Selection and configuration of UPS battery

1、 Basic technical indicators of UPS battery: ① valve controlled sealed lead-acid battery: each UPS is connected to one group. ② Floating charge voltage tolerance: 1%. ③ Floating charge voltage: 2.23-2.27v/cell. ④ Equalizing voltage: 2.3-2.4v/unit. ⑤ End discharge voltage: 1.67-1.70v/unit. ⑥ Influence of temperature on battery life: under floating charge operation at 25 ℃, the theoretical life is no less than 10 years.

1、 Basic technical indicators of UPS battery: ① valve controlled sealed lead-acid battery: each UPS is connected to one group. ② Floating charge voltage tolerance: 1%. ③ Floating charge voltage: 2.23-2.27v/cell. ④ Equalizing voltage: 2.3-2.4v/unit. ⑤ End discharge voltage: 1.67-1.70v/unit. ⑥ Influence of temperature on battery life: under floating charge operation at 25 ℃, the theoretical life is no less than 10 years.

2. Calculation of UPS battery capacity

2.1. Maximum discharge current of UPS battery I

I=S×COSφ/η×Ei

Where: s is the nominal output power of UPS;

Cos φ is the load power factor, generally 0.8;

η is the efficiency of the inverter, generally 0.8;

EI is the end discharge voltage of UPS battery.

2.2. Battery backup time t battery backup time t is determined according to the needs of users, and valve controlled lead-acid battery is mostly used in small and medium ups. The price is expensive. Generally, the full load working time is 10min, 15min or 30min.

2.3. After calculating the maximum discharge current of UPS battery capacity C, calculate the standard battery capacity according to the load nature and the backup time of UPS required by the user: (C = it).