Items Unit
UPS Rated Power (kVA)
120
34-block battery
Rated battery discharge current at full load A 370
Reference rated current of BCB A 400
CSA of connection cable
mm
2
185
36-block battery
Rated battery discharge current at full load A 350
Reference rated current of BCB A 400
CSA of connection cable
mm
2
185
38-block battery
Rated battery discharge current at full load A 330
Reference rated current of BCB A 400
CSA of connection cable
mm
2
185
40-block battery
Rated battery discharge current at full load A 315
Reference rated current of BCB A 400
CSA of connection cable
mm
2
185
42-block battery
Rated battery discharge current at full load A 298
Reference rated current of BCB A 400
CSA of connection cable
mm
2
120
44-block battery
Rated battery discharge current at full load A 285
Reference rated current of BCB A 400
CSA of connection cable
mm
2
120
Table 7.5 BCB Rated Current and Battery Maximum Discharge Current at Full Load (Recommended) (continued)
NOTE: Current calculation is according to the DC/AC efficiency of 0.95 and EOD voltage of 1.63 V/cell.
NOTE: A DC breaker, with DC rated voltage of the breaker no less than the total voltage at the battery end is
recommended. See Figure 7.13 below.
Figure 7.13 Connections Between Battery, BCB and UPS (Battery Consisting of 30 to 44-block)
7 Battery Proprietary and Confidential ©2023 Vertiv Group Corp. 141
Vertiv™ Liebert® APM2 30 to 120 kVA Modular UPS User Manual
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