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*1 LV Versions not suitable for use in 24V vehicles 

1 PRODUCT 

FUNCTION

The BCDC2420(-LV) is a three-stage, 24V DC-DC battery charger that operates from an 
alternator input of 12V nominal or a 12V nominal solar panel input. The BCDC2420 will 
also charge from an alternator input from a 24V nominal vehicle*

1

. The input voltage of 

the BCDC2420(-LV) can be above, below or equal to the output voltage making it ideal 
for charging an auxiliary 24V battery bank where the distance from the main battery 
may cause a signifi cant voltage drop. The BCDC2420(-LV) is also designed to isolate the 
main battery from the auxiliary battery to avoid over-discharging the main battery. The 
BCDC2420-LV operates almost identically to the BCDC2420 but is designed to operate 
from an ignition trigger to allow operation in vehicles with Variable Voltage or Smart 
Alternators.

1.1 Display 

Panel

The front panel features 6 LEDs to display the charge profi le and charge status. 

LED State

‘Charge Profi le’ 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

When blinking, the fl ash duty-cycle of the ‘Charge Status’ LED will increase to 
refl ect the amount of current being supplied - If the LED is ON solid, the unit is 
supplying full power (e.g. 20A for a BCDC2420).

CHARGE PROFILE

BCDC2420

24V 20A DC/DC 3 stage battery charger

A

B

C

redarc.com.au

Figure 1.6.1 - The BCDC2420(-LV) Front Panel

Summary of Contents for BCDC2420

Page 1: ...In vehicle 3 Stage 24V Battery Charger BCDC2420 BCDC2420 LV ...

Page 2: ...ppliance by a person responsible for their safety Children should be supervised to ensure that they do not play with the Battery Charger 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 3 Only use the Battery ...

Page 3: ...roubleshooting 12 4 Frequently Asked Questions 13 5 Two Year Warranty 14 Specifications Part Number BCDC2420 LV Continuous Current Rating 20A Input Fuse Rating 12V 24V 60A 40A Not supplied Output Fuse Rating 30A Not supplied Output Power 600W DC Input Voltage Range 9 32V 9V 16V for LV model Solar Panel Open Circuit Voltage 17 5V 28 0V Output Battery Type Standard Lead Acid Calcium content Gel AGM ...

Page 4: ...y to avoid over discharging the main battery The BCDC2420 LV operates almost identically to the BCDC2420 but is designed to operate from an ignition trigger to allow operation in vehicles with Variable Voltage or Smart Alternators 1 1 Display Panel The front panel features 6 LEDs to display the charge profile and charge status LED State Charge Profile LED Charge Status LED Off Unit has no Power Ou...

Page 5: ...age maintains 13 3V on the output battery keeping the 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 1 3 Turn On Off Thresholds 12V BCDC2420 12V BCDC2420 LV Solar All Models 24V standard 3 BCDC2420 Input Open Circuit Low voltage conditions 1 Turn ON above 13 2V 12 0V 17 ...

Page 6: ... Solar panel 7 flash 7 flash followed by 3 5 second off Reverse polarity NOTE The unit will operate optimally below 55 C with good airflow At higher temperatures the unit will de rate output current NOTE Appropriate connections must be made to the wires with a continuous current rating of at least 20A for the BCDC2420 LV Failure to do so may cause damage to the unit and vehicle 2 INSTALLATION Moun...

Page 7: ...For standard non LV models the BLUE wire may be permanently connected to the Input Source Positive supply and the charger will only charge when the alternator is running This is not suitable for the BCDC2420 LV 2 1 2 Solar Input TheBCDC2420isalsocapableofchargingtheauxiliary battery from a Solar source The unit will accept an input directly from an unregulated 12V nominal solar panels and act as a...

Page 8: ...RED wire Input source positive This will set the Maximum voltage to 30 8V 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 for your battery type is too high please select another charging profile 2 3 1 ORANGE wire Setting Recommendations Auxilia...

Page 9: ...ssis of the vehicle on the chassis of the trailer camper caravan or directly wired to both batteries depending on your installation requirements 2 6 GREEN wire Optional External LED Indication The GREEN wire is provided to optionally connect an external indicator LED which can be mounted away from the unit for example on the vehicle s dashboard Connect the positive lead of the LED to the green wir...

Page 10: ... fire We recommend that this activity be undertaken by an appropriately trained person REDARC recommends using a soldered butt splice crimp connection that is covered with heatshrink See Figure 2 8 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 Crimping provides good mechanical c...

Page 11: ...ack Brown Green 12V INPUT OR 24V BCDC2420 Loads 30A Fuse Load Fuse Auxiliary Battery 12V All ground points must be connected to chassis earth Start Battery Fuse INPUT to vehicle ignition Fuse Ratings as per table on Page 2 Red Blue Orange Black Brown Green Charging Profile Select Refer to section 2 3 Optional LED BCDC2420 LV Figure 2 8b BCDC2420 LV Standard setup for a 12V Start Battery Figure 2 8...

Page 12: ...ED A Relay suitable for 12V Vehicle installations is available as part of the REDARC RK1260 Relay Kit The kit also includes butt splice connectors a wiring loom heat shrink and instructions Automatic Source Select BOTH MODELS Loads 30A Fuse Load Fuse Auxiliary Battery All ground points must be connected to chassis earth SOLAR 12V Solar Panel Array INPUT Fuse Ratings as per table on Page 2 Red Blue...

Page 13: ...nection to the auxiliary battery If the problem is still evident get a qualified Auto Electrician to inspect the system The BCDC is not operating correctly Have a qualified Auto Electrician check the wiring fuses batteries and charging system or contact REDARC Electronics for more information Check the input If the problem is still evident contact a qualified Auto Electrician or REDARC Electronics...

Page 14: ...to be mounted into a Caravan or Camper near or in the battery compartment is generally the best position It is also a good idea to mount the BCDC to a metal surface if possible to ensure optimal heat dissipation though this is not crucial Q What does the charger do if the temperature around it rises above its operating temperature A As the temperature of the BCDC rises above a certain level the cu...

Page 15: ...uct including without limitation choice of location 6 4 failure to ensure proper maintenance of the Product strictly in accordance with Redarc s instructions or failure to ensure proper maintenance of any associated equipment or machinery 6 5 repairs to the Product that are not strictly in accordance with Redarc s instructions 6 6 installation repairs or maintenance of the Product by or under the ...

Page 16: ...nics 23 Brodie Road North Lonsdale SA 08 8322 4848 power redarc com au www redarc com au Copyright 2018 REDARC Electronics Pty Ltd All rights reserved www redarc com au WARBCDC2420 REV4 For specific USA Warranty terms please visit www redarcelectronics com ...

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