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5.10 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 15/25/30/33kVA and approximately 11.5
amperes for the 50 kVA. 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 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 while the unit is maintained in a 75°F (24° C) ambient.
Rated Battery Voltages
15/25/30/33 50kVA
Model
Internal
Battery
Internal
Transformer
Internal
Battery
Internal
Transformer
V float
324.0 VDC 324.0 VDC 324.0 VDC
V min
252 VDC 252 VDC 252 VDC
I charge
4.0 A 10.0 A 11.5 Amps