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Thread: Inverter Question

  1. #21
    Maximum Bitrate VanMan69's Avatar
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    Good point. Check the gauge of the wire.
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  2. #22
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    Quote Originally Posted by VanMan69
    Okay... now that we've gone through all that nonsense... here's what *I* think the problem is.

    Does the inverter whine when you have the engine running? If it does, you've got a different problem then what I'm thinking of. But if the inverter is okay with the engine running, and you're saying the inverter whines after 15 minutes with the engine OFF, then I think I know your problem:
    O nono, I know its the inverter because I get my ear down to the inverter and listen for the sounds it makes, its comin from there alright, then when i turn the button to Off the noise is gone thats why I think its the inverter

    Quote Originally Posted by strohmrs
    I agree that the noise he is most likely talking about is "audible" noise from a low voltage alarm in the inverter and not "electrical" noise from the alternator. You said you have the inverter wired up with 4m of wire. What gauge? If it isn't a low enough guage then you will have quite a voltage drop (and fire hazard) by the time it gets to the inverter so your battery may be ok. Ground the inverter to a good point in the truck instead of to the negative battery terminal.
    I made sure that the gauge of the wire connection is the same as the ones provided by the inverter (gauge of the clamp wires)
    When i say 4m of wires, I do mean 4 meters of wires, yes its quite long because it has to stretch from the battery to the trunk going through firewalls and bending here and there under carpets and stuff.

    Thanks for all the help though, this has been very very helpful. I'm also getting some static noice from the *ahem* fm modulator that I'm using maybe its because all my wires are clamped into one stack (signal and electrical) and then all to the trunk, but I just put everything back together and it works great! u guys telling me i have to pull all that out just to test if the electrical wires is interfering with the audio signal wires? uh o.... do you guys think it has anyhting to do with the sound card? because in a certain umm base level it will get a great amount of static where as some with no static. All these stuff is driving me

  3. #23
    Constant Bitrate strohmrs's Avatar
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    As you increase the length of the wire you need to go to a larger gauge wire to compensate for the increase in resistance for such a long run. The shorter wires that come on most of those inverters are usually at the thin end of the exceptable gauge. I would beef up that main power wire and choose a good ground in the truck as close to the inverter as possible.

    There isn't really too much you can do to make FM modulators sound better. The wireless ones are the worst. They really suck for static and general audio quality so you may not notice any improvement by rerouting your cables. A ground loop isolator made my wired modulator much more acceptable to listen to.
    Rick S.

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  4. #24
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    what nonsense?

    Quote Originally Posted by VanMan69
    Okay... now that we've gone through all that nonsense... .

  5. #25
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    if it really is that low voltage alarm that your talking about and not noise coming through the system then i totally misunderstood your post..that feature is in the manual so i would never think thats the issue... and if a ground loop isolator doesnt help (hey your using an FM modulator...it can only make it better ) and really as a last resort if your handy with a soldering iron u can always try to add caps and a bridge to the DC side wires of the computer PS...it has helped me when using battery chargers and batts on audio equipment so it should help here as well....

    Kevin

  6. #26
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    Quote Originally Posted by strohmrs
    As you increase the length of the wire you need to go to a larger gauge wire to compensate for the increase in resistance for such a long run. The shorter wires that come on most of those inverters are usually at the thin end of the exceptable gauge. I would beef up that main power wire and choose a good ground in the truck as close to the inverter as possible.

    There isn't really too much you can do to make FM modulators sound better. The wireless ones are the worst. They really suck for static and general audio quality so you may not notice any improvement by rerouting your cables. A ground loop isolator made my wired modulator much more acceptable to listen to.
    I will definately give the ground loop isolater a try, nothing can go wrong witha $20 investemtn!

    Quote Originally Posted by TundraT3
    if it really is that low voltage alarm that your talking about and not noise coming through the system then i totally misunderstood your post..that feature is in the manual so i would never think thats the issue... and if a ground loop isolator doesnt help (hey your using an FM modulator...it can only make it better ) and really as a last resort if your handy with a soldering iron u can always try to add caps and a bridge to the DC side wires of the computer PS...it has helped me when using battery chargers and batts on audio equipment so it should help here as well....

    Kevin

    nono u were a lot of help and you got me right, it was never the alarm, as I've mentioned earlier! I am actually quite handy withthe soldering iron but am scratching my head as in what u mean by the "caps and a bridge to the DC side"

    the reason why i've decided to use a modulator is because I dont' feel like spending another $300 on a moderately nice deck only to use it for AUXin, I have all the features i need already in the computer, no need to waste extra money (ya i'm a cheapo )

    Just saying this again, all of your inputs are very helpful and I appreaciate all your help! (expecially Kevin here )

  7. #27
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    glad to know i helped....a bridge is a rectifier bridge...4 diodes that form a full wave rectifier...used in conjunction with smallish capacitors u can greatly filter noise on your DC lines...
    Kevin


    Quote Originally Posted by phatchink
    I will definately give the ground loop isolater a try, nothing can go wrong witha $20 investemtn!




    nono u were a lot of help and you got me right, it was never the alarm, as I've mentioned earlier! I am actually quite handy withthe soldering iron but am scratching my head as in what u mean by the "caps and a bridge to the DC side"

    the reason why i've decided to use a modulator is because I dont' feel like spending another $300 on a moderately nice deck only to use it for AUXin, I have all the features i need already in the computer, no need to waste extra money (ya i'm a cheapo )

    Just saying this again, all of your inputs are very helpful and I appreaciate all your help! (expecially Kevin here )

  8. #28
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    Quote Originally Posted by TundraT3 View Post
    ...you probably using a cheap chopped DC version like the mainstream Vectors...they make the inverters for nearly everybody..radio shack, husky, etc. etc...
    Kevin
    New to this forum and a search on my problem, noise with power inverter, brought me here. I think I have one of the cheap ones you mention above. I'm wondering if you can recommend a good cigaretter lighter power inverter? Also, after reading the posts I decided to purchase an AC/DC adapter from my computer manufacturer (IBM) so that I don't have to go through the inverter process. Should this get rid of the noise? I still am interested in the well made power inverters for other gadgets that are not DC.

    Thanks,
    Nick

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