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Thread: Inverters...

  1. #1
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    Question Inverters...

    I was just curious, are there any problems / cons with using a 12voltDC to 110vAC Inverter and a standard ATX power supply as opposed to a DC-DC power supply? For one, it would be about 1/3 the cost for twice the wattage...

  2. #2
    Retired Admin Aaron Cake's Avatar
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    Cool

    Problems:
    -noise
    -inefficiency
    -size
    -heat

    Advantages:
    -lower cost

    DC-DC is the way to go.

    ------------------
    Aaron Cake
    London, Ontario, Canada

    Player: Cyrix 200, 32MB RAM, 10.2Gig Quantum HD, Onboard EtherNet/Sound/Video, Custom Lexan Case, Arise DC-DC, Win95 Kernal w/Custom Player
    Car: '86 Mazda RX-7 w/Basic Performance Upgrades
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
    Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."

  3. #3
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    I dont think the heat size and inefficiency would be a problem for me.
    they aren't too big to fit under a car seat. They wont heat up enuff to burn u (the good ones have fans) the inefficiency wont kill ur battery, and i have heard of DC-DC to have had noise too. Spend 5.00 on a heavy duty ground loop isolater and it should eliminate any noise. Also the DC-DC's u have to make, which requires time, and anyone with good knowledge about money knows that that: time=money.

  4. #4
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    Not to mention that with an inverter when you need to work on the computer you can simply take it out and plug it into an outlet in your house.

  5. #5
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    I dont think the heat size and inefficiency would be a problem for me.
    they aren't too big to fit under a car seat. They wont heat up enuff to burn u (the good ones have fans) the inefficiency wont kill ur battery, and i have heard of DC-DC to have had noise too. Spend 5.00 on a heavy duty ground loop isolater and it should eliminate any noise. Also the DC-DC's u have to make, which requires time, and anyone with good knowledge about money knows that that: time=money.

  6. #6
    Retired Admin Aaron Cake's Avatar
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    Cool

    You don't have to make a DC-DC. Arise Computer (http://www.arisecomputer.com I think) has them for sale.

    If you want to power a DC-DC powered computer in the house, just use a 12V power supply good for about 5A. Works great. An old computer power supply will work.

    ------------------
    Aaron Cake
    London, Ontario, Canada

    Player: Cyrix 200, 32MB RAM, 10.2Gig Quantum HD, Onboard EtherNet/Sound/Video, Custom Lexan Case, Arise DC-DC, Win95 Kernal w/Custom Player
    Car: '86 Mazda RX-7 w/Basic Performance Upgrades
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
    Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."

  7. #7
    FLAC
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    Upper Marlboro, MD 20772
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    Aaron Cake: They just don't understand stand until they get one of those arisecomputer PSU. I have 3 of them already. I can power up my box from a +12v of a regular psu. I don't see why go from DC->AC->DC... ppl think about it, does that make sense?
    looks like only me and Aaron Cake has these psu and are enjoying it.

    abcd-1
    abcd-1
    Author of CobraI,II,III and now CobraIV.
    You can contact me on AOL instant messenger....nick is cenwesi or cenwesi3

  8. #8
    Variable Bitrate Cyberphox's Avatar
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    My order is going in for one for sure
    DC-DC rocks!
    Technology, Gadgets and Making Money Online
    http://www.genemills.ca

  9. #9
    Maximum Bitrate
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    Lets put it this way...
    The people who know enough electronics will never go for the inverter cos of the problems Aaron Cake mentioned. And who ever works in the industry of electronics and computers will know that design (of anything at all) should be as reliable, most efficient and solve most of the problems that encountered.

    So the inverters are the easy way out for those who dont really think about the problems mentioned above. But most the people here who had the mp3 players running in their cars for few years now can tell that DC converters are the best solution in-car conditions.
    From the engineering point of view, there is no point of converting the DC to AC then converting it back to DC again... Its just NOT efficient!!
    I personally started with home made inverter more then a year ago but soon after was thinking of replacing it with DC converters, as i did.
    Belive it or not i end up saving 7Amps of current draw from my battery which also means loger battery life when the car is off.
    At the moment the DC converter uses 3amps Max power to run the whole system (which is more than 90% efficient). After changing from the inverter to DC converter it also made it possible to reduce the size of the MP3 player box from 40cmx35cmx10cm to 23cmx24cmx7cm.

    So looking at the facts its up to you to decide which way you want to go!

    ------------------

    Fosgate
    Fosgate

    System Comp V3 - In progress.
    Low power MB with C7 CPU, DC-DC PSU, car ECU link, USB TV, GPS, 7" TFT, Wireless, Voice.

  10. #10
    Newbie
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    Sep 2000
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    2

    Question

    Inverter ppl
    are you running a 120VAC line in the same chase or whatever as any of the 12VDC wires are ran... exspecially speaker wire and its like?


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