How to calculate the battery solution for the UPS

March 3, 2026

For Example:

3KVA UPS 3000W backup 30min :

1.KVA*PFC=O/P P

3000*0.7=2100W(You can find this

on the catalogue capacity column)

1. Output P/DC=I

2100W/ 96VDC=21.875(You can find

the DC on the battery voltage column on the catalogue)

2. I/C=AH

21.875/0.92=23.77AH(You can check

the battery C on the bellow diagram)

So must 8pcs 12V/24AH battery.

This is on the full load mode. If you can use 30minutes on the

full load then on the half load can use about 60minutes.

Note:1.the first row is the backup time
2.The second row is the battery C
Calculate formula
KVA*PFC/VDC/Batter C=AH

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