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. [BULK mode] 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:
Bulk LED flashes slow
If at the start of charging, the battery voltage is less than 21V, the bulk charge current is reduce to half of what the charging
current selector is set at, until the battery voltage rises to 24V. This soft start charging mode will repeatedly check the voltage
every 10 minutes until the battery voltage rises to 24V. If the battery voltage cannot reach 24V after 4 hours, unit will go into
fault mode and output is shut off. If this happens it is advisable to disconnect any active heavy load on the battery and check the
chargers output current setting. To reset the charger; switch it off for longer than 30seconds, then back on.
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. [ABSORPTION mode] Constant voltage charging, Absorption LED is ON.
When the battery voltage reaches the selected Absorption voltage level.(Battery select Switch 4).
The charging mode switches to Constant voltage charging (Absorption stage). Charging current will now 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. [FLOAT mode] 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. [STANDBY mode] Constant voltage charging, Float LED is ON.
Note; Only applies to certain Battery types [See Specs section. O].
In Standby stage, The charging voltage at this mode will be 4% less than the standard Float voltage.
This lower charging voltage level reduces drying out of electrolyte liquid & helps to prolong the life of an inactive battery.
New Cycle Charge every 21 days
The Charger will automatically 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 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 25V for approx. 10
minutes in Float or Standby mode: The charger will start a new cycle of charging.