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1600XP Series Installation and Operation Manual
10.7 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 periods. During the rst period, the current is maintained
at approximately 1 ampere. This current limit 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 period,
constant-voltage control starts and current gradually decreases as the batteries charge to their normal
fully charged state. In the third period, a slight trickle current continues to ow into the batteries to keep
them fully charged and oating at the normal Vdc level. A full recharge usually requires 24 hours (90%
recharge in 12 hours) after a complete discharge.
The following chart shows the rated maximum and minimum battery voltages and the charge current for
each of the sizes.
RATED BATTERY VOLTAGES
Model Vmax Vmin Icharge
3.6 kVA 163 V 114 V 1.0 A
6 kVA 245.7 V 170 V 1.0 A
8 kVA 327 V 227 V 1.0 A
10 kVA 327 V 227 V 1.0 A
14 kVA 327 V 227 V 1.0 A
18 kVA 327 V 227 V 1.0 A
22 kVA 327 V 227 V 1.0 A
BATTERY
CHARGE
VOLTAGE
CURRENT VOLTAGE
CHARGING
CURRENT
I
CHARGE
V
MAX
V
MIN
DISCHARGE
SHUT-OFF
POINT
PERIOD 1
PERIOD 2
PERIOD 3
TIME
FULLY
CHARGED
0 0