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Power options for HP e-PC

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  • Power options for HP e-PC

    Hey, im new to all this and am researching the requirements to install an e-PC into my car. Ive read everything I can find on this site about power but am still just a little confused. My PC does NOT use a laptop style adaptor, it takes a normal kettle lead. When opened up, the power supply says its 12V (will post fuller info later if needed). So I guess its not worth using a power invertor if the power supply outputs 12V anyway right? So I wa thinking remove the power supply and replace with something else - just not sure how the connectors and stuff work out? Is there a Car power supply I can use to plug directly into the motherboard of one of these e-PCs or should I just use an Invertor?

  • #2
    What model e-pc is it? so your saying that the line that comes from the wall plugs directly into the e-pc?
    肚子笑痛了
    S60 Install

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    • #3
      Its a Compaq EVO D510 e-PC, little Silver PC which looks just like the e-PC 40. You can see a pic of one here: http://www.computeruniverse.net/products/e90060430...

      And Yes, The Kettle lead plugs from the Wall Socket directly into the PC....

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      • #4
        sdandeker,

        Your e-PC appears to have a power supply that connects to the motherboard thru a multi-pin Molex connector. Can you post some pictures of the label on the power supply chassis showing it's specs? If it truely only requires +12V to operate you can use the CarNetix CNX-P1290 regulator. This will give you the regualted power for your e-PC plus a startup/shutdown controller, plus a secondary +5V output for externally powered USB hubs.

        Here's the mobo power connector.
        Attached Files
        MikeH

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        • #5
          I will post the information on the power supply when I get home.
          So does this unit conenct to the existing power supply or does it allow you to remove the existing power supply from the equation and connect direct to the motherboard?

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          • #6
            So does this unit conenct to the existing power supply or does it allow you to remove the existing power supply from the equation and connect direct to the motherboard?
            The power supply that came with your e-PC is an AC to DC power supply. You would replace this AC/DC unit with the P1290, which is a DC to DC regulator. The P1290 converts the battery "+12V" input (which actaully varies from about 7.5V to 16V under various conditions, like engine cranking) to a stable, retulated +12V output at up to 6.3 amps (~75 watts). IF your existing AC/DC power supply ONLY provides +12V to you motherboard, then you can use the P1290 to replace it. You will need to find a mating Molex connector if you want to plug directly into the motherboard connector in the picture. The other thing you will need to do is track down how the ACPI signal works in yoru e-PC. A couple of my customers did this with an e-PC recently. If you search the forum for "e-PC" you should be able to find their thread.

            Let us know what you find on the power supply label. Hopefully it's +12V output at about 65 watts.
            MikeH

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            • #7
              OK, this is what I have on the Power Supply:

              MAXIMUM CONTINUOUS OUTPUT POWER IS 145W
              TOTAL COMBINED POWER ON +2V5 & +5V is 65W

              INPUT:
              100 - 127V ~ 4A
              200 - 240V ~ 2A

              OUTPUT:
              +12V 9A MAX
              +5V 7A MAX
              +2V5 12A MAX
              +5VSB 1A MAX

              Can i Still use the Power supply you quoted above? Does it allow me to connect the HD etc to it if I remove the existing supply?

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              • #8
                Wow....

                Sorry, I'm afraid I can't help you. In fact, I'm not sure where you would find a DC-DC solution for these requirements. What is a 2V5? Do you suppose it means 2.5V?

                At any rate, I would suggest your best bet is an DC-AC inverter. BUT, be careful. The AC input power looks to be around 450 watts (wow, that a pretty inefficient power supply...450W in and 145W out).

                Good luck!
                MikeH

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                • #9
                  Since im new to all this, are you able to explain to me what it is I need? Dont understand the info on the power supply so not sure what im after. After taking the e-PC apart, I found that the power supply connects to 2 different part of the motherboard....

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                  • #10
                    honestly for your situaton, I would either find a diffrent PC, or just use an inverter.
                    肚子笑痛了
                    S60 Install

                    Comment


                    • #11
                      Originally posted by MikeH
                      AC input power looks to be around 450 watts (wow, that a pretty inefficient power supply...450W in and 145W out).
                      Good luck!
                      How do you figure 450W?? The manual states that the PC only draws 70W max and an average of 50W, there's no way the power supply would be drawing 450W. I have the older HP e-PC 42 which is rated at drawing 120W max and an average of 45W, I'm running it with a cheap 400W inverter no problem.
                      1.6GHz HP e-PC, 768MB RAM, 120GB WD HDD, Slim DVD-ROM, Onboard sound & video, 7" Lilliput, USB GPS Mouse, Audiovox FM Modulator, Vector 400 Watt Power Inverter, Windows XP Pro SP2, iGuidance 2, 15" Samsung LCD for the rear *Carputer not installed*

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                      • #12
                        How do you figure 450W??
                        From his PSU specs...
                        INPUT:
                        100 - 127V ~ 4A
                        200 - 240V ~ 2A
                        MikeH

                        Comment


                        • #13
                          I understand Ohm's law but, I believe those ratings are what the power supply could pull, but with the PC only needing around 100W at most, it will never pull the full 4A. Just get a 400W or more inverter and you'll be safe, they're only like $40-$50.
                          1.6GHz HP e-PC, 768MB RAM, 120GB WD HDD, Slim DVD-ROM, Onboard sound & video, 7" Lilliput, USB GPS Mouse, Audiovox FM Modulator, Vector 400 Watt Power Inverter, Windows XP Pro SP2, iGuidance 2, 15" Samsung LCD for the rear *Carputer not installed*

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                          • #14
                            Alright, what Im trying to understand, is what motherboard I can salvage (I dont want to buy a new mini-itx unless I really have to!) Im not sure how you guys can tell whether I can use a DC-DC solution by looking at my power supply specs. An explanation would be much appreciated! I have got hold of another motherboard whose supply says:

                            Input: 100v-127v/8A
                            200v-240v/4A

                            Output: +3.3V +5V +12V -12V -5V
                            14A 22A 8A 0.8A 0.5A
                            +5V &3.3V max - 120W

                            Anyway I can use this without an Inverter?

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                            • #15
                              You might be in luck with that one, it was the 19V part of the e-PC power supply that pretty much prevents us from using any readily available DC-DC power supply.
                              1.6GHz HP e-PC, 768MB RAM, 120GB WD HDD, Slim DVD-ROM, Onboard sound & video, 7" Lilliput, USB GPS Mouse, Audiovox FM Modulator, Vector 400 Watt Power Inverter, Windows XP Pro SP2, iGuidance 2, 15" Samsung LCD for the rear *Carputer not installed*

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