Hi all, need advice on backup battery circuit in car(please see attached diagram for the circuit).
What I want to do is to install a backup battery in my car for dashcam so
1) when ignition is off(like parking overnight) the relay is disconnected so the dashcam will only draw power from the backup LFP battery
2) when ignition is on and engine(alternator) is running, relay is triggered so the main car circuit will charge the backup LFP battery
3) when ignition is on and starting the engine, the diode should prevent any current being drawn from the backup LFP battery to the main circuit.
I would like to have your advice on the diagram and please let me know if you see any problems, thanks a lot!
What I want to do is to install a backup battery in my car for dashcam so
1) when ignition is off(like parking overnight) the relay is disconnected so the dashcam will only draw power from the backup LFP battery
2) when ignition is on and engine(alternator) is running, relay is triggered so the main car circuit will charge the backup LFP battery
3) when ignition is on and starting the engine, the diode should prevent any current being drawn from the backup LFP battery to the main circuit.
I would like to have your advice on the diagram and please let me know if you see any problems, thanks a lot!
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