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Thread: Power?

  1. #1
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    Question Power?

    I have been browsing and searching the forum for a while now and I am still confused on how to power my computer in the car. I am going to use my older computer, take out the stuff I dont need and make a smaller case for it.

    I am going to connect it to my kenwood KVT-911 tv/dvd but as far as powering the computer.......

    ....can I just use a power inverter using a relay to just cut the power to the inverter or will I need to use a shutdown module like many people are talking about. If I were to use an inverter and a shutdown module will the module cut the power to the computer or the computer and inverter?

    Thanks a lot for the help.....Eric

  2. #2
    ddt
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    Re: Power?

    Originally posted by eld101
    If I were to use an inverter and a shutdown module will the module cut the power to the computer or the computer and inverter?
    It will cut power to your computer... then to the inverter.. so both.

  3. #3
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    Do you know of any links to these? I would just wire it to my current power supply and the inverter?

    Thanks for the fast reply!

    Eric

  4. #4
    ddt
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    http://www.mastero.tk/ and click on cyber shop

  5. #5
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    I just got my opus power supply yesterday. It looks pretty sweet. I know there are a lot of people who don't want to spend $180, but I can't help but think of all the lost power that happens when people use two converters. One to go from 14.4VDC to 120VAC and then the computer psu converts it back to 12, 5, 3.3VDC. AC-DC converters are like %60 efficient (you would have two inefficient converters) whereas the DC-DC converters (like opus) are %90 efficient. Just my thoughts.....

  6. #6
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    I'm probably in a minority, but I need the inverter-solution since I want to be able to use the carputer as a cabin media jukebox as well. But then my system, with WLAN, XP Pro, Media Center 9 and 240 gig harddisk room with more than 30 000 MP3 files and a bunch of movies (but without a display as of yet) is probably not the norm...
    Tor - The MediaSUV

  7. #7
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    Right now I am leaning towards just getting an inverter. I know there will be wasted power in all of the converting from dc - ac -dc but Its definetly easier to get the inverter, and simply install a relay that will cut the power to the inverter to turn it off. Then when you hit the switch again, have it boot up.

  8. #8
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    I have two relays, one that is driven by the computer's 12 volt (yellow and black on a hard disk power cable) for regular operation and one connected to a button, so I can give the inverter power to power up the computer. I only need to push that button for half a second, then the PC driven relay takes over. That way the inverver looses power the second the PC is turned off. Sneaky, huh?
    Tor - The MediaSUV

  9. #9
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    I think thats a good idea....I know its not the best best way of doing it but it will save so much time and money. All I need to do is make a new case for my old computer, put the inverter on a relay and im set. I am planning on getting a kenwood kvt-911 which has all the input I need to its lcd screen and it will integrate with my cars current system.

    I was thinking about getting a wireless keyboard that has a trackball built into the side for control and then maybe for 100 bucks add a gps.

    If all goes right, this will cost me no more than 200 bucks!

  10. #10
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    Originally posted by ddogg_777
    I just got my opus power supply yesterday. It looks pretty sweet. I know there are a lot of people who don't want to spend $180, but I can't help but think of all the lost power that happens when people use two converters. One to go from 14.4VDC to 120VAC and then the computer psu converts it back to 12, 5, 3.3VDC. AC-DC converters are like %60 efficient (you would have two inefficient converters) whereas the DC-DC converters (like opus) are %90 efficient. Just my thoughts.....
    Incorrect on both counts. DC-AC is about 90% efficient, AC-DC is about 65% efficient. Your Opus is about 70-75% efficient (note that the Opus is about the only DC-DC that "claims" efficiencies as high as 90%, and it says "under optimum loads").

    An inverter setup really isn't all that less efficient than a DC-DC PSU... It is however a lot cheaper, but does tend to introduce a lot of noise into the system. Additionally the "wasted power" just comes from gas which equates out to pennies per hour of use.

    If you want to look at it purely from a monetary point of view, it is far cheaper to use an inverter than a DC-DC.

    Just FYI
    IN DEVELOPMENT -- '96 Mustang, lilliput with PII/450 laptop, custom DC-DC power supply, 60GB; Garmin GPS; 802.11g; compact keyboard, small graphical LCDs, OBDII.

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