Arco Starting & Charging A275L-12-DF315-IE-49K6 Zeus Marine Alternator 12V 275A J-180 Mount

The Arco Zeus A275L is a high-performance 12-volt marine alternator engineered to deliver exceptional power output in a compact 3.15" J-180 saddle mount design. This premium alternator is designed for marine, RV, military, and commercial applications where reliable high-amperage charging is essential for large battery banks and demanding electrical systems.

Advanced Thermal Management:

• Runs 8-20% cooler than conventional alternators through innovative engineering
• Heat-shedding Cerakote or E-coat finish absorbs less heat for sustained high output
• Externally mounted rectifier improves heat dissipation
• Dual cooling fans maintain optimal operating temperatures
• Maximum continuous operating temperature of 230°F (110°C)

Exceptional Power Output:

• 311 amps maximum output (cold, 9,000 RPM)
• 227 amps sustained cruising output (hot, 6,000 RPM)
• 198 amps sustained idle output (hot, 3,000 RPM)
• Optimized performance at idle speeds for superior low-RPM charging
• Rapidly charges large battery banks, reducing or eliminating need for generators

Technical Specifications:

• Voltage: 12V with 14.1V default output voltage
• Field Type: P-type with 16 rotor poles
• Stator Size: 138mm with large frame construction
• Regulation: Internal with adapter for optional external regulation
• Diodes: 6 positive, 6 negative, 50A rated avalanche type
• Cut-in RPM: 1,061 alternator RPM
• Maximum RPM: 19,000
• Weight: 14.9 lbs (6.7 kg)

Mounting and Connections:

• 3.15" J-180 saddle style mount (replaces Hitachi, Lucas, Mitsubishi styles)
• Compatible with most Yanmar engines
• 49K6 standard pulley (6-groove, 49mm diameter)
• 17mm diameter shaft, 25mm long, threaded M17 x 1.5
• M8 thread battery post with side mount configuration
• Mounting hardware and washer included

Quality and Certification:

• SAE J1171 certified for marine applications
• Made in the USA with OEM components
• Compatible with ARCO Zeus Bluetooth alternator regulator for maximum performance
• Suitable for lithium battery charging with proper external regulator

This alternator represents the highest power output available in its size class, making it ideal for vessels with extensive house loads, inverter systems, and large battery banks requiring rapid, efficient charging even at engine idle speeds.