52 ECTIVE CSI & SSI Series
Explanation of charging phases CSI- and SSI-series
The integrated charger as well as the MPPT-solar charge controller of the SSI-series
charge automatically with a 3-step IUoU charge characteristic which is described below.
Bulk (main charge): The battery is charged with permanent current and carefully rising
voltage until a predefined maximum voltage and until a stage of charging of 80% is
reached.
Absorption (remaining charge): The battery is charged with permanent current and
gradual decreasing current from 80% to 14,4 V* and a 100% capacity. The gradual
decreasing current ensures that the terminal voltage does not become too high during
the complete charging process.
FLOAT (charge maintenance): The battery status remains permanently at 13,8V*
without overcharging or damaging the battery. The voltage is permanently controlled in
this mode. If the voltage decreases to a predefined level, the battery is charged through
a pulse charge until reaching again 100%, so the charge status remains permanently
between 95% and 100%. This charging-cycle is repeated appropriately and influences
the lifetime of the battery in a positive way.
Stage Current Voltage Capacity
Bulk
(main charge)
100%
increasing up to
ca. 14,4 V*
up to 80%
Absorption
(remaining charge)
decreasing
increasing from
14,4 V*
80% to
100%
Float
(charge maintenance)
below 20% 13,6 V* 95% to 100%
* All voltage values refer to 12 V. For 24 V: double value. The voltage tolerance is ± 0.2 V.
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