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Two-Stage Charging
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Two-Stage Charging
The two-stage charging mode employs the following sequence:
Bulk and Absorption . It runs similar to the three-stage sequence
except that there is no float stage; after the absorption stage the
charger stops providing current to the battery and the charger
output drops to 9 V. In this manner, DC loads draw power supplied
by batteries and the charger enters a “rest or standby stage.”
Like the three-stage sequence, the charger will restart the
charging cycle in the Bulk stage if the lowest battery voltage of the
banks drops below 12.5 V (12 Vdc chargers) for 15 minutes. After
21 days, the charger will automatically restart charging in order to
refresh the batteries.
Figure 16 Two-Stage Charging Process
Battery Voltage
Time
9V
ABS
CV
REST
(Standby)
ABS CV timeout
max 5 hrs
REST (Standby)
timeout max 7 days
BULK
GO TO BULK when
Vbat < 12.5 V for
15 minutes
Vbat = Vabs
for 1 minute
for 1 minute
lout < 10% lrating
Charge
start
Start of
charging cycle
Float Only Charging
The float-only charging mode maintains a maximum charging
voltage equal to a preset float voltage. A float stage is applied
steadily to the battery.