AutoGRAPH ON-BOARD CONTROLLER • USER MANUAL
57
TechnoKom © 2016
Connection of Backup Battery
To avoid the AutoGRAPH controller turning off, if the main power supply shuts down, the
power supply driver supports connection of a rechargeable backup battery.
As a backup battery, the tracker uses a lead/acid rechargeable battery of 12 V and 1.2 to 2
Ah capacity.
AutoGRAPH-GSM+, AutoGRAPH-GSM+WiFi and AutoGRAPH-WiFi controllers have a built-
in charger to charge the backup battery. The charger turns on automatically and limits the
charging current to 75 mA.
If the backup battery voltage drops below 11 V, the tracker will send a low battery notification
to specified number by SMS.
Switching between the main power supply and the backup power supply is performed
automatically. If the main power supply turns off, the tracker switches to the backup power
supply. As soon as the main power supply is restored, the controller will switch back to the
main power supply.
Connection Diagram of backup battery
BACKUP BATTERY
RED SHORT (5)
BLACK (2)
It takes about 30 hours to charge fully discharged 2 Amh capacity battery. So the presented
diagram is not applicable in case of frequently shutdowns of main power supply.
IMPORTANT
The manufacturer recommends using small
package lead/acid DT12012 or BPL2-12
batteries and another battery with capacity
not more than 2Ah as a backup power
supply. Example of lead/acid battery is given
on figure on the right.
