Don't worry, Cwatters/anorlunda, I have plenty of knowledge to solve the practical issues and I could use a 24V Minn Kota as a basis for charging, since it would only need half the rpms to reach adequate Voltage (14V)
As for the rpm drop of a dragged motor, that still concerns me. Is there...
Current max is 30amps, at 12V ->360W maximum power consumed by the motor at 1200rpm (rated under load.)
I haven't got a clue about the internal resistance of the motor though, which I assume is necessary to estimate the power generated by the motor/generator.
One other thing I am curious about...
Thanks Anorlunda.
Yes, I plan to use the motor dragging behind a (sail) boat, under water. The rpms stated are correct, the prop has a pitch of 4.5inch and speeds are between four and six nautical knots (2-3m/s). However... I think achieving enough power and voltage will be problematic since...
I am trying to figure out whether I can use a small Minn Kota trolling motor as an electric generator.
If I add a 10" prop the max energy from the water passing the prop should be about 700W and if the prop is 50% efficient, it should put half of that on the shaft. I expect the prop to turn...