Why Can't UPS Power Supplies Carry Inductive Loads?

Inductive load equipment is not recommended for conventional UPS power supplies because inductive loads have large temporary starting currents and can easily cause instantaneous overload of the UPS. Therefore, it is recommended that if an inductive load is required, its power can be amplified 3-5 times. Only in this way can the UPS work properly.

Because driving inductive loads will generate back electromotive force, equipment with large activation current is not suitable for UPS. Due to its large instantaneous starting current, if the UPS capacity is insufficient, it is easy to cause instantaneous overload, so equipment with large capacity must be selected.

The UPS capacity should not be too large compared to the load to avoid over-light load operation. Although running at too light a load can help reduce the probability of damage to the inverter, if the battery discharge current is too small and the discharge time is too long, the battery pack will be deeply discharged and permanently damaged.

The UPS power supply capacity should not be too small to avoid heavy load operation for a long time. Although this can save some investment, because the inverter is under heavy load operation, the output waveform will be distorted and the output voltage amplitude will jitter too much.

This can not only provide high-quality power to the load, but also easily cause damage to the UPS inverter, so even from an economic point of view, the gain outweighs the loss. Currently, according to some UPS manufacturers, the load of a UPS power supply should not exceed 80% of its rated capacity in the long term.