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Thread: How to wire direct form battery?

  1. #1
    Maximum Bitrate EBFoxbat's Avatar
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    How to wire direct form battery?

    Ok, I'm not a car guy. I'm not an electronics guy (I do LEDs and switches, so I have fundamental knowledge.) I also don't do car stereos, hence Iím going the FM modulator route.

    I was going to go 400-watt inverter thru the cigarette lighter. Iíve decided to go 750 Watt inverter directly from the battery.

    How do I wire directly to the battery? My battery is on the driverís side near the windshield. Should I run it through the wheel-well and up in be the e-brake? How does one drill through the car body? Should I add some caulking or something to seal the hole once the wires are thru?

    I and and came up almost empty. Thanks for the help.
    ,./(0)3

    '04 Canyon 4x4 pickup

    [---PC on hold----working on external fiberglass "tool" box---]

  2. #2
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    power have it run on the same side of the car as the battery

    I would NOT run the power cable on the outside of the car. For several reasons. One is most shielding is not outdoor approved.

    4-8 gauge should be fine with a fuse 8 inches from the battery source. Ground the inverter with the shortest run possible same gauge as the power dedicated only to that wire to avoid interference.


    Just my .02 cents

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    If you are gonna be pulling 750W, this is what I would do... wire the same way you would an amp. Take 8 (or 4 preferably) guage wire with a 50-80 amp fuse no more than 18in away from the battery and wire that to the positive of the inverter. then run a a couple 25amp fuses in series at the inverter. Then wire a 8 (or 4 preferably) guage wire to the body/frame of the car with a length of no more than 18 inches (the shorter the better)..

    Makes sense?

  4. #4
    Maximum Bitrate EBFoxbat's Avatar
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    Quote Originally Posted by trancified
    If you are gonna be pulling 750W
    I hope not, that just what the inverter is rated at. You're saying:


    [Battary +]-------------18 inches----[50amp fuse]-------[+ input on inverter]
    [- input on inverter]---18 inches----[frame of car]

    I understand that. But how do I run the wires thru the body of the car. Drill a hole, run the wires, and caulk it? And How do I attach the neg from the inverter - to the frame?
    ,./(0)3

    '04 Canyon 4x4 pickup

    [---PC on hold----working on external fiberglass "tool" box---]

  5. #5
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    yes, your diagram is correct... where are you going to situate the inverter? usually there is at least one hole that has a stopper in it going from the engine compartment to the inner compartment. Use that... you can get grommets that will seal around the metal edges and protect the wire.

    just use an eye connector from the neg of the inverter and run a screw thru it and screw directly to the frame. You might be able to find another spot where there is a ground screw, and you can use that.

  6. #6
    Variable Bitrate no1knows's Avatar
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    drill a hole from your engine bay to passenger compartment, then flash a torch through to find it under the carpet/behind the dash, use common sense when deciding where, choose where its easiest to find and easiest to run the wires.
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  7. #7
    Maximum Bitrate EBFoxbat's Avatar
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    OK thanks guys. All the other hopes have grommets that make a tight seal. I assume I can get those little type things at a NAPA or something.

    Does a short ground wire make much of a difference? I'm looking at 4 feet or so just to get to the frame, probabaly 5 to run it in a tidy fashion.
    ,./(0)3

    '04 Canyon 4x4 pickup

    [---PC on hold----working on external fiberglass "tool" box---]

  8. #8
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    Waaayyyyy to far... you need as short a wire to ground as possible or else it won't be much of a ground. if you have to, connect directly to floor.

  9. #9
    Maximum Bitrate EBFoxbat's Avatar
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    hmm, the floor will do... hows, um, 4 inches of line work ?
    ,./(0)3

    '04 Canyon 4x4 pickup

    [---PC on hold----working on external fiberglass "tool" box---]

  10. #10
    Maximum Bitrate EBFoxbat's Avatar
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    how do I connect to the battery ?
    ,./(0)3

    '04 Canyon 4x4 pickup

    [---PC on hold----working on external fiberglass "tool" box---]

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