I'm thinking of putting together a source of backup power that could crank the engine and start the car, even if the battery is discharged and/or cold. A bank of supercapacitors would provide the power to turn the engine. 6 x 2.7V/500F in series with balancing circuitry, to total 16.2V/83F max. The supercapacitors would be charged from the main car battery via a voltage boost circuit, so even when main battery voltage drops below 12V, the supercapacitors can still be charged to about 14V. A diode would prevent power returning to the battery, and the starter would be the only thing connected to the supercapacitors.
Here is the general order of the circuit I have in mind:
car battery > diode > voltage booster > supercapacitors > starter
Could this damage the car's battery or electronics? Am I overlooking anything here? Thanks for any input.
Sam
Here is the general order of the circuit I have in mind:
car battery > diode > voltage booster > supercapacitors > starter
Could this damage the car's battery or electronics? Am I overlooking anything here? Thanks for any input.
Sam