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Thread: Unusual inverter noise problem

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    Unusual inverter noise problem

    When I first plugged my Sterling pure sine 150w inverter and turned on the computer there was an awful lot of noise. I subsequently grounded the case of the inverter to a common ground with the amplifier for my sub. Noise went 90% away.


    Question is, why cant I get rid of the rest of it . It also occurs when the computer is switched off and not even connected to the inverter !! It only occurs when the inverter is switched on. (out of interest I tried an RCA ground loop isolator when the computer was on and it made the noise worse !!!!!!!!)

    Any suggestions ? I think I 'm going to try a different ground to the sub, maybe thats whats causing the interference
    145 watt micro-atx power supply
    LV-670M motherboard
    1.7 mobile pentium
    600w pure sine wave inverter
    250gb hard drive

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    Try this: Turn off the computer and disconnect the inverter. Did the noise go away? If so, the noise is being generated by the inverter itself and I'm not sure of any solutions to this problem other than switching to a DC-DC power supply intended for Car PC use.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
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    lez
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    move the inverter to the front of the car and use very short thick wires on it, connect direct to batter, use a long 110v/220v wire

    long DC leads cause hell

    Does that make any difference?

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    Its definately being generated by the inverter. Can you get anything to put in position between the inverter and cigarette socket that will take away the noise ? Not willing to get a dc-dc supply as I need to bring the computer into the house frequently. Before when I had an opus it was too much hassle. Now the car computers working perfectly with the inverter and I dont want to fiddle with it.
    145 watt micro-atx power supply
    LV-670M motherboard
    1.7 mobile pentium
    600w pure sine wave inverter
    250gb hard drive

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    Self proclaimed spoon feeder TruckinMP3's Avatar
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    Quote Originally Posted by launter
    Its definately being generated by the inverter. Can you get anything to put in position between the inverter and cigarette socket that will take away the noise ? Not willing to get a dc-dc supply as I need to bring the computer into the house frequently. Before when I had an opus it was too much hassle. Now the car computers working perfectly with the inverter and I dont want to fiddle with it.
    you should not be getting your inverter power from the cig. socket.
    Run power from the battery. This has been covered in ecery thread about noise and power.
    TruckinMP3
    D201GLY2, DC-DC power, 3.5 inch SATA

    Yes, you should search... and Yes, It has been covered before!

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    Maximum Bitrate DeltaFX's Avatar
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    Quote Originally Posted by launter
    When I first plugged my Sterling pure sine 150w inverter and turned on the computer there was an awful lot of noise. I subsequently grounded the case of the inverter to a common ground with the amplifier for my sub. Noise went 90% away.
    [...]
    Pure Sine ? that's just its brand name, uh ? Not related to any real sinusoïdal signal shape ?

    Real pure sine inverter usually cost twice the price of a opus 150W...

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    http://www.sterling-power.com/htm/do...pdf/i150gb.pdf

    Definately a pure sine inverter as above and a well recommneded one over here in UK. Inverter cost £80, opus cost me £150. Inverter allows me to take the computer into the house without faffing with wires and I can also use the inverter for other stuff in the car such as my mini fridge. It also monitors the battery as the opus does. Didn't want the ignition to control the computer would rather have a button. Opus holds no advantges for me except noise.

    Didn't think the cigarette lighter thing was a big issue, firstly because its only 150w and the wire can take that load and haven't seen any posts that tell you not to use the cigarette lighter just for the noise issue. Its not an alternator whine because it still does it without the car running and definately not from the computer because it does it when the computers not even connected. Definately coming purely from the inverter. Will try the connection direct to the battery but would prefer not to because of the wiring hassle. I guess a direct connection and making sure the power wires are at a good distance from the speakers and their wires is the best thing.
    145 watt micro-atx power supply
    LV-670M motherboard
    1.7 mobile pentium
    600w pure sine wave inverter
    250gb hard drive

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    Quote Originally Posted by launter
    Its definately being generated by the inverter. Can you get anything to put in position between the inverter and cigarette socket that will take away the noise ? Not willing to get a dc-dc supply as I need to bring the computer into the house frequently. Before when I had an opus it was too much hassle. Now the car computers working perfectly with the inverter and I dont want to fiddle with it.
    Well it's not working perfectly, is it? You've got noise in the audio line.

    If you bring it into the house frequently, you should buy an AC-DC 10 amp power supply for the house. Then use the Opus for the car and a connector on the Opus. Make a similar cable for the house DC power supply.

    When you need to bring it into the house, unplug the connector from car and plug it into the cable in the house.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

  9. #9
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    Quote Originally Posted by Bugbyte
    Well it's not working perfectly, is it? You've got noise in the audio line..

    I knew someone would come up with that one sooner or later

    I realise everyone loves the opus it just wasn't right for me . Your suggestion sounds like good one however its a little late as I've sold it. Didn't know how to encorporate the "remote" wire the opus needs into a dc connector otherwise I might have tried it at the time. The inverter has made things a lot simpler and if all else fails I'm willing to put up with the noise.
    145 watt micro-atx power supply
    LV-670M motherboard
    1.7 mobile pentium
    600w pure sine wave inverter
    250gb hard drive

  10. #10
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    usually, inverters operate at 60 hertz or 50 hertz. this frequencies are considered audible. that is why most inverters usually produces humming sound. this is often called as noise. in reality, noise can never be eliminated but can be minimize. there are many ways of reducing. one way is by adding a filter circuit. shielding and isolation are other types of methods. this methods is hard to accomplish and cost a lot of time and money.

    if you really want to have a less audible noise, try using a dc to dc converter in your system. they usually operate at a higher frequencies like 60KHz or higher. they produces noise that less audible to human ears.

    if not, try to add a filter circuit to your audio devices.

    **i presumed that ur talking about the noise produced by the speakers.

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