Thread: Electrical People..! Farads and Power Ques...

Ok after looking a bit more, the capacitor i think would discharge in about 5 seconds, but its not constant output, it declines... rapidly. so this would help for crank survival, but FA else

you're going to need to know at what voltage the computer will turn itself off at. Then maybe doing it like a RC time constant problem.

Let's say it shuts off at 80% of full voltage, because it's drawing 3.5 amps (I just used what you supplied) 19/3.5 = 5.43 which we will use for R.

T=RC= amount of time it takes for voltage at the cap to decay to 63%.

so work it kind of like an exponential decay and you have your answer.

About 1.2 seconds at that current.

I cheated and used this calculator though. I'm pretty sure the percent is not a percent of voltage it's percent from voltage. So I used 20% for the example.

Yeah thats how i looked at it too. cheers