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Thread: Connecting to battery

  1. #1
    Raw Wave justintime's Avatar
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    Connecting to battery

    Probably the dumbest question ever, but when you guys attempt to power your Opus or other CarPC PSU, do you wire it directly to the battery + and - terminals? You literally pass a cable through the car's firewall all the way to the battery, or do you just tap into ANOTHER 12V cable this side of the firewall?

    How about the audio amplifier?

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  2. #2
    Tainted Love Cris's Avatar
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    The positive wire MUST go all the way through the car's firewall to the car's battery. The GND can be connected to the - from the battery, but in almost all cases it's connected to any solid part the car's chassis.

  3. #3
    Newbie pixelflash's Avatar
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    I have a inverter that is +tive from inverter, thru firewall to +tive post of battery. -tive cable is grounded to car chassis near inverter (about 9 in. of cable). Try to ground your power supply as close to it (supply) as you can - I think you avoid ground loops and other EMF issues that way. HTH.
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  4. #4
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    Don't forget the fuse as close to the battery as possible.

  5. #5
    Newbie pixelflash's Avatar
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    Definitely include a fuse. I am running 8ga wire with a 30amp fuse about 4 inches from the battery on the positive line.
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  6. #6
    Bowel movement jjh221's Avatar
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    im so jealous you have a mame station/cabinet
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  7. #7
    Newbie Stray's Avatar
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    Why does the fuse have to be as close as possible to the battery?
    I'v put mine at the end of the cable, a few inches in front og the PSU. I don't think it matters because this is currently the only device on the cable.
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  8. #8
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    I believe the reason is just in case the cable itself gets shorted to ground (car chasis).

  9. #9
    Well, He asked for it. WebDog's Avatar
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    Quote Originally Posted by Stray
    Why does the fuse have to be as close as possible to the battery?
    I'v put mine at the end of the cable, a few inches in front og the PSU. I don't think it matters because this is currently the only device on the cable.
    Its so if you short the cable the battery wont explode. My firend exploded a battery before.

    The fuse will do no good if its on the far side, and the cable grounds out before it.
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  10. #10
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    Quote Originally Posted by Stray
    Why does the fuse have to be as close as possible to the battery?
    No problem with that.... if you don't mind your car being on fire

    Sorry about the sarcasm, i couldn't help. If the wire shorts somewhere before the fuse(the firewall for example), thats not good. I've seen an 8 gauge wire short to ground without a fuse...nasty. Imagine that wire getting hot enough to glow red and all the insulation melting and catching on fire, but it'll finally stop when the battery cables melt right off the battery under the hood.
    Don't hook an unfused wire to the battery... ever!

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