This listingincludes: 10 units of wind charge controller, 300w 12v Features: Rate Battery voltage: 12V Rate power: 300w Brake voltage: 15V Recovery charging voltage: 13.5V Be able to 100w,200w, 300w wind-turbine, 12V Mini size, be easy to be install Installation: AC in: connect the wind turbine to three green cables DC out: connect the black cable to the negative pole of battery; connect the red cableto the positive pole of battery,