Toshiba 1600 Series - Battery Recharging Process; Graphical Battery Recharge Representation; Rated Battery Voltages and Charge Current

TOSHIBA
21
Model Vmax Vmin Icharge
2.4 kVA 163.8 116.7 1.0 amp
3.6 kVA 163.8 116.7 1.0 amp
6.0 kVA 245.7 175 1.0 amp
8.0 kVA 163.8 116.7 1.0 amp
Operating the UPS
Battery Recharging
The illustration below shows a graphical representation of the UPS battery recharge
process after a full discharge.
Period 1
Period 2 Period 3
current
Battery
charge
voltage
Fully
charged
Charging
0
0
Discharge
shut-off point
Vmax
Vmin
Time
Voltage Current
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 10 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
Icharge
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