How to configure the battery capacity of UPS Uninterruptible Power Supply

How to configure the battery capacity of UPS Uninterruptible Power Supply

When we choose UPS uninterruptible power supply, we usually encounter how to configure the backup life time of load equipment, and how much UPS battery capacity can meet the need to continue to supply power when the power is cut for a long time.Correct selection of UPS battery capacity is very important for the normal operation of the whole uninterruptible power supply.If the battery capacity is too small, it will not only fail to meet the UPS backup time, but also seriously affect the performance and service life of the battery because the battery discharge rate is too large, and at the same time bring great hidden trouble to the stable operation of the system. We have summarized the UPS selection and configuration and battery calculation methods for your reference. Welcome to discuss with us.

Uninterruptible power supply UPS power configuration

General UPS uninterruptible power supply marked power for the apparent power, the unit is "VA", and electrical equipment marked power for active power, the unit is "W", there is a reactive power between them, that is, the apparent power = active power + reactive power, active power/apparent power = power factor.Backup, online interactive power factor between 0.5 ~ 0.7, online power factor in about 0.8 ~ 0.9, modular power factor in 0.99.

For example, the power of an electrical equipment is 500W, and the power capacity of on-line UPS is selected.

500÷0.8÷0.6=1042. It is more appropriate to choose a UPS power supply of about 1000VA through calculation.0.6 this number means that the load of UPS should not exceed 60% of the rated load, the load is too heavy or too light will shorten the service life of the battery, and then affect the service life of the entire UPS.

UPS battery capacity configuration

In the power interruption (power failure), UPS uninterruptible power supply can be uninterrupted power supply, because there is storage battery energy, the length of the power supply time is determined by the capacity of the battery size, so the battery configuration in the purchase of UPS uninterruptible power supply products is particularly important.

For example, the power of an electrical equipment is 4800W and the required discharge time is 0.5 hours. Please select 12V/16 =192V battery capacity.Then the battery capacity =4800×0.5÷192÷0.7= 17.8Ah, the use of 16 12V/ 18Ah battery can be.0.7 means that the design should be calculated according to discharge 70%, otherwise it will affect the service life of the battery.