-- Last Updated: Dec-23-12 8:50 PM EST --
...... to turn a small generator using the canoe/kayak's paddle speed . A small generator's shaft (being extended) could be rigged on a couple stand-offs allowing a vertical position . Each stand-off could carry a sealed ball bearing at it's extent and the shaft run through them .
The small generator would set above deck heigth , and the paddle wheel on the other end of the shaft would be submerged .
This same generator with extended shaft running through bearings could also possibly be placed in a shallow current with a tripod near camp shoreline .
The rigging setup seems pretty simple and uncomplicated , compact and lightweight .
Anyway , the idea is to let the paddled canoe/kayak do the work of turning the small generator . And when at camp if a river current is available , let that turn the generator .
I pretty sure (very) small generators that are capable of charging a 12v device are available .
I'm not certain how much turning force is required to spin one of these small generators , but it can't be much . I would think a small paddle wheel should easily be able to do the job . Some are turned by a small set of propeller blades in the wind .
If you got hours and hours of this type charging going on while you don't even have to think about it , other than changing the different 12v devices you have with you to the generator's leads ... well , there ya go .
How about one of these (maybe the YAF-300 , 450 rpm) : http://www.small-generator.com/index.htm
You see ever that kid pedaling a stationary bike in the TV room so he can watch TV ... the bike powers the TV .