We have sold many of these units with 100% satisfaction but of late some vehicles now run a sophisticated charging system that "in laymans terms" the alternator charges at such a low voltage that it "fools" this standard type of DC to DC charger into thinking the vehicle is stationary therefore not charging the auxiliary battery. This mainly applies to some vehicles after 2010, so if you are not sure contact us though EBay ask seller a question (bottom of the description) and we will direct you to the one that suits your vehicle and best  suits your application circumstances.

The TDR02020 is the later model of the successful TDR02010 , the PRIMARY DIFFERENCE between the two models is the TRD02020 is 40mm shorter in length.

The Thunder DC to DC Charger (TDR02020) utilises a unique pulse charging algorithm with the intelligence to determine the best charge rate for your auxiliary battery (excluding lithium). We believe we have one of the best additions for your 4WD or camper ready to be installed. Included in this state of the art product is an MPPT solar regulator that is able to regulate up to 300W of solar @ 25V, this means that the TDR02020 will regulate your solar panel at maximum efficiency.

The TRD02020 is also a battery isolator , 8 stage battery charger from the vehicle and 3 stage battery charger from the solar all in one , Isolating the start battery with the ignition off and including charge functions of  BOOST , FLOAT and ABSORPTION charge. This unit will also compensate for low voltage wiring to it and the auxiliary battery DOES NOT RELY on the alternator to receive it's charge rate which in a lot of cases is not the optimum anyway, So if you need more battery capacity from your system consider this as an alternative you may have enough , just the Auxiliary battery may not be getting it's full charge.This unit also features MPPT ( maximum power point tracking ) solar regulator for connecting in with a solar panel system as well.

With a 20A output the TDR02020 may enough power to charge your auxiliary battery ( subject to how many amp hours they are ) while you are driving. Once the vehicle is turned off, the DC to DC charger will switch to the solar input when the main battery drops to 11.9V. An easy to read display shows your battery charge percentage and a Thunder logo that lights up in 10% increments.

Over temperature protection
Over charge protection this unit will automatically adjust its output based on battery and ambient temperature, preventing overcharge and overheating in small batteries and hotter climates.
Reverse connection protection 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 will automatically shut down if it detects an over voltage or under voltage problem preventing damage to the battery.
Spark-free protection the charger will not begin charging unless the load is securely connected, preventing output leads from sparking due to accidental short circuit.

Model: TRD02020
Dimensions: 180mm long x 130mm wide x 55mm high
Weight: grams 
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

1x Genuine Thunder TDR02020 dc to dc charegr with installation instructions
3x Terminal Covers
4x Insulators
4x Mounting screws




SKU TDR02020
Shipping Weight 0.8500kg
Shipping Width 0.140m
Shipping Height 0.200m
Shipping Length 0.060m
Shipping Cubic 0.001680000m3

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