load can be accumulated to obtain the total power, while for individual other types of loads such as printers, their rated power can be multiplied by a factor based on the startup size and then calculated.

According to the total load capacity of UPS, it can generally be selected according to the following formula: UPS capacity>=load capacity ÷ 0.8, that is, the load capacity should be less than 80% of the rated capacity of UPS. Select 80% load

Mainly considering the impact current of load startup and the future expansion needs of users.