5
WE RECOMMEND INSTALLATION BY A QUALIFIED AUTO ELECTRICIAN
• Secure the charger using the mounting tabs on the unit.
• Connect the input blue wire on the rear of the charger using suitable cable to
the main starting battery of the vehicle (see specification table on page 8). It is
recommended to place a circuit breaker (30A minimum, not supplied) in the main
positive lead as close as possible to the starting battery.
• Connect the auxiliary battery to the output red wire of the charger. Ensure the
correct size cable is used to prevent any voltage drop (see specification table on
page 8).
• It is recommended to place a circuit breaker (30A minimum, not supplied) in the
auxiliary positive lead as close as possible to the auxiliary battery.
• Secure the negative wire to the common negative black wire and secure to a
metal (unmoving) part of the vehicle. It is preferable to connect this directly to the
negative terminal of both batteries (see specification table on page 8).
• The TDR02021 is compatible with the newest computer controlled alternators.
For installation into vehicles with variable voltage alternators, negative must be
connected to vehicle chassis.
• If connecting a solar panel, connect the positive from the panel to the solar
input yellow wire and the negative of the panel to the negative black wire (see
specification table on page 8).
• There is no need for an external regulator the DC-DC has a built in MPPT solar
regulator.
• Check all connections are tight and secure.
• If charging a lithium battery, the green battery select wire will need to be
connected to battery earth (see specification table on page 8).
NOTE:
Only connect this wire if charging a lithium battery pack as it will cause damage to
alternate battery packs.
• Fit the LCD display in your desired spot.
• Once correctly installed the TDR02021 is a simple set and forget dual battery solution.
• Connect the red wire to battery positive and the black wire to earth from the
display. There is a handy switch to disable the display (see specification table
on page 8).
• Start the vehicle and let it idle, the charger will recognise that there is charge being
applied to the main starting battery. Once the main starting battery has reached
13.1V the charger will automatically begin to charge.
• The charger will continue to operate even after the vehicle has been switched off,
however once the main start battery falls below a loaded voltage of 12.2V the
charger will automatically shut down.
• The TDR02021 will prioritise the vehicle input over the solar input so while the
battery voltage is above 12.2V it will continue to charge, however once the main
battery has reached a loaded voltage of 12.2V and the charger switches off it will
look for a solar input.
• If the solar input is above 13V then the green LCD on the display will illuminate
to indicate that the TDR02021 is now using the solar input to charge the auxiliary
battery.
• LCD display will move to the solar charging screen when using solar.
INSTALLATION
