The UPS manufacturer will also recommend the battery be discharged to a specific end voltage per cell. For a 60
cell lead acid battery, this will normally be 105V per bank or 1.75 volts/cell.
Utilizing the battery manufacturer’s supplied information, such as that in Figure 2 for this 20 kVA UPS, 60 cells of
either 3CX-11 are required which will supply 19.4 kW (0.324kW x 60 cells) for 30 minutes.