Install cigarette lighter sockets around the yacht, attached to the 12v house
power lines. A
charger with this kind of
plug can be found for any device. Then use standard
solar panels to top up your house
batteries.
With this kind of
hardware buying by brand name doesn't make much sense any more, it's a mature technology. Look for the smallest unit that delivers enough
power for the application. I own a
laptop that chews 25W when running, with 200W of
panels I never have to worry about power. Then again, this is
Queensland and you may not get as much sunshine.