Thunder 20A DC-DC Charger with Solar Reg

SKU: TDR02010
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A Thunder DC to DC battery charger is the smart way to charge your auxiliary battery, no matter your vehicle.

The Thunder DC to DC Battery Charger (TDR02010) 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 11.9V
  • 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 will fully cut out at 80 degrees.
  • Installing the TDR02010 could not be easier with 4 mounting holes and 4 easy-to-use wiring studs there is minimal fuss to the unit.
  • The TDR02010 is able to be installed into everything from a 1960 40 Series Toyota LandCruiser right up to a 2016 Ford Ranger.


Thunder 20A DC-DC Charger with Solar Reg has a rating of 5.00/5 based on 5 reviews.

DC-DC charger

Works well and fits where i wanted to put it

on 11 September 2020

Great Product

We had a thunder 20A DC-DC charger installed in our camper van and it works a treat. Love the % display too.

on 1 July 2020

Solar charger

Works a treat

on 15 October 2019


Great product easy to use

on 7 October 2019

Battery charger

Put the charger to the test with a recent trip to cairns and was quite impressed. Kept my second battery completely charged during the trip

on 20 July 2019
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Thunder 20A DC TO DC charger
Charging style. 8 stage from vehicle and 3 stage 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
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