I phase: Charging with constant current
Depending on the battery charge state, the battery is charged with maximum
charging current to store as much energy as possible in the battery. After
reaching the set main charging voltage, the charger switches to the next char-
ging phase (U
1
). If the set main voltage is not reached within max. 10 h, the
device enters the U
2
phase and reports an error.
NOTE!
Deep discharged batteries with a voltage below 6 V are not charged
for safety reasons.
U1 phase: Main charging with constant voltage
In the main charging phase, the voltage is kept at a constant value. As the bat-
tery increasingly charges, the current decreases continuously and approaches
a lower limit.
Battery
Type
Main charge voltage
Gel/AGM battery
12 V
14.4 V
Wet cell battery (stand-
ard)
12 V
14.2 V
Gel/AGM battery
24 V
28.8 V
Wet cell battery (stand-
ard)
24 V
28.4 V
U2 phase: Trickle charge with reduced voltage
In this phase, the charging voltage is reduced in order to maintain the battery
charge for an unlimited period and counteract self-discharge. Additionally
connected consumers are supplied via the charger in this phase without load-
ing the battery.
Battery
Type
Charge voltage
Gel/AGM battery
12 V
13.8 V
Wet cell battery (stand-
ard)
12 V
13.6 V
Gel/AGM battery
24 V
27.6 V
Wet cell battery (stand-
ard)
24 V
27.0 V
12
LEAB Automotive GmbH
Thorshammer 6
24866 Busdorf
6 Charging Characteristics
LEAB Automotive GmbH
