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Thread: what exactly do i need to use? (powering laptop)

  1. #1
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    what exactly do i need to use? (powering laptop)

    i've read about the opus and the ITPS, but i will leave it to the experts...

    i have a compaq laptop that takes 12V DC. i want to power the laptop thru the battery while the car is running, then switch to battery when the car shuts off. (i guess that would happen anyway...)

    which device do i need, the opus or the ITPS? how do you wire it once you get it? is it easy to do?

    thanks!

  2. #2
    Maximum Bitrate d_sellers1's Avatar
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    Here's my thoughts. I would go with just a regular DC-AC invertor. You can get a cheap one that doesn't have a lot of wattage. Hook this up to the ignition.
    -When the car is on, power will be supplied through invertor to the laptop thereby giving it AC power.
    -When the car is off, there will be no power through the invertor so the laptop will run on its on battery power. If you're running Windows, you can set the power management settings to put the computer into standby or hibernate once the battery gets to 50% for exampe (depending on how quickly your internal battery goes).

    The Opus and ITPS are more for desktop type systems. I don't think they will be needed for a laptop since you already have a battery with internal power management capabilities.

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  3. #3
    Variable Bitrate no1knows's Avatar
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    Yeh, u'll need a relay to trigger the inverter, dont want it running straight of ACC line really. Not sur ehow your going to turn it on at the start, you may need to solder in wires for a switch so u can have an on switch in the front.
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  4. #4
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    Quote Originally Posted by no1knows
    Yeh, u'll need a relay to trigger the inverter, dont want it running straight of ACC line really. Not sur ehow your going to turn it on at the start, you may need to solder in wires for a switch so u can have an on switch in the front.

    i never even thought about how i would turn it on! i will have to think about that one! is there a way that i could use the Opus to get the 'turn-on' functionality? i have no idea how that would work. would i have to make/buy wires or cables so i could power the laptop from the Opus?

    and if i went with the inverter instead, what type of relay do you mean? do you have a link maybe?

    thanks!

  5. #5
    Variable Bitrate no1knows's Avatar
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    The opus has two wires which work with conventional motherboards as the power switch, as the power switch is hard wired in most laptops this isnt really an option without getting the soldering iron out and soldering your own connections on.

    An inverter will allow you to plug your normal mains laptop power lump into the car. To be honest you'll be better off getting a DC-DC laptop adapter and output 12v, more efficient, smaller and no chance of inverter noise.

    You will need a relay in both cases to control whether or not your main battery is poewring the laptop, you would wire your ACC wire from stereo wiring loom or cig lighter positive to one side of the coil, ground the other side. This will mean the relay will switch only when the key is turned in the ignition (except for during cranking).

    You just want a normal 30A 12v automotive relay.
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