Results 1 to 7 of 7

Thread: Laptop power questions

  1. #1
    Newbie
    Join Date
    Aug 2008
    Posts
    13

    Laptop power questions

    1. Let say, I have install a 300w inverter directly to my battery (with relay), and plug in a laptop AC adapter (70w), will it damage my power supply/laptop?

    2. Is it recommended to connect a powerboard to the inverter to power other electrical goods such as, powered usb hub, monitor etc?

    The inverter: http://jaycar.com.au/productView.asp...T&SUBCATID=680

    I appreciate the help!

  2. #2
    Admin. Linux loser.
    Auto Apps:loading...
    Bugbyte's Avatar
    Join Date
    Sep 2004
    Location
    Corning, NY
    Posts
    7,359
    Blog Entries
    2
    No. Using an inverter that is 300 watts to power something that needs only 70 watts will not hurt the 70 watt device. The inverter will only supply what is needed by the devices plugged in. It will not "push" 300 watts through it.

    I don't know what you mean by 'powerboard'. Do you mean a power strip?
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

  3. #3
    Newbie
    Join Date
    Aug 2008
    Posts
    13
    Awesome, thanks for that!

    And yes, power strip would I be able to use one - is it recommended?

    Thanks for you help!

  4. #4
    Variable Bitrate
    Join Date
    Nov 2007
    Posts
    262
    I'm using an inverter for my laptop CarPC, I think it's only 100 watts but that's plenty. I am using two passive (powered by the laptop) USB hubs, so the laptop's power supply just plugs directly into the inverter.

    I am looking for a way to use a powered USB hub, but I'd rather do that without running more 120v wiring through my car. You could use a power strip but it seems like a waste of space, and a waste of power. On the other hand I am still looking for 12v power for a bigger USB hub so I haven't got a much better idea...

    My touchscreen uses 12v power, so it's powered from (what used to be) the cigarette lighter circuit.

  5. #5
    Newbie merlin12volt's Avatar
    Join Date
    Mar 2009
    Location
    Pittsburgh PA
    Posts
    20

    someone correct me if I am wrong

    Since your powered hub does nothing more then supply 5vdc to one pin and ground to the other, it would stand to reason that you could get one of these http://www.dealextreme.com/details.dx/sku.688 a usb to usb cable and a 12volt cigarette adapter to hardwire since I know you said that the screen uses the cigarette lighter.

    There is another way to go about this by building a simple voltage regulator circuit, but odds are, if you are asking this question, you probably either know nothing about that or aren't interested.

    Either way hope this helps.

  6. #6
    Variable Bitrate
    Join Date
    Nov 2007
    Posts
    262
    Actually I bought something very similar, cracked it open to get rid of the cigarette lighter plug, soldered in some wires, spliced those into my cigarette lighter circuit... and had no luck. The USB hub just stopped working when I connected my hacked power supply.

    I probably screwed something up. But at that point I wanted my car back (was working on another under-dash project at the same time) so I just went back to my passive 4-port hub rather than trying to diagnose what went wrong with my hacked power supply.

    Someone here was working on a purpose-built USB power supply but I lost track of that thread. Time to search...

  7. #7
    Variable Bitrate
    Join Date
    Nov 2007
    Posts
    262
    Found two, but neither is what I was looking for...

    http://store.mp3car.com/Automotive_P..._p/pwr-022.htm
    http://store.mp3car.com/Carnetix_CNX..._p/pwr-016.htm

    I am pretty sure there's a third one...

Similar Threads

  1. HOW TO:use opus with a laptop......
    By turbocad6 in forum Power Supplies
    Replies: 24
    Last Post: 06-25-2009, 06:31 AM
  2. 2007 Ford Fusion Carputer (version 2.0)
    By FusionFanatic in forum Show off your project
    Replies: 43
    Last Post: 04-20-2009, 04:56 PM
  3. Auto Power on/off using laptop
    By stevey500 in forum General Hardware Discussion
    Replies: 6
    Last Post: 12-11-2008, 01:30 PM
  4. USB power up and power down questions!
    By HiJackZX1 in forum General Hardware Discussion
    Replies: 1
    Last Post: 03-03-2008, 10:31 PM
  5. Cigarette Socket Power Questions
    By jfeinman in forum Newbie
    Replies: 8
    Last Post: 02-26-2008, 07:40 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •