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BCDC
Dual Input Multi-Stage
In-Vehicle Battery Charger
MODELS:
BCDC1225D
ƒ
BCDC1240D
ƒ
BCDC1250D
ƒ
®
25 A
40 A
50 A

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Do you have a question about the BCDC Series and is the answer not in the manual?

Questions and answers

michael magill
May 11, 2025

alt power is going in but not coming out the brown it only showes aliz battery voltage i have disconneted it and re concetted it nothing happens

1 comments:
Mr. Anderson
May 20, 2025

If the Redarc Series device is receiving alternative power but not outputting it and only shows the battery voltage, the issue could be:

1. The Auxiliary battery is not connected or is below the minimum voltage required to begin charging (below 4.2V).
2. The input (e.g., vehicle or solar) is not properly connected or not providing a valid charging source.
3. There may be a problem with wiring, particularly the Ground (BLACK wire).
4. Fuses may be blown or improperly connected.

Check all connections, battery voltage, and fuses to identify the issue.

This answer is automatically generated

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Summary of Contents for Redarc BCDC Series

  • Page 1 BCDC ® Dual Input Multi-Stage In-Vehicle Battery Charger MODELS: BCDC1225D ƒ 25 A BCDC1240D ƒ 40 A BCDC1250D ƒ 50 A...
  • Page 2 BCDC1225D, BCDC1240D & BCDC1250D Dual Input Multi-Stage In-Vehicle Battery Charger The BCDC1225D, BCDC1240D & BCDC1250D Dual Input In-vehicle Battery Chargers feature technology designed to charge your auxiliary batteries to 100%, regardless of their type or size. The Dual Input In-vehicle Battery Chargers also feature a Maximum Power Point Tracking (MPPT) solar regulator.
  • Page 3: Table Of Contents

    CONTENTS WARNINGS AND SAFETY INSTRUCTIONS ��������������������������������������������������������������������������� SPECIFICATIONS ����������������������������������������������������������������������������������������������������������������������� 1 PRODUCT FUNCTION ��������������������������������������������������������������������������������������������������������� 1.1 Display Panel ���������������������������������������������������������������������������������������������������������������� 1.2 Charge Profile LEDs ���������������������������������������������������������������������������������������������������� 1.3 Charge Status LEDs ���������������������������������������������������������������������������������������������������� 1.4 Charging Process �������������������������������������������������������������������������������������������������������� 1.5 Soft Start Charging Process ������������������������������������������������������������������������������������� 1.6 Error Codes ���������������������������������������������������������������������������������������������������������������� 1.7 Battery Test Mode �����������������������������������������������������������������������������������������������������...
  • Page 4: Warnings And Safety Instructions

    BCDC1225D / BCDC1240D / BCDC1250D battery charger. 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.
  • Page 5 2. Do NOT alter or disassemble the Battery Charger under any circumstances. All faulty units must be returned to REDARC for repair. Incorrect handling or reassembly may result in a risk of electric shock or fire and may void the unit warranty.
  • Page 6: Specifications

    BCDC1225D BCDC1240D BCDC1250D Continuous Current Rating 25 A 40 A 50 A Vehicle Input Fuse Rating 40 A (Not Supplied) 60 A (Not Supplied) 60 A (Not Supplied) REDARC FK40 REDARC FK60 REDARC FK60 Output Fuse Rating recommended recommended recommended Output Power 375 W 600 W 750 W Vehicle Input Voltage Range 9 to 32 V...
  • Page 7: Product Function

    1 PRODUCT FUNCTION The BCDC1225D / BCDC1240D are three-stage, 12 V DC-DC battery chargers whereas the BCDC1250D is a four-stage, 12 V DC-DC battery charger. All BCDC Dual Input In-vehicle battery chargers operate from an alternator input of 12 V or 24 V and an unregulated 12 V nominal solar panel input.
  • Page 8: Charge Status Leds

    1.3 Charge Status LEDs The Charge Status LEDs indicate to the user which inputs are available and what stage of the charge process the unit is currently in. 1.3.1 SOLAR & VEHICLE LEDS 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.
  • Page 9: Charging Process

    1.4 Charging Process BOOST When the Charger is turned on, it will begin in 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.
  • Page 10: Soft Start Charging Process

    1.5 Soft Start Charging Process SOFT-START When the Charger is turned on, it will start ramping current from 0 A up to the full rated current, this is called Soft-Start and usually takes around 30 seconds. Once the full rated current is reached the charger will move into Boost stage. The soft start charging process only applies to the BCDC1250D.
  • Page 11: Error Codes

    1.7 Error Codes In the event of a fault with the unit installation, either battery or solar panel, ALL the LEDs on the unit will flash to indicate the fault type. Table 1.7.1: Flashing Sequences LED State Description 1 flash (followed by 3.5 second off) Internal hardware fault 2 flash (followed by 3.5 second off) Unit under temp fault...
  • Page 12: Installation

    2.1 Install Location The REDARC BCDC Mounting Bracket Series is available to suit a range of common vehicles. The brackets attach to pre-existing mounting points on the vehicle to facilitate installation of the BCDC, minimising the need for vehicle modification.
  • Page 13: Charge Profile Selection - Orange Wire

    2.2 Charge Profile Selection — Orange Wire Connect the ORANGE wire to set the Maximum output voltage to suit your selected Charge Profile. Refer to "Table 2.2.1: Charge Profile Selection" to select the correct profile for your installation configuration (Cabin Install or Engine Bay Install). Table 2.2.1: Charge Profile Selection Auxiliary Battery Location Maximum Battery Voltage...
  • Page 14: Input Trigger Settings - Blue Wire

    2.3 Input Trigger Settings — Blue Wire Connect the BLUE wire to switch the vehicle input turn-ON-trigger mode between: • Standard Trigger (for fixed voltage or temperature compensating alternators) • Low Voltage Trigger (for variable voltage alternators) Figure 2.3.1: Connecting the BLUE wire STANDARD TRIGGER LOW VOLTAGE TRIGGER Leave and tape over the disconnected...
  • Page 15: Wiring

    REDARC recommends using a soldered butt splice crimp connection (see "Figure 2.5.1: Ensuring a good wiring connection") that is covered with heatshrink. REDARC does not recommend using standard red/blue/yellow blade connections, as they are not rated for either the current required or gauge of wire supplied on the unit.
  • Page 16: Fusing

    2.7 Typical Setup REDARC recommends that the charger be installed by a suitably qualified person. Refer to "Table 2.4.1: Cable Sizing" for the Vehicle Input, Solar Input, Ground and Battery Output cable thickness and length requirements.
  • Page 17 2.7.2 LiFePO SETUP Figure 2.7.2.1: Typical LiFePO Setup (12 V or 24 V and Solar) Join GREEN and ORANGE Optional for LiFePO Charging 12 V GREEN ORANGE YELLOW BLUE 12 V Solar Panel Array (Unregulated)*** Low Voltage Disconnect Standard Trigger Fuse* Settings Loads Leave unconnected Load...
  • Page 18: Connecting Solar Panels - Yellow Wire

    2.8 Connecting Solar Panels — Yellow Wire The optional YELLOW wire connects solar input to the BCDC. If solar is not installed, tape over the unused wires. DO NOT connect solar panels that have inbuilt regulators. The BCDC has an inbuilt regulator that may not function correctly if regulated solar panels are connected.
  • Page 19: Troubleshooting

    3 TROUBLESHOOTING There are no LEDs ON at all. This indicates that there is no battery connected to the output (BROWN wire) or that battery is not at a suitable voltage level to be charged AND the input (YELLOW/RED wire) of the charger is not connected.
  • Page 20 I have Solar connected but the Solar LED is OFF. This indicates that the required turn ON conditions for this source have not been met. Either the Open Circuit Voltage at the YELLOW wire on the charger is below 9 V or there is not sufficient power available from the Solar Panel (due to poor light conditions or a faulty panel).
  • Page 21: Frequently Asked Questions

    The unit is also microprocessor controlled allowing it to output a REDARC proprietary charging algorithm independent of the input. This allows the unit to charge specific to the battery type even if the input voltage is low due to voltage drop.
  • Page 22 The most likely cause of this issue is that the BCDC Dual Input is somehow stuck in 24 V mode. Try removing the Vehicle wire (RED) and reconnecting it. If the problem persists, contact REDARC. Alternatively, the input voltage may be too low, check that the input voltage is above the input thresholds outlined in "1.6 Turn On/Off Thresholds"...
  • Page 23: Warranty

    23 Brodie Road (North), Lonsdale South Australia 5160, Australia Design and specifications are subject to change without notice | Copyright © REDARC Electronics Pty Ltd� All rights reserved REDARC®, THE POWER OF REDARC®, and BCDC® are trademarks of REDARC Electronics Pty Ltd�...
  • Page 24 CONTACT Tech Support 1300 REDARC Head Office +61 8 8322 4848 New Zealand +64 9 222 1024 UK & Europe +44 (0)20 3930 8109 redarc.com.au +1 (704) 247 5150 Canada +1 (604) 260 5512 Mexico +52 (558) 526-2898 redarcelectronics.com INST173-1 EN...

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Bcdc1225dBcdc1240dBcdc1250d

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