I'm currently building a small solar powered robot boat. I expect it to work fine (because why not.. :-) ), but I'm already looking for other ways than only solar panels to generate electrical power. Since the sea has waves that will move my boat a lot I was thinking of the possibility to harness this power to generate some more energy. So isn't it possible to create a bigger and heavier version of the things they have in certain watches:
What if I made one which weights a kilo or so. I understand it won't give an enormous amount of energy, but it will be moved 24/7 and every extra watt is welcome to power the motors.
Are there any reasons why this currently isn't used (as far as I know)?