Arco Starting & Charging 4018 Zeus A225S High Output Marine Alternator 12V 225A

The Arco Zeus A225S Vortec alternator delivers the highest power output in its size class, engineered specifically for demanding marine, RV, military, and commercial applications. This premium 12-volt alternator is designed to rapidly charge large battery banks while maintaining the coolest operating temperatures in its category.

Key Features:

• Maximum output of 254 amps cold at 9,000 RPM; 187 amps sustained cruising output at 6,000 RPM
• Runs 8-20% cooler than competing alternators through advanced heat-shedding Cerakote or E-coating finish
• Dual cooling fans and exterior-mounted rectifier for superior heat dissipation
• Optimized for strong performance at idle speeds with 157 amp output at 3,000 RPM
• Internal or external regulation capability; compatible with Arco Zeus Bluetooth regulators for lithium battery charging
• SAE J1171 certified and proudly made in the USA
• OEM-grade components with avalanche-rated diodes for reliable operation

Technical Specifications:

• Voltage: 12V with 14.1V output (default)
• Stator Size: 130mm with 16 rotor poles
• Weight: 12 lbs (5.4 kg)
• Cut-in RPM: 1,061 alternator RPM; Maximum RPM: 19,000
• Standard pulley: 6-groove, 49mm (49K6) on 17mm diameter shaft
• Battery connection: M8 threaded post, side mount
• Diodes: 6 positive, 6 negative, 50A rated avalanche type

Mounting Application:

• Direct replacement for Mando-type alternators using Vortec/GM pad mounting feet
• Compatible with Mercruiser and Volvo Penta 3.0GLM, 3.0GLP, 4.3GXi, 5.7GiL, 5.7GXiL marine engines on GM blocks

This high-output alternator reduces or eliminates the need for a separate generator by creating substantial additional power directly from your engine. The advanced thermal management system ensures sustained peak performance even under continuous high-load conditions.