F. Normal 4-Stage (IUoU) Charging Operation
The 4-stage IUOU charge algorithm ensures fast, complete and at the same time gentle charging of the lead acid battery.
Charging Profile
Stage 1.
THE I-PHASE. The constant current charging, Bulk LED is ON.
Normally the battery is charged at constant maximum current until it rises to the selected Absorption voltage level.
The charging voltage changes with the battery voltage.
Soft-Start Bulk Charging:
If at the initial bulk charging, the battery voltage is at less than 12.3V, the bulk charge current is reduced to half of the maximum
until battery voltage rises to 12.8V. This soft start charging is set for 10 minutes and will repeat until battery voltage rises to
12.8V. At the end of 2 hours battery voltage cannot reach 12.8V, alarm will sound and output is cut off.
Remark:
If the battery keeps the charger at Bulk mode for 12 hours, the charger will automatically switch to Float mode.
Stage 2.
THE UO-PHASE. The constant voltage charging, Absorption LED is ON.
Battery Type Selection: Gel P-1: 14.1V / Gel P-2: 14.3V/ AGM: 14.3V / LiFePO4: 14.6V/ Wet: 14.4V / Calcium: 15.1V
When the battery voltage reaches the selected Absorption voltage level, the charging switches to Constant voltage charging
(Absorption stage). Charging current will decrease gradually until a pre-set value at which the charger then automatically
switches to Float Stage. The max. Absorption time is also controlled by the time in Bulk charge , and battery type selected .
Stage 3.
THE UO-PHASE. The constant voltage charging, Float LED is ON.
In Float stage, the battery is full and only takes in the amount of current necessary for maintaining the capacity.
The float voltage is preset according to the type of battery selected by the user. Battery Select Switch (4).
If the charger stays in this mode with charging current less than 5A for over 72 hours. Then the charger will automatically
Switch into the Standby mode.
Stage 4.
THE UO-PHASE. The constant voltage charging, Float LED is ON.
In Standby stage, The charging voltage at this mode will be 4% less than the Float voltage only for maintaining the capacity.
This lower charging voltage level reduces drying out of electrolyte liquid, prolongs the life of an inactive battery.
New Cycle Charge every 21 days
The Charger will start a new charging cycle of Bulk to Absorption to Float every 21 days in either standby or float mode. This
new cycle of charging will refresh the battery to prevent separation of the electrolyte & keep the electrode plates in good
condition. This automatic New Cycle charge after 21 days is designed to keep the battery in good working condition during long
periods of storage of the Caravan/RV or back up battery applications.
Remark:
Charger can give out full selected max current in Float or Standby mode. If battery voltage drops to 12.5V for approx. 10
minutes in Float or Standby mode: The charger will start a new cycle of charging.
