20 Amp Dual Purpose DC2DC charger with MPPT

R 4,300.00


  • Waterproof with breather to equalise internal and external pressure to prevent water ingress
  • Adjusts charge rate to protect alternator if vehicle voltage drops too low and turns ON warning LED


  • Waterproof with special breather membrane that equalises internal and external pressure thus preventing water getting in the unit as a result of temperature fluctuations
  • Can be mounted external to vehicle and in engine compartment
  • Auto switch over from Solar Panel MPPT mode to Car mode when alternator voltage is detected
  • Will automatically charge vehicle main battery when in Solar Panel mode and second battery is fully charged
  • High current dual purpose 20A 12V DC to DC battery charger
  • Suitable for deep cycle and cranking lead acid batteries of 70Ah and higher battery capacities
  • Eliminates dual battery switch
  • Will not flatten vehicle battery
  • Compensates for voltage drops over supply wires
  • Dual purpose lead acid battery charger (charges from car or solar panel without having to re-connect car or solar panel)
  • Integrated 300W MPPT solar charger
  • Integrated alternator overload protection
  • Integrated bypass circuit automatically connects loads directly to alternator when charger operates thus making full 20A available to charge battery.
  • Three state charger optimises charging (bulk, constant voltage and trickle charging)
  • Two colour charge indicator LED shows charging and charge completion status
  • Integrated battery temperature compensation to prolong battery life
  • Red fault indicator LED lights up if vehicle wiring does not meet minimum resistance requirements
  • Noiseless with no cooling fans
  • Integrated over temperature protection
  • Short circuit and reverse battery protection on all inputs and outputs
  • Sturdy powder coated die cast aluminium enclosure

Easy installation with high quality screw type wire connections

Breather notes

Traditional sealed waterproof enclosures use an o-ring to seal the product but this method is not suitable for operation in extreme environments where the product is subjected to large temperature fluctuations and water as found in engine compartments. In engine compartments the ambient temperature can easily reach 50°C to 60°C. If the engine mounted product is now suddenly cooled as a result of splashed water or wading the product cools down quickly and the internal pressure drops and water is sucked past the o-ring and becomes trapped inside the product. The only way to prevent the water ingress is to provide the unit with a breather made of a porous plastic membrane with hole sizes small enough to prevent water molecules passing through the membrane but large enough to allow air to freely pass through the membrane. The membrane thus equalises the internal and external pressure preventing water being sucked into the enclosure when subjected to cooling when exposed to water.


Switch ON voltage


Switch OFF voltage

<12.5V nominal 

Solar panel voltage

28V max open circuit voltage

Solar input power

400W max

Charge current

20A max

Output voltage

14.4+/-0.1V at 25°C in charge mode (Amber LED ON)

Output voltage

13.8 +/-0.1Vat 25°C in Trickle mode (Green LED ON)

Load current

15A max

Input current

38A max with max load current of 15A

Operating temperature

-10 to +65 degrees Celsius