Zeus A275L J180 4" 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.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, keeping the A275L cooler for sustained amperage output.Use the ARCO Zeus Bluetooth Alternator Regulator for maximum performance or lithium battery charging.SAE J1171 Certified.Models available with internal\/external voltage regulator.Proudly made in the U.S.A.Technical Specifications:Voltage – 12vField Type – PRotor Poles – 16Stator Size – 138mmFrame Size – LargeWeight – 14.9 lbs\/6.7 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) – 311 AmpsSustained Cruising Output (Hot, 6,000 RPM) – 227 AmpsSustained Idle Output (Hot, 3,000 RPM) – 198 AmpsMax Continuous Operating Temperature – 110°C \/ 230°FMounting Applications:Replaces most Volvo Penta alternators using a 4” J180 saddle-style mount