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Thread: Battery loss through inverter

  1. 12th May 2015, 05:18 AM #11
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    Quote Originally Posted by PAUL200 View Post
    Well anyway...I think i have found a way around this problem.....

    I can use a small LCD monitor which is USB powered (5 volts I believe) and wire this straight to the battery (via a cheap 12 volt cigarette USB charger).

    Then comes the computer....it requires 19 volts and consumes 3.42A (according to power supply). How can I change 12v Dc to 19v DC....can't seem to find a step up/down transformer that is suitable for this........any ideas?

    Ahhhh!
    Yep, you can buy 12 volt power supplies for a laptop - I have one myself in my work car and it negates the need for an inverter now.

    Try something like this - Search Results : Cheap Laptop Battery, Australia and New Zealand.
    If you need to contact me please email homestarrunnerau@gmail.com - thanks - Gav.
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  2. 12th May 2015, 07:08 AM #12
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    Quote Originally Posted by PAUL200 View Post
    Then comes the computer....it requires 19 volts and consumes 3.42A (according to power supply).
    Then at 12volts DC that should be around 5.4A which with 105AH battery should last a while. This sounds more reasonable.
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  3. 12th May 2015, 07:23 AM #13
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    Something like this, complete with USB port:



    Huntkey X MAN 90W Universal Notebook CAR Charger With USB Port 8 Tips | eBay
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  4. 12th May 2015, 08:52 AM #14
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    Quote Originally Posted by bee utey View Post
    Something like this, complete with USB port:



    Huntkey X MAN 90W Universal Notebook CAR Charger With USB Port 8 Tips | eBay
    Ooh, I like that one...

    Work is about to buy me one I think, much smaller than my setup and will charge other things at the same time.

    Thanks.
    If you need to contact me please email homestarrunnerau@gmail.com - thanks - Gav.
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  5. 12th May 2015, 08:58 AM #15
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    buy a suitable external hard(as to hold all the data from your computer) or even stick cos there are quite cheap 128Gb on the market, save in it everything from your desktop, give away the desktop for charity, get a cheap second hand good laptop and load it with the data or run it with the external hard/stick on 12V supply and you can be powered for many, many hours
    Discovery Td5 (2000), manual, tuned
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  6. 12th May 2015, 05:02 PM #16
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    PAUL200
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    I found the solution today:

    I bought a in car laptop charger from Jaycar:

    150W Car Laptop Power Supply | Power Products | Connectivity | IT Products | PRODUCTS | MP3472 | Jaycar Electronics

    This then allows me to run a 19V 3.42A computer system off my secondary battery!

    Wahoooo! I just tested it and it works! Now I just need to hard wire the thing up!
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