Page 15
Enerdrive ePRO COMBI Owners Manual
5. CHARGER OPERATION
5.1 CHARGE PROGRAMS
All standard selectable charge programs (using DIP switches 5 and 6), perform a four stage IUoUoP charging
process comprising of a “Bulk”, an “Absorption”, a “Float” and a “Pulse” stage. The image below visualizes the
four stage charging process :
In the Bulk stage, the charger delivers full output current and typically returns approximately 80% of charge
back into the battery once the absorption voltage is reached. During this stage, the battery empty and battery
50% full indicators will be lit depending on the Bulk charge progress. When the absorption voltage has been
reached, the Absorption stage will be entered and the battery 80% full indicator will be lit. This stage will return
the final 20% of charge to the battery. The output voltage is kept at a constant level and the charge current
decreases as a function of the battery’s state of charge. When the charge current has dropped below a certain
value or when the maximum absorption timer has been expired, the Float stage will be entered. The battery
full Indicator will be lit and an acoustical message will sound, indicating that the battery is full. In this stage
