Liebert UPS System user manual Battery, Capacity selection

Chapter 9 Optional Parts

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	20kVA	30kVA	40kVA	60kVA
capacity
Discharging	50A	75A	100A	150A
current
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

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