This DC generator works well for all types of projects. It's popular for charging batteries and learning about clean energy. This generator is capable of producing high output when used with the 15″ Replacement Prop for the Small Wind Turbine Generator. While testing in high winds, measurements of 100 volts and 1.8 amps were recorded. Generator type: Brushed 30 volt DC motor. Battery charging: 12 volt DC. Charging rpm: 500 to 2000 rpm. Output: 15 watts. Shaft diameter: 1/8″ Shaft length: 7/16″.