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  1. #1
    Photographic enthusiast Misty's Avatar
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    Default Modified Sine inverter and laptop

    Greetings
    Shortly we are going away in our motorhome. Though we have not had long when going away we have used our laptop (small screen) on our modified sine wave (not pure sine) inverter. This has worked fine.

    However, we have now bought a laptop with a bigger screen and a bit apprehensive about using fully (ie with screen on).

    Our modified sine inverter is a Power Master and must be at least 1200 Watts (it is not one of the old modified ones).

    Not sure how to compare the laptops, if that is of importance. Though can get really good profiles, and have, from Belarc Advisor.

    The "old laptop" is hyper-threaded. The new laptop is a 2 gigahertz AMD chip with 8 RAM, but not hyper threaded, but has 4 core. Getting out of my depth here !

    Should I feel safe ? (1) for just charging (2) for using ?
    Cheers
    Jim
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  2. #2
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    Default Re: Modified Sine inverter and laptop

    Jim

    As per the NZM&C forum

    1 - Yes
    2 - Yes

    A dedicated DC-DC converter is still the better option.
    Is the inverter input 12 or 24V ?

  3. #3
    Old dick-head
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    Default Re: Modified Sine inverter and laptop

    Most new laptops (actually - probably all) use a switched mode power supply which immediately rectifies the incoming power to DC.

    Therefore the wave shape of your inverter is irrelevant.

  4. #4
    Photographic enthusiast Misty's Avatar
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    Default Re: Modified Sine inverter and laptop

    Hi Scubadoo - in this other realm !

    How can I find out whether input is 12 or 24V. The truck is 24V but that does not mean that the input is 24V necessarily, as I understand it ?
    Cheers
    Jim
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  5. #5
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    Default Re: Modified Sine inverter and laptop

    How is the TV, lighting, fridge etc. powered?
    i.e. From a 12V separate system or via a 24V to 12V high current converter?

    I guess it is not too important as you can simply use the inverter without any issues. Just do it.
    A DC-DC converter would simply save some power consumption.

    Remember to turn off the inverter if nothing else is in use.

  6. #6
    Photographic enthusiast Misty's Avatar
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    Default Re: Modified Sine inverter and laptop

    Hi Scubadoo
    The TV, lighting, (& fridge, when not on mains power, or gas) are powered by separate 12V system.
    Will do as you suggest and use the inverter.
    Many thanks
    Jim
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  7. #7
    Computer "Specialist" Agent_24's Avatar
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    Default Re: Modified Sine inverter and laptop

    Actually, your new laptop probably uses less power than the old one.
    Non-system disk or disk error. Replace and strike any key when ready.

  8. #8
    Photographic enthusiast Misty's Avatar
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    Default Re: Modified Sine inverter and laptop

    Hi Agent_24
    I presume that is because it is newer technology, and not because of lower specs ? Nevertheless it responds quicker, which is the name of the game
    Much appreciate your comment
    Jim
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  9. #9
    6146-B Billy T's Avatar
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    Default Re: Modified Sine inverter and laptop

    I recommend that you monitor the temperature of your inverter the first time you use it to recharge your computer. I used one in my car to recharge a small notebook and it overheated like mad in a very short time. No harm was done to either device, but I was rather surprised to say the least!

    Cheers

    Billy 8-{)
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  10. #10
    Computer "Specialist" Agent_24's Avatar
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    Default Re: Modified Sine inverter and laptop

    Quote Originally Posted by Misty View Post
    Hi Agent_24
    I presume that is because it is newer technology, and not because of lower specs ? Nevertheless it responds quicker, which is the name of the game
    Much appreciate your comment
    Jim
    Yeah, it will likely have a lower power use due to newer and more efficient technology - of course depending on the exact hardware this may be untrue but in general I would expect it to be. (Compared to the old one)

    Quote Originally Posted by Billy T View Post
    I recommend that you monitor the temperature of your inverter the first time you use it to recharge your computer. I used one in my car to recharge a small notebook and it overheated like mad in a very short time. No harm was done to either device, but I was rather surprised to say the least!

    Cheers

    Billy 8-{)
    I wonder what would cause that? Laptop power adapters seldom go above 100 Watts AFAIK. Perhaps there was some kind of instability between the inverter circuitry and the PSU?
    Non-system disk or disk error. Replace and strike any key when ready.

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