How to use macbook air on 12v supply, how to use macbook air on 12v supply

I want to use my macbook air when in my rv which has 12v supply. I tried an inverter; this did not work. Has anyone any suggestions?
I am in UK

My error they changed the interface you just uncheck mirroring:
Make sure each display is properly connected and powered on.
From the Apple () menu, choose System Preferences.
From the View menu, choose Displays.
Click the Arrangement tab.
Disable (uncheck) "Mirror Displays".
Message was edited by: themachead

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