Liebert UPS System - Manual (Page 107)

Chapter 9 Optional Parts
101
Chapter 9 Optional Parts
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.
Table 9-1 Battery capacity equipped for single UPS (Ah，25℃)
UPS
capacity
20kVA 30kVA 40kVA 60kVA
Discharging
current
50A 75A 100A 150A
Backup time Battery capacity（Ah）
15min 38 65 100 100
30min 65 65 100 150
1h 100 130 180 340
2h 150 200 340 420
3h 200 340 420 630
4h 250 340 510 680
5h 340 420 630 840
6h 340 510 680 1020
8h 420 630 840 1260