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5.0 Operating the UPS (Cont'd)
5.6 Battery Recharging
The graph below shows the typical voltage requirements for recharging the UPS unit's
batteries.
Model Vmax. Vmin. Charge
600 VA 68.2 48.0 0.4 (A)
800 VA 68.2 48.0 0.4 (A)
1000 VA 68.2 48.0 0.4 (A)
Rated battery voltages
Period 1
Period 2 Period 3
Time
Current
Voltage
Vmax.
Vmin.
Battery
charge
voltage
Fully
charged
Discharge
shut-off point
Charging
current
0.4 amp (A)
0
0
The recharge process usually consists of three periods. During the first period, the
current is maintained at approximately 0.4 amperes. In the second period, the constant-
voltage control starts and the current gradually decreases as the batteries continue to
charge. In the third period, a slight current flows into the batteries to keep them fully
charged. After a complete discharge, a full recharge usually requires 24 hours (90%
recharge in 8 hours).
The chart depicted below shows the rated maximum and minimum battery voltages,
and the charge current for each of the sizes.