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Three-Stage Charging
Figure 17 Typical Multiple Battery Installation with one of the
banks of a different chemistry
LFP
Flooded
34
Three-Stage Charging
The three-stage charging mode employs the following sequence:
Bulk, Absorption, and Float. During the Bulk stage the
batteries are accepting a constant maximum current. In the
Absorption stage, the battery voltage is held constant and the
current declines. Finally, in the Float stage, the charger continues
to provide voltage at a lower level to maintain the battery in a fully
charged state. If there is no load on the battery, it will typically
draw very little current. The charger, however, is able to provide
current to its full rating to power auxiliary DC loads on the battery.
The charger will restart the charging cycle in the Bulk stage if the
lowest battery voltage of the banks drops below 12.5 VZ for 15
minutes. After 21 days, the charger will automatically restart
charging in order to refresh the batteries.
Figure 18 Three-Stage Charging Process
lout < 10% lrating
for 1 minute
Battery Voltage
Vbat < 12.5 V
for 15 minutes
Charge
start
BULK
ABS
Total ABS timeout
FLOAT timeout
Start of
max 8 hrs
max 21 days
charging cycle
XPLORE 120/12 Battery Charger Owner's Guide
FLOAT
Time
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