intervolt DCC Pro Installation & Operation Manual page 40

In order to prevent further damage due to overcharging, the DCC Pro is
programmed for the safest option which is to reduce the voltage by switching
out of constant current mode into oat stage. There is also the possibility that a
heavy load permanently connected to the auxiliary battery is responsible for the
charging cycle to time out in boost stage before terminal voltage is achieved.
If this is the case the DCC will continue to monitor the voltage and if the voltage
drops below 12.0V again, the boost cycle will re-initiate and the whole process
will start over.
Absorption: The absorption stage, the next step in the charging cycle,
is initialised when the boost stage is completed. In absorption stage the charger
is operating in constant voltage (CV) mode and is also time limited. The time
is calculated from the boost cycle and is based on a maximum of four times the
actual boost time (subject to the battery type selected). As with the boost stage
the current is limited to 25 Amps. The absorption stage is completed or
terminated under the following conditions:
• the programmed time cycle has nished
(pre-determined by the battery type selected) ; or
• the charge current is reduced below 4 Amps
(approximately 15% of maximum charge current).
Float: The nal process in the charging cycle is the oat stage. In oat stage the
charger is operating in constant voltage (CV) mode. The oat voltage is
determined by the battery type selected in the initial set-up phase. The oat
stage is programmed to maintain and monitor the battery inde nitely and as
such, allows the auxiliary battery to be connected permanently without any risk
of overcharging. As with the boost and absorption stage the current is limited to
25 Amps.
CHARGING METHODS - Solar to Battery
It is important to note that solar power can only be utilised if it is required.
In other words, if the batteries are fully charged and there is no load on the
auxiliary battery, the power is therefore unusable. Accordingly the charging
power displayed on the remote display may read zero Watts so do not be
alarmed to see this result under these conditions. The solar charging method
operates in two di erent ways depending on the control mode selected -
voltage or ignition. These charging control modes are explained on page 6.
In voltage sense (default) mode the charging process will act according to the
condition at the time. There are three basic scenarios that dictate how the
charger operates in this mode, details as follows:
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