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There are inexpensive (<$20usd) DC/DC converters available to power laptops and other equipment straight from ship's batteries that supply constant voltage from the varying source of the house banks.
The problem with the Macbook Pro is the specialized magnetic power adapter end (which is brilliant in itself, but not for this application). You would need to cut this end off of your power adapter (or get another one), determine which wires hook where and splice it onto the DC/DC converter output. Not difficult, but not pretty.
Mark
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