The reason I said wind turbine is they can produce electricity with less drag so they are more efficient. My rebel 800 will start to turn in a 3 mph wind and charge my battery bank in a 5 mph wind. versus an alternator that needs to spin at a higher rpm to produce juice and needs a battery to start a trickle charge. without a trickle charge the alternator is no good a wind turbine requires no live battery trickle charge. It will charge from a completely dead battery. most batteries are considered dead at 10.5 Volts wind turbines will charge a battery from 1 volt. already done it. I just don't have the stream and wind is unreliable. the only alternative I have is Purchase a grid tie inverter ( a special type of inverter ) and plug it into my wall and run my electric meter backwards and build up credits from the electric company so more lights can be used.
Just some food for thought.