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Thread: BEST way to power up an HP E-PC???? HELP

  1. #21
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    Since this post has resurrected, I might as well use it. Is it possible to use the Mobo Commell LV-677 in the HP E-PC case? Are there any other Mobo that fit this case? thanks

  2. #22
    Newbie Brent25's Avatar
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    Hey guys sounds like this threads a bit old but i am using an e-pc with the in-car laptop power supply. Ive had no problems at all. I just wired to acc. power so i just kill the power without shutting down and when i turn the ignition back on it boots itself up again. I know its dodgy but XP has had no problems so far and ive been running it for about 6 months.

    By the way does anyone have a spare case or even just the internal chassis for these pc's? I "modified" mine to bolt into my glovebox and now want to put it back in the case as im upgrading to a P4...

  3. #23
    Newbie Seeking_S13's Avatar
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    Try putting a 2.5" Drive in there (Runs off 5v) and powering it straight off 12v
    Thats what I do and it works briliantly, survives crank and all!
    Cant use any 12v devices tho as the 12v rail drops to 10ish volts...
    No laptop power brick or inverter needed!
    Car: 1990 Nissan Silvia, CA, Man, Red, Sunroof, HUD, 90mm Turboback Exhaust, Pod Filter, NEW T28BB,
    9Psi + Broken timing belt :(
    Audio: JVC G515 HU, Clarion 6.5" Splits, Pioneer 6x9's Rear, 4x50RMS AMP
    Carputer Progress: Now 100% SOLD :(

  4. #24
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    time to resurect this thread. Do most of you shutdown your e-pc when your car is off? My battery has died like four times. I think it might be time to invest in a second battery which leads to another question. If i do, I plan to have a relay connect the second batt and carputer when the ignition is on. How do i determine how many amps the relay I am going to use should be?

  5. #25
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    What kinda of car adapters are you guys using for you e-pc? Any certain brands better?

  6. #26
    Variable Bitrate billmee's Avatar
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    Quote Originally Posted by AllShowNoGo View Post
    time to resurect this thread. Do most of you shutdown your e-pc when your car is off??
    I turn off the pc if I know that I'll be away from the car for more than 20 minutes.

    Quote Originally Posted by AllShowNoGo View Post
    My battery has died like four times. I think it might be time to invest in a second battery which leads to another question.
    Good idea.


    Quote Originally Posted by AllShowNoGo View Post
    If i do, I plan to have a relay connect the second batt and carputer when the ignition is on. How do i determine how many amps the relay I am going to use should be?
    My epc-40 + liliput 7" + inverter draws 90 watts peak.
    90 watts can be as high as 10 amps when cranking. ( 90w/10volts = 10amps)

    I use a relay rated at 15 amps to isolate my 2nd battery from the 12volt accessory supply. I'd suggest a bosch type relay available from most autopart stores for <$10 they are rated for 30A.
    looka this http://www.the12volt.com/relays/relays.asp

    Some specs, components;
    12v 7AH Sealed lead acid battery fused at its positive terminal.
    SPDT Relay ; coil energized by my tail light,(this is my only isolation, no diode)
    Tripplite 375 watt inverter ; power switch extended to dash mounted switch
    EPC-40 PSU
    EPC-40 running XP home and RR.

    Operating notes.
    From the drivers seat I can press the power switch for the inverter.
    Choose to run off the cars electrical system or just off of the second battery by turning on the headlights. I like this solution because it provides an audible warning if I leave the headlights on and try to leave the car.
    The 7 AH battery will give me 30-45 minutes of run time.

    This config is about a year and a half old and has given me no trouble.
    I was careful to measure the power drawn by the pc and choose components accordingly.

    I might upgrade to a larger battery in the future and will definately add a 110vac to 15vdc psu to charge/power the system when I'm parked overnight in the garage.

  7. #27
    Variable Bitrate billmee's Avatar
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    Quote Originally Posted by TalonTsiAWD View Post
    What kinda of car adapters are you guys using for you e-pc? Any certain brands better?
    What do you mean ? Software, hardware, power, audio ??

  8. #28
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    Thanks for the info Billmee. I've got a few 30A bosch relays laying around somewhere. How did you determine the size of the relay you need? I have a bunch of those sealed gel cell batteries but if they only last 20-30min each, i think i'm going to go with another full sized car battery. The thing that sucks is that i have alot of those batteries and i have the perfect spot to hide them.

    Talon - I'm guessing you are refering to power adapters. I tried a kensington laptop adaptor that was able to deliver 4 amps @ 18v (was able to change the voltage with different "chips". The problems with that one was it shut off when i start my car and it drew ALOT from my battery.

    I also tried a 65w targus adaptor. It was less than a half inch thick, supplied multiple voltages at once and the output was rock solid even when the input voltage was eight volts. The only problem was it shut off when i tried connecting the epc to it. It wasnt able to supply enough power.

    Right now I have the epc powered directly off of the car. It survives engine starting about 50% of the time. Out of curiosity, would a capacitor close to the computer help this at all?

  9. #29
    Variable Bitrate billmee's Avatar
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    Quote Originally Posted by AllShowNoGo View Post
    Thanks for the info Billmee. I've got a few 30A bosch relays laying around somewhere. How did you determine the size of the relay you need? I have a bunch of those sealed gel cell batteries but if they only last 20-30min each, i think i'm going to go with another full sized car battery. The thing that sucks is that i have alot of those batteries and i have the perfect spot to hide them.
    If you decide to use a full size battery you are going to have to chuck most of my suggestions.

    You will gain a lot of run time but you are taking it to the next level.

    Plan on running a dedicated low gauge wire from the first battery, either a tank circuit or a true isolator. Search for tank circuit and second battery to get more details. Good luck and have fun

  10. #30
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    At the moment I dont see me being able to run the EPC 24/7. When i boot the machine it gives me errors about the mouse/keyboard not being plugged in. I took the circuit board out of a keyboard and the keyboard error went away. if i simply attach a usb to ps/2 adapter, would that solve anything? I tried an adapter that allows you to connect ps/2 keyboard and mouse into a usb port and the computer still gave me an error.
    1997 Grand Prix GTP - Pioneer Premier HU - Alpine 4ch for mids/highs - McIntosh separates in the rear (soon to be in front as well) - Custom Passive Xovers - Pioneer Class A 300wrms amp - 2.5 farad cap - The original RF "The Punch" Pro Series 12"

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