Everyone has probably thought of this already but one thing that I think is really cool about electric propulsion is that as energy storage technology (our Achilles Heel) improves, our boats will be ready to swap out the old batteries for the next better thing. I know we're all on the edge of our seats, waiting for the next better battery, right? Our electric motors work with lead- acid and lithium ion batteries of course, but they would also work with any future wonder that may develop- be that fuel cells, hydrogen, ultracapacitors, cold fusion, or...?
What does everyone think of ZEBRA batteries? For those that haven't heard of them, they are thermal sodium batteries that use molten salt as an electrolyte, and proponents claim that they have 4x as much capacity and are lighter/ smaller than the alternatives. They use salt and so are better for the environment and potentially cheaper. They are also currently being used in EVs (Think City and Modec), by the British Royal Navy on submarines and are now even being used on a sailing yacht in Europe, apparantly with great success.
Here's a short summary, with links and references about ZEBRA batteries and Innovanautic's use of them on their boat in Europe:
http://www.electricseas.org/profiles/blogs/innovanautic-inspires-europe
What do you think?
-Greg
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