I have a digital 1 farad capacitor. When I turn my car off, the digits stay on reading the voltage on the capacitor's display. Is this normal? or will this little feature drain my battery? What do you think? Thanks in advance!!!
Its normal and there's not much you can do about it short of removing that digital readout(I did and put it in my dash, switched), but I don't think you have to worry much. That lil voltmeter/led combo draws a miniscule amount of current. It would take a very long time to kill your battery.
It shouldn't, as long as you drive the car regularly. Like Fishy said, that display should barely draw any power at all. If your really worried about it you could always put a switch on your main power line. Depends on how many amps your drawing though, if it's more than 40 or 50 then your not gonna be able to find a switch big enough.
Pico
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My cap stays on for about 10 minutes or so before the digi display goes off. It comes on anytime there is additional power used after it finally turns off, like opening the car doors (dome lights), and trunk (trunk light).
I was worried about it at first, but then found out that it is normal with my cap. Some stay on for a little while, and some go off right away.
There a 60amp fuse on my line of the amplifier. I guess I can't put a switch so that I can control it whenever I want. The cap shouldn't kill my battery with time by staying on all night then right?
There's a 60amp fuse on my line of the amplifier. I guess I can't put a switch so that I can control it whenever I want. The cap shouldn't kill my battery with time by staying on all night then right?
Oh no. To give you an idea of how long it would take to kill your battery most good car batteries are around 80 amphr's or so, maybe a bit less. That means that a fully charged battery of this type can deliver 1 amp of current for about 80 hours, 2 amps for 40, etc. The current draw from that display is on the order of milliamps, or thousandths of an amp. Your battery would probably last weeks or even months. I'm curious to know what Glasswolf thinks, but I wouldn't be surprised if a decent sized cap "leaks" more energy over time than what that voltmeter draws.