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.