On JAC 08 I had three sources of electrikery:
Wind generator. Aerogen - good!
Solar panel: 35W portable. When I was testing this I had it putting 2amps into a battery. I covered one cell to see what the effect would be and the charge dropped to 0.5amps. So just a rope shadow across the panel is going to really harm output. I moved it around the boat to keep it out of shadow and perpendicular to the sun - great bit of kit.
Water generator: Brilliant power output (you could weld with it) but quite a bit of drag. I only used it on long downwind runs when the sky was overcast - rendering both the solar and wind systems useless. It also helped to keep the speed under control when the surfing got a bit too exciting!
As Stingray is a multihull (confuses wind vanes) I used a Simrad TP10 tillerpilot. It worked pretty hard.
Like Duncan I used a head torch with a red and white LED to protect night vision.
If, and i mean if, I do JAC 12, I will stick with the same kit but with the addtion of a servo blade driven by the tiller pilot. This should significantly reduce consmption. I've got the servo blade (thanks Stan!) Hopefully I will get time to fit it this winter for testing in '11.
Rules are for the guidance of wise men, and the obedience of fools.