I've looked at the portable wind jobs, but they become too big for the output required. might be looking at a 2mtr blade. Solar is the go at the moment.
forgotten their name but some panels produce awesome amounts of amps. there was a product called a "sun ball" on the New Inventers but not sure jf it took off'
Was the size of a volley ball, concerntrated the sun as well as followed the sun during the day for 100% efficiency. probably pricey.