Proper inverter for my laptop?

I am trying to power my Lenovo G510 while at work in a vehicle, and I'm having a devil of a time finding the proper inverter to do this. I have already ordered and tried 4 different inverters from Amazon, and not one works. I have tried anywhere from a 200W up to 500W inverters. My laptop is 65W, and the AC adapter says:
INPUT: 100-240v,1.8a, 50-60Hz
OUTPUT: 20v, 3.25a.

Please help.

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Re: inverter

A link to the inverters you ordered might help to understand the problem.
Doesn't your laptop have a battery? That's the common way to work with it in a car, plane or public transport.


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links to inverters
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After 4 I think this is pointing to the vehicle.

Unless there is some untold story, the usual is the vehicle is now suspect. Getting 4 non-working inverters (12V to 110) is quite the run of bad luck. Does the lighter socket work at all?

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The lighter port most definitely DOES work, as I've tried it with other devices. The inverters themselves also work with other devices, meaning I've tried the 110v plugs with other things as well as used the USB ports with other devices, and they are all powering up. Someone on Amazon had mentioned that these inverters may not recognize the "electrical waveform" of my laptop, but that it way too technical a term for me to understand with my minimal knowledge of electricity. That being said, I would think that any inverter over 65W should be able to handle a 65W laptop, but I'm obviously wrong.

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Yes it can get technical.

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