1 PRODUCT FUNCTION
The BCDC1225 is a multi stage, 12V, 25A, DC-DC battery charger that operates from an
input of either 12V or 24V nominal or a 12V nominal solar panel input. The input voltage
of the BCDC1225 can be above, below or equal to the output voltage making it ideal for
charging an auxiliary 12V battery where the distance from the main battery may cause a
signifi cant voltage drop. The BCDC1225 is also designed to isolate the main battery from
the auxiliary battery, to avoid over-discharging the main battery.
1.1 Alternator Input
To select the Alternator charging mode the BLUE ‘Source Select’ wire must be
connected to Input Positive.
The charger uses automatic voltage level sensing to determine the voltage level
of the input battery and alternator (12V or 24V), and whether or not the alternator
is running at any given time.
When the charger is connected to the input battery, it assumes that the input
power system is 12V. It remains in 12V mode until it measures an input voltage
over 17V for more than 2 seconds, in which case it switches and locks into 24V
mode. You can reset the unit to 12V mode by disconnecting the input battery for
1 minute.
Once the voltage level has been detected, the voltage sense is used to determine
when the alternator is running. The output battery will only be charged when
the alternator is running, guaranteeing that the charger will not drain the input
battery.
1.2 Solar Input
The BCDC1225 is also capable of charging the auxiliary 12V battery from a Solar
source, Solar charging mode is selected at time of installation. The unit will
accept an input directly from the solar panels and act as a MPPT Solar Regulator.
To select the Solar charging mode the BLUE ‘Source Select’ wire can either be left
disconnected or connected to GROUND.
NOTE: For Alternator Battery Charger installations this BLUE ‘Source Select’ wire
needs to be connected to the input battery positive terminal or to the ‘Battery Input
Positive’ wire.
3
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