[roflyear]

Not really. You won't run it all the time on a cruising yacht. Just when you need it. You probably don't care about having internet constantly under passage just for short times to get weather and to send out updates to friends and family.

[dzhiurgis]

At 50-100W you might not, that's close to what your fridge uses. Make it 10-20W and it becomes no brainer to keep always on.