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THE BCDC1225-XXX & BCDC1240-XXX
The BCDC1225-XXX / BCDC1240-XXX In-vehicle Battery Chargers feature technology
designed to charge your auxiliary batteries to 100%, regardless of their type or size.
Units that feature a Yellow wire include a Maximum Power Point Tracking (MPPT) solar
regulator. These units always take as much power from the unregulated Solar input as possible
before supplementing from Vehicle power input, up to the maximum rated power.
All In-vehicle Battery Chargers are suitable for all common types of automotive lead acid
batteries and LiFePO lithium type batteries.
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WARNING & SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS - THIS MANUAL CONTAINS IMPORTANT SAFETY INSTRUCTIONS FOR THE BCDC1225-
XXX/BCDC1240-XXX BATTERY CHARGER RANGE.
DO NOT OPERATE THE BATTERY CHARGER UNLESS YOU HAVE READ AND UNDERSTOOD THIS MANUAL AND
THE CHARGER IS INSTALLED AS PER THESE INSTALLATION INSTRUCTIONS. REDARC RECOMMENDS THAT THE
CHARGER BE INSTALLED BY A SUITABLY QUALIFIED PERSON.
1. If you need to replace your auxiliary battery, 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.
2. When using the Battery Charger to charge a Lithium Iron Phosphate battery, only batteries that feature an inbuilt
battery management system featuring inbuilt under and over voltage protection and cell balancing are suitable.
SPECIFICATIONS
Part Number
Continuous Current Rating
Vehicle Input Fuse Rating
REDARC FK40 recommended
Output Fuse Rating
Output Power
Vehicle Input Voltage Range
*1
Solar Input Voltage Range
*1
Output Battery Type Standard Lead Acid, Calcium content, Gel, AGM or LiFePO
Charging Profile
- Maximum Voltage 14.6V
*1
- Float Voltage
*1
No Load Current
Standby Current
Operating Temperature
Minimum O/P Battery Volts
Weight
Dimensions
Warranty
Standards
*1 Voltages Specified are ±100mV
PRODUCT FUNCTION
The BCDC1225-XXX / BCDC1240-XXX is a three-stage, 12V DC-DC battery charger
that operates from an alternator input of 12V or 24V and, if your unit features a
YELLOW wire, an unregulated 12V nominal solar panel input. The input voltage of the
BCDC1225-XXX / BCDC1240-XXX 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 significant voltage drop. The BCDC1225-XXX / BCDC1240-XXX
is also designed to isolate the main battery from the auxiliary battery, to avoid over-
discharging the main battery.
Display Panel
The front panel features 7 LEDs to display the charge profile and charge status.
Figure 1 - The BCDC1225-XXX and BCDC1240-XXX Variant Front Panels
Charge Profile LEDs
In-vehicle Battery Chargers feature 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 2) before selecting the profile for your installation.
The selected 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.
Cabin
Maximum Battery
Install
Voltage Specification
14.6
15.0
15.3
14.5 (LiFePO )
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Figure 2 - Charge Profile Selection
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.
BCDC1225-XXX BCDC1240-XXX
25A 40A
40A (Not Supplied) 60A (Not supplied)
REDARC FK60 recommended
375W 600W
9-32V
9-32V (unregulated only)
A B C
15.0V 15.3V
13.3V
<100mA
<8mA
-15°C to 80°C / 5°F to 175°F
0.1V
0.9kg / 2lbs
165x120x37mm
2 years
ECE Reg. 10
Auxiliary Battery Location
Engine Bay
Install
A A
B A
C B
Li Not Recommended
PRODUCT FUNCTION
Charge Status LEDs
The Charge Status LEDs indicate to the user which inputs are available and what stage
of the charge process is currently in.
Solar & Vehicle LEDs
Units with a YELLOW wire feature an In-built MPPT solar regulator.
The Solar and Vehicle LEDs will be ON when the input is available and in use and OFF
when the input is not available or not in use.
If both LEDs are ON, both input sources are available and in use.
Units with the MPPT Regulator use Green Power Priority technology. This means
the unit will always supply as much power as possible from the Solar input before
supplementing this with power from the Vehicle input, to the maximum output of the
unit or required by the battery at the time.
Stage LED
The Stage LED indicates the charge profile stage. With any profile selected the
charger will output a 3-Stage type charging profile with Boost, Absorption and Float
Stages.
Figure 3 outlines the LED sequences which indicate these stages and Figure 4
explains the Charging Process.
LED Sequence
Continuous
Continuous
type only
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Li
14.5V
2 Seconds
13.6V
2 Seconds
PRODUCT FUNCTION
Charging Process
Boost
Voltage
Current
When the Charger is turned on, it will move into the Boost stage. The Boost stage
maintains a constant current until the battery voltage reaches its Absorption Voltage.
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 voltages.
The Charger will then move to Absorption stage which maintains a constant voltage
level for a predetermined period of time or until the current being drawn by the output
battery drops to less than 4A for 30 seconds; after which the Charger will enter Float
stage.
Float stage maintains 13.3V (13.6V for LiFePO
battery topped up. This counteracts the battery's self discharging or loads applied
to the battery. When the battery loses charge, the Charger will move back into the
Boost stage.
The unit features a battery test mode which occurs every 100 seconds. The test
mode is designed to both test that the input conditions are still met and check for the
presence of a battery on the output of the unit. This feature is designed to protect the
vehicle battery from over discharge and protect the vehicle and wiring in the event of
damage to the output connection. During low output current situations (when in Float
mode for example) this battery test may take up to 60 seconds to complete.
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Profile Stage (Lithium)
OFF / No Output
Boost (Constant Current)
Absorption (Constant Voltage)
Float
Figure 3 - Charge Stage LED Sequences
Charging Process
Absorption Float
Figure 4 - Charging Process
) on the output battery, keeping the
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