High RPM Permanent Magnet DC Generator - Magnets: Two high-energy saturated C8 ceramic magnets. - Shaft: Stainless steel 12.7mm (1/2") diameter, 40mm length, with 1mm full-length flat. - Armature: 16-slot armature 52mm diameter would with AWG25 magnet wire (fusing current:24 amps). - Brushes: Extra-long 8x14mm brush assemblies including spring, pigtail, and cap - replacement stock no. 443729 - Bearings: Two double-sealed 32mm OD ball bearings - replacement stock no. 171110 - Rotation: Either direction - The red or white output wire is positive for clockwise rotation from the shaft end. - Speed: Zero to 5,000 rpm - generates at all speeds. - Mounting: Four 1/4-20 holes on the front or rear end caps, or by hose clamps on the magnet drum. - Weight: 4.2Kg (9.2lb) Shipping weight 4.6Kg (10lb), dimensions 150x150x300mm (6x6x12in). - Resistance: Internal resistance 0.3 ohms. Inductance 22mH. - Performance: REACHES 12V @ 2250 RPM. - Maximum charging current for this generator is 20A. If you exceed this specification, the generator will overheat and short. See run times below.