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Thread: Wiring Inverter Parallel to Amp

  1. #1
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    Wiring Inverter Parallel to Amp

    currently i got a MTX RT202 amp in my car which is pose to be 50watts rms per channel so im guessing thats a 100watts. im using the walmart brand 300watt amp wiring kit. i just bought a 500watt vector inverter to power a xbox which is suppose to be 100watts and a lilliput lcd which im gonna power using the hard drive molex connector inside the xbox to give it a clean 12v connection. now i was wondering if i could just buy like two 1ft 10ga wire or 8ga and just connect it parallel to the amp and if i have to change the 30amp fuse. or do i have to run another 8ga cable from the battery to the trunk?
    thanks

  2. #2
    Stank Cheese n8scstm's Avatar
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    watts = amps * volts
    Use that to figure out what size fuse to use. Make sure your using the surge watts (max) for the inverter and not the normal watts. Surge is usually double the normal. So if you have a 500 watt inverter, it's probably 1000 watt surge. That alone is 83 amps. Of course thats at full power. But you dont want to design the system half ***. Youve got the power so design for it, it will make upgrades in the future much easier. Speaker watts are different than power watts. If your amp puts out 50 watts to 4 channels, that doesnt mean your using 200 watts. Its actually lower than that. Im not sure how much but to be safe you could just use the 200 watt figure, just know that its not what youll actually be using. The wire will depend on how far your running it. Here is a table to help you figure the wire gauge. You'll need at least 4 gauge. Use 2 gauge if you plan on going more than 8 feet. Dont run 2 wires. Its sloppy. Use one good wire and run it into a fused distribution block. That way you will have a main fuse at the batterey and individual fuses for each device at the other end. This is the dist. block that I used and it works good.
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    will i still need to use a in-line fuse holder near the battery in combination with the distribution block? oh and is there anything wrong with wiring the remote acc wire parallel to the amp?

  4. #4
    Stank Cheese n8scstm's Avatar
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    You always, always, always, always, need a fuse or at least a circuit breaker as close to the battery as possible. Lets say you have a 10 foot wire from the battery to your dist. block. The wire rubs on the frame and wears through the insulation. Now what happens? Battery blows up and catches fire. Trust someone who has been there. And it was my moms car. She wasnt happy and I had to spend a lot of money to fix it not to mention the burns I got from grabbing the flaming, melted wire and trying to yank it off of the battery. I'm not sure what you mean by wiring the acc. line "parrallel" to the amp.??? PLease explain.
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  5. #5
    Maximum Bitrate mushin's Avatar
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    You still want to be fused at the battery, unless your distribution block is very close to the battery. Basically any length of unfused (or inproperly fused) wire poses a fire hazerd if it shorts, so you want to minimize it. You don't actually need fuses at the distribution block *if* the wires from the block can handle the current the at-battery fuse will let through. It might be cheaper to run oversized wire all the way, depending on the size and distances involved.

    edit: got distracted and n8scstm beat me to it . I think by acc line in parallel, he means pulling the turn-on signal from the same place. It's always better to not run redundent wiring, but I don't think it's critical if you run these in parallel (though why not just tap the line at the end of the first wire, rather than at the beggining?)

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    heres a ghetto drawing the blue line is the basically acc or igniton on wire, so when i turn off the car the amp wont drain my battery. i wanted to add a relay to the inverter and then wire the acc wire to the relay so it would also not drain the battery when the car is off. and the acc wire is ran from the headunit to the trunk where the inverter and amp is in. so is it ok to run it like the pic or should i get a small distributon block for that wire. and i dont think i need a distributon block for the ground wire do i? the ground wires are running to the car's chassis
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  7. #7
    Stank Cheese n8scstm's Avatar
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    The way you have the pic is good. You can wire the acc. wire just like that. You also dont need a dist. block for the ground. Just ground to a close point on the chasis. I like to use fused dist blocks because it provided better protection for your devices. It's not critical though because as the other post said, If the wire can handle it, it wont be a hazard.
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    Constant Bitrate csnowman00's Avatar
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    Red face

    Even though wiring the inverter to the amp (either by a dist. block or wiring it in parallel) i dont recomend it, unless you install a capacitor (a 1F would do nicely). When your amp hits, i could draw a tremendous about of current, robbing it from your power supply to your pc...power surges and drains are not good for computer power supplies and may shorten its life. installing a capacitor would smooth out all the surges and drains, making it a perfect 12V, which is very, very good for your PC
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    Constant Bitrate csnowman00's Avatar
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    Wink

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  10. #10
    Stank Cheese n8scstm's Avatar
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    The inverter should take care of this for him. At least mine does. Plus I don't think his amp is large enough for that to be an issue. It's only 100 watts to the speakers. It surely can't draw too much power.
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