At what rpm does a Jacobs 2,500 watt generator put out it's rated output? It will be pulley driven at ground level by a large water pumping windmill that has been converted from a reciprocal power shaft to a rotary. Although the 14' diameter windmill has a rather slow rpm, it has a lot of torque that will allow the speed to be increased to pretty much whatever is needed using pulleys.
This will be used along with a solar system to charge a battery bank. The windmill has 24 blades on the wheel and will operate in a low wind.