Thunder 20A DC-DC Charger W/Solar Input - TDR02021

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Or 4 payments of $62.25 with AFTERPAY

Product Details

Compact in size and easy to install, the new Thunder DC-DC Charger is thesmart way to charge your auxiliary battery, no matter your vehicle. Utilisinga unique pulse charging algorithm with the intelligence to determine the bestcharge rate for your auxiliary battery, this charger is the perfect addition to anyvehicle requiring the management of a dual battery setup.

One of the greatest features of the new DC-DC Battery Charger, is the newremote Bluetooth LCD screen; giving you better visibility on your battery's stateof charge. The new charger also features Modular Sense Technology (MST)allowing you to link multiple units together giving you a 20, 40 or 60A outputwithout having to outlay for a larger unit upfront.

Suitable for Gel, AGM, Calcium, Lead Acid and now Lithium batteries,Thunder's new DC-DC Charger is an ideal addition for caravans,camper trailers and 4WD's.


  • Heavy duty aluminium case
  • Easy to read Bluetooth LCD screen
  • 12-24V system input (12V output)
  • 0-90C Operating temperature
  • IP67
  • MST (Modular Sense Technology)
  • Microchip monitoring and control
  • Fully automatic high frequency multi stage charging


  • Output: 20A
  • Input Fuse Rating Minimum: 30A
  • Output Fuse Rating Minimum: 30A
  • Vehicle Input Voltage Range: 12.2V - 26V If voltage increases over 26V the Thunder DC-DC will shut off, reset will be needed
  • Min And Maximum Charing Voltages: 13.1V - 15.2V Stops charging when alternator or vehicle battery below 12.2V
  • Lithium Charge Voltages: 14.2V Bulk, 13.2V Float
  • Solar Input Voltage Range: 13V-50V
  • Maximum Solar Watt Input: 300W Exceeding 300W of solar will damage the charger
  • Charghing Sytle: 8 stage from vehicle and 3 stage from solar
  • Operating Temerature: 0C to 90C (current de-rates after 90)
  • IP Rating: IP67
  • Float Voltage: 13.8V
  • Standby Current: 10mA
  • Battery Range: 18 to 250Ah

Part Number: TDR02021

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About the Brand Products

Go places you’ve never been before with Thunder Auto.

Thunder Battery Chargers and 4WD Accessories make adventure more affordable and accessible than ever before for up and coming 4WD enthusiasts.

Designed to bridge the gap between entry level and professional quality 4WD accessories, battery chargers and automotive accessories, Thunder products are built to withstand the most testing conditions.

What makes Thunder Battery Chargers so good?

Thunder Battery Chargers operate on an eight-phase charging program that allows for the identification of faulty batteries while also preserving the life of your battery and ensuring maximum charge.

The charging process begins with the Thunder charger de-sulfating your battery and performing tests to determine the condition of your battery. From there, Thunder battery chargers perform a soft start to ensure your battery isn’t flooded with charge and overloaded. The charger will then enter the bulk charge stage to complete much of the charge.

The final stage of the battery charge involves absorption, analysis, boost, float, and maintenance to ensure that battery is completely full and maintains charge until you are ready to next use it.

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