Two-Stage Charging - Xantrex TC1012 Owner's Manual

Operation

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 voltage and
current to the battery and 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 12.5V (12 V chargers) or
25 V (24 V chargers) for 15 minutes. After 21 days, the
charger will automatically restart charging in order to refresh
the batteries.
Battery Voltage
Vgas voltage
Charge
start
Figure 2-3 Two-Stage Charging Process
2–4
Vbat = Vabs
for 1 minute
Vbat = Vgas
for 1 minute
ABS
BULK
CC
Start of
charging cycle
lout < 10% lrating
GO TO BULK when
Vbat < 12.5 V for
15 minutes
ABS
CV
ABS CV timeout
max 5 hrs
REST (Standby)
timeout max 21 days
Total ABS timeout
max 8 hrs
REST
(Standby)
975-0401-01-01
Time