4
1
PRODUCT FUNCTION
The BCDC1212T is specifically designed for, but not limited to, applications where the input current
required to charge a trailer mounted auxiliary battery is drawn through the vehicle’s towing harnesses
and connectors. It limits the input current drawn to 12 A which provides for safe and reliable operation
when using towing harnesses, fuses and connectors that are suitably rated without the need to install
additional cables and connectors between the start battery / alternator and the BCDC1212T / auxiliary
battery.
The BCDC1212T is a three-stage, 12 V DC-DC battery charger that operates from an alternator input of
12 V or 24 V. The input voltage to the BCDC1212T can be above, below or equal to the output voltage
making it ideal for charging an auxiliary 12 V battery where the distance from the start battery or
alternator may cause a significant voltage drop. When connected to a 12 V alternator the BCDC1212T will
typically provide peak boost currents of 11 A, and 20 A when connected to a 24 V alternator (the peak
boost current however also depends on alternator voltage and input cable voltage drop).
The BCDC1212T isolates the start battery from the auxiliary battery, to avoid over-discharging the start
battery.
1.1
Display Panel
The front panel features 7 LEDs to display the charge profile and charge status.
FIGURE 1.1.1:
The BCDC1212T Front Panel
1.2
Charge Profile LEDs
The In-vehicle Battery Charger features 4 different charging profiles designed to suit your battery’s
charging requirements. It is recommended to refer to the charging specifications stated by the battery
manufacturer and the installation temperature chart below (Figure 1.2.1) before selecting the profile for
your installation.
The selected Charge Profile LED will be on solid when the unit is ON and charging. A flashing profile LED
indicates that the unit is in standby mode and NOT charging.
CAUTION
Check the manufacturer’s data for your battery and ensure that the ‘Maximum’ voltage of the profile you
select does not exceed the manufacturer’s recommended maximum charging voltage. If the ‘Maximum’
voltage is too high for your battery type, please select another charging profile.
