REDARC BCDC CORE 40A DC-DC Charger & MPPT Solar Controller

Price:  £395.29   (£329.41 Exc. VAT)

Product code:  P03903
Brand:  Redarc
Current Rating  40A
Open Circuit Voltage Rating  32V



Awaiting new stock.

Note: Cables not included. Please download installation instructions to determine correct cable size and fuses for your application.

The BCDC Core 40A DC to DC in-vehicle battery charger is the next evolution of REDARC's legendary BCDC platform that has been powering off-grid adventures for over 10 years. The BCDC Core is the perfect DC to DC charging solution for internal mounting in vehicles where weatherproofing isn’t required.

Suitable for use with standard or 'smart' alternators, the BCDC Core combines a 40A DC-DC (battery-to-battery) charger together with a 600W MPPT solar charge controller, giving you the ability to charge either from your alternator, your solar panels, or both simultaneously. It utilises Green Power Priority, so the charger will always use the maximum amount of solar power available with the remainder of the rated output being provided by the vehicle's alternator. This approach maximises the charge rate and minimises the load on your alternator, saving fuel.

The BCDC Core supports all battery types (wet and sealed lead-acid, AGM, Gel, calcium and Lithium) and uses multi-stage charging technology to ensure 100% full charging, maximising the performance and life of your batteries. It is straightforward to install with a very simple setup and has a wide vehicle input voltage range (9-32V DC), allowing you to charge a 12V battery from either a 12V or 24V alternator input. This makes is suitable for use in vans and small motorhomes as well as in larger motorhomes, horseboxes and lorries.

The BCDC Core has no noisy fans and the housing is compact and slimline, making it perfect for hiding away in confined spaces and leaving you room for more important things. Common installation positions are behind a bulkhead, under a seat, or inside a cupboard, in fact any internal location with a bit of space around the unit for ventilation.


  • Suitable for internal vehicle installations
  • Compact form factor and silent operation
  • Simultaneous DC and solar charging with Green Power Priority
  • Suitable for 12V or 24V standard and smart alternators
  • Maximises the performance and life of your auxiliary battery
  • Can charge AGM, GEL, standard lead acid, calcium and Lithium (LiFePO4) batteries

Further information

Although the maximum power output of this unit is 600W, a larger solar array can be connected and the charger will automatically limit power going to the unit if the panels supply more than the maximum wattage needed. While output power may be limited in peak solar conditions, having this additional solar panel wattage is beneficial for solar power availability when conditions are sub-optimal. This will allow the BCDC Core to charge more effectively earlier in the day and later into the night when solar irradiance is lower, when panels are shaded or when they cannot be angled directly towards the sun.

As a guide, the BCDC Core 40A is typically used for lead acid battery banks over 200Ah and lithium batteries over 100Ah. Check the manufacturer’s data for your battery and ensure that the ‘Continuous Current Rating’ of the charger does not exceed the manufacturer’s recommended maximum charging current. For smaller batteries, REDARC recommends the BCDC Core 25A

Important - only to be used with solar panels or solar panel arrays that have an Open-Circuit Voltage (Voc) of 32V or less.  Greater voltages may damage the unit and will void the warranty.

  • Vehicle Input voltage range: 9-32V DC (suitable for 12V or 24V alternators)
  • Solar input voltage range (unregulated): 9-32V DC (N.B. do not exceed - unit may be damaged)
  • Solar input power: Not limited, but array must not exceed 32V (connect in parallel)
  • Output system voltage (nominal): 12V DC
  • Maximum charging voltage: 15.3V DC
  • Maximum current rating: 55A
  • Maximum continuous current rating: 40A
  • Maximum output power: 600W
  • Recommended vehicle input fuse rating: 60A
  • Recommended output fuse rating: 60A
  • Minimum voltage of output battery: 0.1V
  • Battery type suitability: Wet/Sealed Lead Acid, AGM. Gel, Calcium, LiFePO4
  • No load current: <100mA
  • Standby current: <8mA
  • Operating temperature range: -15 to +80°C (output is de-rated above 55°C)
  • Weight: 0.9kg
  • Overall dimensions: 165 (L) x 120 (W) x 37 (H) mm
  • Type approval: ECE Reg.10
  • Warranty: 2 years

Part Number:  9122

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REDARC is based in South Australia and has been designing, developing and manufacturing a range of electronic voltage converters & associated products for over 40 years. Tested in the extremes of the Australian Outback, these are rugged products from a brand you can trust.

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