30 Truecharge2 Series Battery Charger Owner’s Guide
Installing Batteries
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 (12 Vdc chargers) or 18V
(24 Vdc chargers). 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 three banks drops below 12.5 V (12 Vdc
chargers) or 25 V (24 Vdc chargers) for 15 minutes. After seven days, the
charger will automatically restart charging in order to refresh the batteries.
Figure 10
Two-Stage Charging Process
Battery Voltage
Time
ABS
CC
ABS
CV
REST
(Standby)
ABS CV timeout
max 5 hrs
REST (Standby)
timeout max 7 days
Total ABS timeout
max 8 hrs
BULK
Vgas voltage
Vbat = Vgas
for 1 minute
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
TC2 204060 Series BattChg Owners Guide.book Page 30 Friday, July 8, 2011 11:44 AM
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