For example, a 40KVAUPS with a DC voltage of 384V and 32 12V batteries per group. If a backup time of 2 hours is required, the calculated battery capacity is:

40000VA * 2H/(0.7 * 384V)=297AH

So choose 3 sets of 100AH batteries, totaling 96 cells.

The current of the battery pack is 40KVA/384V=104A, so a 50mm2 cable is selected for the battery connection.

Total number of batteries=(power/DC voltage * hours)/ampere hour per block * number of blocks per group

The power is the power of the UPS, and the DC voltage is the voltage required for UPS battery power supply. The DC voltage of UPS varies for different powers, and the minimum number of required batteries per group is the minimum number of blocks. Generally, when configuring batteries, it must be an integer multiple of the number of blocks per group. The common UPS DC voltage and the number of blocks per group are as follows (each battery block is calculated based on 12V):

For example, configuring a 5K8 hour delay UPS with a power of 5000, a DC voltage of 96V, 8 batteries per group, and 100AH batteries requires a total of 32 batteries (5000/96 * 8)/100 * 8=32

UPS stands for Uninterruptible Power System. The function is to provide an uninterrupted, stable, and reliable AC power supply. The reason why UPS can provide uninterrupted power supply in the event of a power outage in the city is that. It is the result of battery energy storage. The duration of power supply is determined by the capacity of the battery. The calculation method for UPS battery configuration in section 4.2 is introduced as follows:

A. The following factors affect standby time:

1. The total power of the load P (W), considering the power factor of the UPS, can be directly calculated in volt ampere (VA) units of P (total)

2. V low is the termination voltage (V) of the battery after discharge, with a 2V battery V low of 1.7V; 12V battery V low=10.2V

3. V float is the float charging voltage (V) of a battery, where V float for a 2V battery is 2.3V; 12V battery V float=13.8V

4. Kh is the battery capacity conversion factor (Ct/C10), with a 10Hr discharge rate of 1, a 5Hr discharge rate of 0.9, a 3Hr discharge rate of 0.75, and a 1Hr discharge rate of 0.6

5. I is the working current of the battery (A), T is the continuous discharge time (H), and V is the DC supply voltage of the UPS external battery (V)

B. Calculation method

1. The number of 12V individual batteries N: N=V ÷ 122V The number of individual batteries is 6N

2. Battery working current I: I=P total ÷ V

3. Actual battery capacity C: C=I × T ÷ Kh