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I was going to make the same suggestions as Sailingdog. I am new to big sailboats, but offshore electronics are not new to me. If you are using the standard AC to computer adaptor, you are wasting a whole lot of energy right there. Taking alternator dc to battery to inverter to AC to converter to end up with dc....well, its not very efficient. I have found little dc-to-dc converters at Best Buy in the US that are to run your laptop off your vehicle via the cigarette lighter style jack. Just cut the cigarette lighter end off and wire that to convenient dc on the boat.
Second, as suggested, go into your laptop' power saving menus. Easiest is to set up hibernate or standby mode after a few minutes inactivity. The LCD is a big source of power usage, and the fans. If you set it up to turn itself down after a few minutes of inactivity (that you set to personal preference), it will boot right back up with a single keystroke, usually an "enter" key, or a mouse click.
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