6 | Product Function
4 PRODUCT FUNCTION
The BCDC1220(-IGN) is a three-stage, 12 V, 20 A DC-DC Battery Charger that operates from an
input of either 12 V or 24 V nominal. The input voltage of the BCDC1220 can be above, below or
equal to the output voltage, making it ideal for charging from a 24 V vehicle or charging an auxiliary
12 V battery where the distance from the main battery may cause a significant voltage drop. The
BCDC1220-IGN is also designed to isolate the main battery from the auxiliary battery, to avoid
over-discharging the main battery. The BCDC1220-IGN operates almost identically to the
BCDC1220 but is designed to operate from an ignition trigger to allow operation in vehicles with
Variable Voltage or Smart Alternators.
4.1 DISPLAY PANEL
The front panel features 6 LEDs that display the Charge Profile and Charge Status.
BCDC1220 Front Panel
When blinking, the flash duty-cycle of the 'Charge Status' LED will increase to reflect the amount of
current being supplied. If the LED is ON solid, the Unit is applying full power (e.g. 20 A).
Table 1: Charge Profile and Status
LED State Charge Profile LED Charge Status LED
Off Unit has no power Output is off
Blinking
Unit is in Standby
Unit is supplying power
On
Unit is on and can supply power
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