REDARC (BCDC1225D) 12V DC-DC Battery Charger

You can rely on this REDARC 12v battery charger if you're going into the wilderness and want to enjoy all the creatures comforts of home. Frozen margs on the beach? NO WORRIES mate. This 12V battery charger is a 25A in-vehicle DC to DC battery charger designed with the highest quality technology from REDARC.

This Redarc battery monitor and charger is used for charging your car batteries, as well as secondary batteries whilst travelling remotely. The Redarc battery management system has the most recent version of REDARC's in-vehicle charging technology, which simultaneously charges from solar and DC inputs. The Redarc 12v battery charger is one of the most advanced twin battery chargers on the market. This advanced technology has improved battery charging with the next evolution of REDARC's DC to DC charging technology. The REDARC battery charger can charge from both the solar panel and the alternator at the same time since it has a Maximum Power Point Tracking (MPPT) solar regulator. Not to mention it comes with a very easy DIY 12v battery wiring guide so all the home sparkys out there can give it a red hot crack. If you’re not sure, no harm in taking your set up into an auto electrician, better safe than stuck.

This Redarc 25AH 12v battery charger, which has a Maximum Power Point Tracking (MPPT) solar regulator, will charge from the sun and the alternator concurrently. Additionally, the Redarc battery charger/monitor will choose solar charging first thanks to built-in "Green Power Priority," which reduces the burden on the alternator. The device is appropriate for 12 volt 4WD/caravan & camper electrical systems and is compatible with both normal and variable/smart alternators. The REDARC 12v battery charger is compatible with charging AGM, Gel, Standard Lead Acid, Calcium, and LiFePO4 batteries since it has the same unique charging profiles as its predecessor and a new lithium charging profile. The Redarc BCDC 12v battery charger is award-winning technology that has been independently validated and tested to guarantee maximum battery life and a battery charge of a known 100 percent. The Australian-made, specially-tested DC to DC 12v battery charger and battery management system is unaffected by water, dust, or vibration. It can operate in the scorching Simpson Desert heat up to 80°C and can cross deep water at Cape York as it is water resistant.

*Mounting brackets sold seperately.

Features:

• Separate DC and solar charging inputs
• Maximises the performance and life of your auxiliary battery
• Simultaneous DC and solar charging with Green Power Priority
• Suits 12V standard and variable voltage/smart alternators
• Suitable for AGM, GEL, standard lead acid, calcium and LiFePO4 batteries

• Input (Operating) Voltage 9 - 32VDC
• Output System Voltage 12VDC
• Maximum Charging Voltage 15.3V
• Output Current Rating (Cont.) 25A
• Input Current (Max.) 25A
• Input Fuse Rating 40A
• Output Fuse Rating 40A
• Warranty 2 Years
• Standby Current Draw <100mA
• Output Power 375W
• Width (mm) 120
• Height (mm) 37
• Type Approval CE
• Length (mm) 165
• Weight (kg) 0.85

How does a REDARC DC to DC charger work?

A REDARC DC to DC charger solves the common problem of voltage drop when charging caravan or camper batteries directly from an alternator. Long cable runs and components like diodes often reduce charging voltage, leaving batteries only 70–80% full. The REDARC BCDC1225D boosts the voltage and delivers a steady 25A charge so your batteries reach full capacity faster. It also combines alternator and solar inputs at the same time using MPPT solar regulation, with Green Power Priority selecting solar first to ease the load on your vehicle. 

Do DC to DC chargers drain the main battery?

No. Unlike direct alternator charging, which can sometimes backfeed and discharge the starter battery, the BCDC1225D includes a built-in isolator. This disconnects the charger when the engine is off, so you don’t risk flattening your main battery while camping or parked. 

Can redarc BCDC1225D charge lithium?

Yes. It includes selectable charging profiles for AGM, Gel, Standard Lead Acid, Calcium, and Lithium (LiFePO4) batteries. Each profile is designed to deliver the correct charging voltage, helping your batteries last longer and maintain maximum usable capacity. 

Do I need a 25A or 40A DC-DC charger?

The choice between a 25A or 40A DC-DC charger depends on your battery bank size and charging needs. For battery banks up to 200AH, a 25A charger is suitable. For larger capacities, consider a 40A charger

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