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[Saifmusazai]

i want to charge my car bettery with computer power suply. But in power suply there is a yellow color wire having voltage is 12v thats ok,,, but ampere is low as about 1ampere to 2ampere only (which is not suffient to charge my car bettery). My problem is that how to increase the amperage of (yellow 12v wire) so that it charge my bettery easily.
regds,
thanks. plz reply in detail to solve my problem.

 

[Chuppster]

I regularly use computer PSU's for my projects and I typically find that most of them have a 12v supply rail that can supply at least 15 amps. Could you post a picture of the sticker on your PSU?

 

[ElectriSean]

The only way to increase the charge current is to increase the voltage. Automotive chargers usually output 14-15V for their fast charge modes. Using a straight 12V power supply will never fully charge a car battery, but it may get it high enough to start and allow the alternator to do the rest.