1 PRODUCT
FUNCTION
The BCDC1240-LV is a multi stage, 12V, 40A, DC-DC battery charger that operates from
an input of either 12V nominal or a 12V nominal solar panel input. The input voltage of
the BCDC1240-LV 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 BCDC1240-LV is also designed to isolate the main battery
from the auxiliary battery, to avoid over-discharging the main battery and operate with
variable voltage alternators
1.1 Alternator
Input
To select the Alternator charging mode the BLUE ‘Source Select’ wire must be
connected to Vehicle Ignition.
The output battery will only be charged when the alternator is running, and the
vehicle ignition is ON, guaranteeing that the charger will not drain the input battery.
1.2 Solar
Input
The BCDC1240-LV 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.
1.3 Charging
Algorithm
When the BCDC1240-LV is turned on, it will move into the bulk charging stage
called Boost stage. Boost stage maintains a constant current until the battery
voltage reaches its set point. The current in Boost stage may vary during operation
in order to maintain safe operating temperature, or to limit the difference between
input and output voltage.
The charger will then move to Absorption stage. This stage maintains a constant
voltage level until the battery is full, after which the charger will enter fl oat stage.
Float stage maintains 13.3V on the output battery, keeping the battery topped
up. This counteracts the battery’s self discharging. When a load applied to the
battery causes it to lose charge, the charger will move back into Boost.
3
Содержание BCDC1240-LV
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