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Battery Recharging
the illustration below shows a graphical representation of the UpS battery recharge process after a full
discharge.
CURRENT
I
CHARGE
0
The recharge process usually consists of three periods. During the first 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 flow into the batteries to keep
them fully charged and floating 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.
Model
3.6 kVA
10 kVA
14 kVA
18 kVA
22 kVA
28
VOLTAGE
CHARGING
CURRENT
V
MAx
V
MIN
DISCHARGE
SHUT-OFF
POINT
0
PERIOD 1
RATED BATTERY VOLTAGES
Vmax
163 V
6 kVA
245.7 V
8 kVA
327 V
327 V
327 V
327 V
327 V
BATTERY
CHARGE
VOLTAGE
FULLY
CHARGED
PERIOD 2
PERIOD 3
Vmin
Icharge
114 V
1.0 A
170 V
1.0 A
227 V
1.0 A
227 V
1.0 A
227 V
1.0 A
227 V
1.0 A
227 V
1.0 A
1600Xp Series installation and operation manual
TIME
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