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4: U1 phase (Trickle charging)
The U1 phase serves to maintain the battery capacity (100 %).The U1 phase runs at lowered charging voltage and vari-
able current. If DC loads are connected, they are powered by the device. Only if the power required exceeds the ca-
pacity of the battery, surplus power is provided by the battery. The battery is then discharged until the device re-en-
ters the I phase and charges the battery.
The corresponding LED flashes slow green.
5: U phase (Float)
In long-term mains operation, the U phase prevents further discharge of the battery (e.g., during long breaks in use,
seasonal operation or during winter storage), minimizes battery gassing and prevents plate corrosion.
The corresponding LED is lit green.
6: Reconditioning
Every 12 days, the charger switches back to the U0 phase for a short time (max. 85 min) in order torecondition the
battery. This prevents any fatigue phenomena such as sulfation or electrolyte stratification.
The corresponding LED flashes fast green.
LiFePo4 batteries
1: I phase (Constant current phase)
At the beginning of the charging process, the battery is charged with a constant current (100 % charge current) until
the battery voltage reaches 14 V. The charging current decreases when the battery has reached this charging level.
For safety reasons the I phase is terminated after a maximum of 18 h (in case of battery cell defects or similar)
The corresponding LED indicator of the battery that is charged flashes yellow.
2: U0 phase (Trickle charging)
Now the trickle charging process (U0 phase) begins, where the duration depends on the battery. The voltage re-
mains constant (U0). Then the main charging phase begins when the battery is fully charged.
Once the battery is completely charged, or the charging current is below 6 % of the rated charging current for
15 min, the U0 phase has finished.
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