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Wind generator and Solar panels seem to be the things of the day.

Years ago solo sailors doing circumnavigation were using water trolling
impellers to charge their batteries.

At the time, the water impeller generator appear to produce enough
electrical power to operate short wave radio. The main problem was that
fishes or sharks would get attracted by the underwater trolling device and
eat it or damage it. Any tough on a newer design that could supplement
solar panels?

I'm still waiting for the Nuclear Regulatory Commission to give me the
thumbs up on an RTG.
--
Mike Harris
Austin TX