Powering macbook air from 12v supply?

A friend wants to power her MacBook Air on her boat from a 12V source (DC) What should she do, to get the most power-efficient solution?

DOlec 
Embrace battery innovation and independent power generation
I know 2 people that charge their Air off a roll up solar cells with a cigarette female adapter (MOST solar cells come with them)
using that an a 12V cig. adapter
So, its very easy to do

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