Thunder 20A DC/DC Charger – TDR02020



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Thunder 20A DC/DC Charger – TDR02020

Easy to install, the Thunder DC to DC charger is the smart way to charge your auxiliary battery, no matter your vehicle. The Thunder DC-DC Charger utilises a unique pulse charging algorithm with the intelligence to determine the best charge rate for your auxiliary battery (excluding lithium).

    • MPPT solar regulator will regulate solar panels at maximum efficiency capable of up to 300W of solar @ 25V
    • 20A output to charge your auxiliary battery while driving
    • Automatically switches to the solar input when the vehicle battery is turned off or main battery drops to 12.2V
    • Splash resistant (not IP rated)
    • Easy to read and comprehensive LED display
    • Simple to install – 4 mounting holes and 4 easy-to-use wiring studs
    • Rate of charge starts to decrease at 50 degrees and willfully cut out at 80 degrees

 Key Features 

Over-temperature protection The TDR02010 will automatically adjust its output based on battery and ambient temperature, preventing overcharge and overheating in small batteries and hotter climates.
Reverse connection protection The charger will detect and indicate a reversed connection on the input and output terminals, preventing damage to the internal circuitry of the unit.
Over and under-voltage protection The TDR02010 will automatically shut down if it detects an overvoltage or under voltage problem, preventing damage to the battery.
Spark-free protection The TDR02010 will not begin charging unless the load is securely connected, preventing output leads from sparking due to an accidental short circuit.


Charging style 8 stages from the vehicle and 3 stages from solar Input
12.4 to 16.0 Volts DC Output voltage 13.1-16.2V (stops charging when alternator or vehicle battery below 11.9V)
Output current 20 Amps Minimum start voltage for 2nd battery 1.5 Volts
Maximum solar input voltage 25 Volts Maximum solar watt input 300 Watts
Soft start Yes Battery range 18 to 250Ah

Weight 1.5 kg
Dimensions 10 × 10 × 5 cm