Arco Starting & Charging A225S-12-VT-IE-49K6 Zeus High Output Alternator

The ARCO Zeus A225S is a high-output 12V marine alternator engineered to deliver exceptional charging performance in its size class. This Vortec-mounted model features internal/external regulation capability, making it ideal for marine engines with GM-style pad mounting systems including many Mercruiser and Volvo Penta applications.

Advanced Performance Features:

• 12V output with 254 amp maximum output (cold, 9,000 RPM) and 187 amp sustained cruising output (hot, 6,000 RPM)
• Runs 8-20% cooler than competitive alternators through E-Coat/Cerakote finish that absorbs less heat
• Dual cooling fans and external rectifier placement for superior heat dissipation
• Optimized for performance at idle speeds, reducing need for generator operation
• 16-pole rotor with 130mm stator and 6 positive/6 negative 50A rated avalanche diodes
• Compatible with lithium battery charging when paired with ARCO Zeus Bluetooth regulator

Technical Specifications:

• Voltage: 12V with 14.1V default output
• Regulation: Internal/External (IE) - internally regulated with adapter for optional external regulation
• Mounting: Vortec/GM pad mounting feet (replaces Mando-type alternators)
• Pulley: 49K6 (6-groove, 49mm) with 17mm diameter shaft, M17 x 1.5 threaded
• Weight: 12 lbs
• Cut-in RPM: 1,061 alternator RPM
• Maximum alternator RPM: 19,000
• SAE J1171 Certified
• Made in USA

Rapidly charges large battery banks and provides sustained high-amperage output for demanding marine, RV, military, and commercial electrical systems. The A225S is designed to handle the rigorous demands of continuous operation while maintaining cooler operating temperatures for consistent performance.