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What you need to do is not use the power supply for the note book.
This is very inefficient, and so you need a 12V to 18V inverter. You can make these or buy them. I made one for my old LX200, and worked fine. Only a few components, and a small veroboard, or buy one from ebay or somewhere.
Make sure it can supply at least 4 amps.
That should keep your laptop going much better than a AC inverter and switchmode laptop supply.
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