Chapter 9 Optional Parts; Battery; Capacity Selection - Liebert UPS System User Manual

9.1 Battery

9.1.1 Capacity selection

Calculate the discharging current according to rated load capacity and then select
the battery according to the current and the battery backup time required by user.
There are various specifications of battery, we recommend that 30 12V battery cells
should be connected in series to form a battery string. The capacity of battery cell
can be 38Ah, 65Ah and 100Ah.
Note
If the battery capacity exceeds 100Ah，the user should connect the battery of
same model and same capacity in parallel or use large capacity 2V battery to make
up the battery group.
The capacity data of battery string are listed in Table 9-2 and the capacity data are
selected according to rated load. Select the battery of 70%~100% rated capacity
according to the actual load and required backup time.
UPS
capacity
Discharging
current
Backup time
15min
30min

Chapter 9 Optional Parts

Chapter 9 Optional Parts
Table 9-1 Battery capacity equipped for single UPS (Ah ， 25 ℃ )
20kVA 30kVA
50A
38
65
1h 100
2h 150
3h 200
4h 250
5h 340
6h 340
8h 420
40kVA
75A 100A
Battery capacity （ Ah ）
65 100
65 100
130 180
200 340
340 420
340 510
420 630
510 680
630 840
101
60kVA
150A
100
150
340
420
630
680
840
1020
1260