Zeus A225S 3.15 Alternator with Isolated Ground & Terminal BlockThe highest power output alternator in its size\/class. Features:Engineered for high energy production.Suitable for marine, RV, military, and commercial applications.Rapidly charges large battery banks.Coolest operating temperatures for increased performance, running 8-20% cooler than incumbent alternators due to:Heat shedding coatingsRectifier located on housing exteriorDual cooling fansOEM componentsOptimized for performance at idle speeds.Reduces the need for a generator by creating additional power with your engine.Unleash peak performance with E-Coat\/Cerakote. Our advanced coating absorbs less heat, keeping the A225S cooler for sustained amperage output.Use the ARCO Zeus Bluetooth Alternator Regulator for maximum performance or lithium battery charging.SAE J1171 Certified.Models are available with an internal\/external voltage regulator.Proudly made in the U.S.A.Technical Specifications:Voltage – 12vField Type – PRotor Poles – 16Stator Size – 130mmFrame Size – SmallWeight – 12 lbs\/5.4 kgRegulation – Internal\/External (Internally regulated with adaptor for optional external regulation.)Output Voltage – 14.1v (Default)Finish – (Black) Cerakote or E-coatingCut-In RPM – 1,061 Alternator RPMMaximum Alt RPM – 19,000Battery Post – M8 Thread Post, Side MountStandard Pulley – 49K6 (6-groove, 49mm)Pulley Mount – 17mm diameter shaft, 25mm long, threaded M17 x 1.5Pulley Hardware – M17 x 1.5 x 24mm nut, w\/ 18mm ID x 29mm OD washer (Included)Diodes – 6 positive, 6 negative, 50A Rated, AvalancheMax Output (Cold, 9,000 RPM) – 254 AmpsSustained Cruising Output (Hot, 6,000 RPM) – 187 AmpsSustained Idle Output (Hot, 3,000 RPM) – 157 AmpsMax Continuous Operating Temperature – 110°C \/ 230°FMounting Application:Replaces most small case styles using a 3.15" saddle style mount (e.g., Hitachi, Lucas, Mitsubishi). Most Yanmars. Requires Standard single "V" belt upgrading to a Serpentine System