The rated output power is an important parameter that indicates how much power a product can drive a load. It varies with the change of the load power factor. For example, a 1kVA UPS may not necessarily be able to drive a 1kVA load. In order to extend the service life of the UPS, it should not be operated at full load for a long time.
Backup UPS generally selects a load capacity of 60% -70% of the rated power, while online UPS generally selects a load capacity of 70% -80% of the rated power. It is also not advisable to operate under excessive light load for a long time.
UPS should not be fully loaded or excessively lightly loaded. Each unit is labeled with its rated power. Generally, online UPS should not exceed 80% of its rated power load. Therefore, it is best not to use it at its rated power. Prolonged use at full load can cause overheating of the inverter and rectifier, affecting its service life.
Similarly, it is not advisable to operate under excessive light load, as it may cause deep discharge of the battery during power outages and significantly reduce the battery’s lifespan.
For certain special loads, strong surge currents are generated during start-up or operation, causing the load capacity to instantly increase by several times (sometimes up to six times). For this type of load, the margin should be further increased on the basis of the normal capacity margin ratio.
The correct capacity ratio has a significant impact on the normal and stable operation of UPS and its service life. UPS systems that frequently operate under full load or overload conditions have a much higher chance of failure than those with the correct capacity ratio.