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Thread: Inverter noise.

  1. #1
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    Question Inverter noise.

    No, this isn't about normal noise caused in the sound by an inverter,
    I have a 600watt inverter and it has a fan in it. I had to have it somewhere close, so I could turn my computer that is plugged into it on, and off.
    So, I put it on the hump between my seats.
    But, the fan is rather annoying. Its not bad when I'm listening to music, as that covers the sound up, but its annoying when its off.
    I really don't want to move it, as since its 600watt, I can't run the wires that far.
    I would like to put it in the trunk, but then would have no way of turning it on and off.
    I may switch to a DC-DC inverter, but am rather afraid to mess with electric stuff.
    Does anyone know where I can get plans for a AT DC-Dc inverter, and how much it would cost to build?
    Thanks
    Clarion 200watt head unit w/ Aux in.
    Kicker 800watt 4 channel amp
    In a 96 Grand Prix SE.

  2. #2
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    Post

    Put your inverter in the trunk and then run the on/off switch from your computer case to your dashboard. Or somewhere close to driver seat.

  3. #3
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    Or even simpler, get a relay and hook it up to the positive cable of the inverter. Then run a wire from your lighter plug to turn the relay on and off. Then you can stick the inverter somewhere behind some paneling, pack some sound deadener in there if you want and the inverter will turn on and off on it's own.
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  4. #4
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    600 watts can be run to the trunk no problem. I used 10 gauge cable for my inverter which is probably overkill. I have a small toggle switch on the dash connected to a relay (located under the hood with the fuses to turn the inverter on and off. works great. better than turning the inverter on and off at the switch.
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  5. #5
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    You guys aren't listening!
    I have a 600watt inverter!
    Lets see you find a Toggle switch for 4 gauge wire!
    And, I can't leave it constantly running, as it will wear down my batteries.
    I do have a long wire ran for my computer on/off, but I just leave it on plugged into the inverter.
    Plus, 4 gauge wire is expensive, and a pain in the butt to run, But does someone know
    where I could get a Toggle switch for 4 gauge wire?
    What exactly does a relay do?
    That sounds like it may work?
    How much do they cost?
    Clarion 200watt head unit w/ Aux in.
    Kicker 800watt 4 channel amp
    In a 96 Grand Prix SE.

  6. #6
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    This has been gone over MANY times.

    600W @ 120VAC = 5 Amps

    So the 12 volt draw will be about 50 Amps. This can be easily handeled by a 8-10 gague wire. Furthermore, you will prolly never draw the full 600 watts. If all you are doing is running your computer, which even at startup will only draw at max 100 watts, then you need not worry about using 4 gague wire. If you still want to run the cable using 4 gague, then you can use a relay.

    To answer your earlier question, a relay is a device that can switch a large current cable using a VERY low current signal line. A high current relay can be ordered through radio shack for 2.99 Cat# 900-2394. This is a 30A relay which will work fine for what you are using it for. (I'm guessing)

    As for the inverter running down your battery if you leave it running, This is simply not the case. An inverter will only draw as much power as it needs. There is a little bit of power used internally by the inverter, but it is not enough to worry about in my experience.

    and if you want to have a switch control the power there are many available also from radio shack. As for connecting to a 4 gague cable it is all in the crimp connector you are using. And yes, they do make them.

    Hope this info was useful.
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  7. #7
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    Exclamation

    I am having a slight problem with this also, I am running only a 350w inverter, the noise isn't bothering me, but I am having problems with the power, I want the inverter to turn on when the car starts, and cut off when the car stops. I heard you guys talking about a relay, and I am not sure what that is, please repsond back.

    Thanks,

    Jack Mode

  8. #8
    Retired Admin Aaron Cake's Avatar
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    Cool

    Relay
    A relay is an electromagnetic switch. Applying current causes the electromagnet to become active and pull the contacts together. On the schematic, the electromagnet is the part of the symbol that looks like half a transformer or inductor. The contacts are right beside (or above or below) the coil. These contacts can take on any of the normal switch configurations. Pictured here is a simple SPST (or Single Pole Single Throw) relay. This means the the Relay contains one set of contacts and can only be switched one way (on or off). Other types of relays include SPDT (Single Pole Double Throw-A relay with one contact that can be toggled both ways), DPST (Double Pole Single Throw-A relay with two contacts that can only be on or off) and DPDT (Double Pole Double Throw-A relay with two contacts that can be toggled both ways).
    Go to http://www.aaroncake.net/electronics/schem.htm and look in the "Sound, Light, .......misc" section for more info.
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  9. #9
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    So would this work for my car, and where would I rehook the switch, (the remote?) I am still confused if you havn't noticed. I just do not understand how? I have my power and ground, and then the switch that turns the inverter on and off, I rewired the switch so that it is too wires now, so what is my next step, hook the relay up to my remote on my cd player and amps? Help a first timer.

    thanks,

    Jack Mode

  10. #10
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    Right. You can use the remote wire off of your cd player to trigger the relay. For example if your inverter draws (at most) 30 amps, and your cd player's remote turn on wire provides 12v, then you'd use a 12V 30 amp relay. This means the relay's coil is related for 12V and the contacts are rated for 30 amps. For your purposes a SPST relay will work fine.

    Wire it like this: (not sure this will look right on all or most browsers)
    <pre>
    12V from battery
    (using fuse and heavy gauge wire)
    o
    |
    Turn on wire_______o |
    | |
    relay coil 8 \
    | \
    GND_____________o |
    |
    |
    o
    12V input on
    the inverter </pre>

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