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6.7 Battery

Recharging

The illustration below shows a graphical representation of the UPS battery recharge

process after a full discharge.

The recharge process usually consists of three steps. During the first step, the charging
current is maintained at approximately 4.0 amperes for the 15/25/30 kVA with internal
batteries, 10.0 amperes for the 15/25/30 kVA with internal transformer and approximately
11.5 amperes for all 50 kVA models. This current is the maximum value that can be used
to charge the batteries (for minimal recharge time) while assuring safety and long battery
life. In the second step, constant-voltage control starts and current gradually decreases as
the batteries charge to their normal fully charged state. In the third step, a slight "trickle"
current continues to flow into the batteries to keep them fully charged and "floating" at the
normal DC Voltage level. A full recharge usually requires approximately 24-72 hours (90%
recharge in 10 X discharge time) after a complete discharge.

The following chart shows the rated maximum and minimum battery voltages, and the

charge current for each of the sizes while the unit is maintained in a 75 °F (24

°C) ambient.

Rated Battery Voltages

15/25/30 kVA

50kVA

Model

Internal

Battery

Internal

Transformer

Internal

Battery

Internal

Transformer

V float

324.0 VDC

324 VDC

V min

216 VDC

I charge

4.0 A

10.0 A

11.5 Amps

4200FA CT/XT User’s Manual