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Thread: power question

  1. #1
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    power question

    I had a question about powering my car pc. I asked before, and got the power calculator, but I'm not sure which is mine. I am a big newbie. anyway, I have a 7 inch lilliput 629 screen, and a hp minipc. specs are 933mhz, 20 gig hard drive, cdrom, and 256m of memory. I decided my best course of action is to hardwire an inverter, but simply, I'm not sure how big of an inverter I need to power the screen and pc. can anyone help me out, and chime in with how big of an inverter would be needed to power both these items? thx in advance guys

  2. #2
    Maximum Bitrate redls1bird's Avatar
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    A 400 watt inverter should take car of business, ive done some serious powering with one. Why do you think you need an inverter though? Are you worried about the dc-dc converter being to complicated? Or think its just not capable of powering your system? A good basic way of determining the size you need for power is using your factory power supplies spec to figure it out. Mine for instance is only 100w. I dont use powered usb hubs or anything else. That way i know if my factory psu can handle the load, then the m2-atx dc-dc i plan on buying that has more output on every line can too.
    Car Pc progress meter:
    [-5%-------------------] Carpc build #2. So far, 20$ deep! I love recycling!

    "The car is the closest we will ever come to creating something that is truly alive" -Sir William Lyons
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  3. #3
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    I'd try and stay away from an inverter if at all possible.

    They are noisy, inefficient, noise inducing to the audio system, and introduce unnecessary conversions.
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  4. #4
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    well, if I stay away from the inverter, what power supply do u guys suggest that will handle the load? I'm a little confused on what's best to power my carpc

  5. #5
    Maximum Bitrate redls1bird's Avatar
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    The problem is you dont even know what your load is. Power supplies and their designs/uses/benefits/downfalls are one of the most covered topic on this forum. Apply yourself.
    Car Pc progress meter:
    [-5%-------------------] Carpc build #2. So far, 20$ deep! I love recycling!

    "The car is the closest we will ever come to creating something that is truly alive" -Sir William Lyons
    My worklog

  6. #6
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    i tried to calculate the watts on those calculators, and got 184 watts. for a power supply, theres only a few that can handle that kinda load. and they are expensive. or I can go on ebay and get a 400 watt inverter for like 40 bucks. im leaning towards inverter cause the power supplies seem inimidating, plus I dont care if i dont have a startup and shutdown etc. heres a link to the carpc i bought. http://cgi.ebay.com/ebaymotors/ws/eB...m=320134258417

    so, right now I am leaning towards buying a 400 watt inverter off ebay. what are the drawbacks though? and 400 watts should be more than enough to power both the moniter and carpc, right?

  7. #7
    Neither darque nor pervert DarquePervert's Avatar
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    Your power calculator sucks, my friend. There is no way that system draws 184W.
    Here's a good read to help you along: FAQ: Will <insert PSU model> Power Supply work with my system?

    However, considering that the seller is throwing in a cigarette lighter adapter, why even bother with an inverter? YOU DON'T NEED IT!

    If you don't want to see this cord danlging out of your sig lighter, then wire it to your battery (with a fuse, of course!). Add a shutdown controller, and it will power on with your ignition.
    Have you looked in the FAQ yet?
    How about the Wiki?



    Under normal circumstances, a signature would go here.

  8. #8
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    Quote Originally Posted by DarquePervert View Post
    Your power calculator sucks, my friend. There is no way that system draws 184W.
    Here's a good read to help you along: FAQ: Will <insert PSU model> Power Supply work with my system?

    However, considering that the seller is throwing in a cigarette lighter adapter, why even bother with an inverter? YOU DON'T NEED IT!

    If you don't want to see this cord danlging out of your sig lighter, then wire it to your battery (with a fuse, of course!). Add a shutdown controller, and it will power on with your ignition.
    Okay, I tried a different calculator, and i got 104 watts for my power consumption. not sure what the lilliput will need, but it still puts me pretty high for some reason. yes, it came with a cig plugin, but with the screen being fabricated, i will have lost the cig lighter adapter. screen will cover it. so I need to hardwire. i have looked up, and searched for a while, and its still kinda confusing. I figure the 400 watt inverter will be easiest. wire that up, and just plug in both the screen and computer, and im all set

  9. #9
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    Why did you pose the question if you weren't open to sugestions? Personally, I know jack about what will run everything, but I know these guys offer solid advice you may want to follow.

  10. #10
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    where in there did I not follow advice? I looked at all they showed me. I researched. not once has anyone mentioned what would best power my setup. so I am sticking with what's easiest for me. the inverter. case closed. please think before u post. thank u

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