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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
    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.
    2.4 celeron
    150 watt OPUS
    micro atx
    xp pro
    tv/radio tuner card
    audigy
    Dual monitor Radeon
    802.11G Mimo
    xm pcr
    dvd
    gps
    8" Lilliput touch screen
    IGuidance
    dual optimas
    battery isolator
    15" screen
    My Truck

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    • #3
      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?

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      • #4
        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.
        2.4 celeron
        150 watt OPUS
        micro atx
        xp pro
        tv/radio tuner card
        audigy
        Dual monitor Radeon
        802.11G Mimo
        xm pcr
        dvd
        gps
        8" Lilliput touch screen
        IGuidance
        dual optimas
        battery isolator
        15" screen
        My Truck

        Comment


        • #5
          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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          • #6
            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
            Attached Files

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            • #7
              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.
              2.4 celeron
              150 watt OPUS
              micro atx
              xp pro
              tv/radio tuner card
              audigy
              Dual monitor Radeon
              802.11G Mimo
              xm pcr
              dvd
              gps
              8" Lilliput touch screen
              IGuidance
              dual optimas
              battery isolator
              15" screen
              My Truck

              Comment


              • #8
                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
                Current Progress:
                [▓▓▓▓▓▓▓---]80%
                Final Assembly

                Ramline P3 PC
                10.4 inch Touchscreen
                Windows XP Embedded
                Road Runner
                http://www.projektnepa.com
                Electrical Engineer / Mobile DJ

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                • #9
                  I can do paint too
                  Attached Files
                  Current Progress:
                  [▓▓▓▓▓▓▓---]80%
                  Final Assembly

                  Ramline P3 PC
                  10.4 inch Touchscreen
                  Windows XP Embedded
                  Road Runner
                  http://www.projektnepa.com
                  Electrical Engineer / Mobile DJ

                  Comment


                  • #10
                    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.
                    2.4 celeron
                    150 watt OPUS
                    micro atx
                    xp pro
                    tv/radio tuner card
                    audigy
                    Dual monitor Radeon
                    802.11G Mimo
                    xm pcr
                    dvd
                    gps
                    8" Lilliput touch screen
                    IGuidance
                    dual optimas
                    battery isolator
                    15" screen
                    My Truck

                    Comment


                    • #11
                      okay yeah i didnt look at the size of the amp, i have a 550 watt and it definatley affects my inverter, even though the wire size is rated for a 550-1000 amp
                      Current Progress:
                      [▓▓▓▓▓▓▓---]80%
                      Final Assembly

                      Ramline P3 PC
                      10.4 inch Touchscreen
                      Windows XP Embedded
                      Road Runner
                      http://www.projektnepa.com
                      Electrical Engineer / Mobile DJ

                      Comment


                      • #12
                        couple questions:

                        1) is a fuse box essentially the same as a distribution box? (doubt it)
                        because considering my carpc will be replacing the stock headunit anyhow, i was just going to wire it straight into the radio's wiring harness (going to need to anyhow to use the stock amp for sound)

                        2) our van has has a fuse box in the engine compartment for larger fuses like the ABS system, etc.., would this be a good sign of their being a suitable fuse wired up near the battery?
                        Your everyday carpc geek and tech guru at your service. *bow*

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                        • #13
                          help me help you

                          im not really a car audio guru but i know some things about electronics...............does the distribution box your using do anything besides splitting a wire if so what are its functions?

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