ARCO Marine Zeus A275L J-180 4" Alternator w/Regulator

Zeus A275L J-180 4" Alternator with Regulator is the ultimate power solution for your marine vessel, delivering unparalleled energy output and reliability. Designed specifically for the demanding conditions of marine and boating environments, this high-performance alternator ensures your boat’s electrical systems run smoothly, even under heavy loads.

Key Features

• Highest Power Output: Engineered to deliver the maximum power within its size and class, ideal for marine applications.
• Versatile Applications: Perfect for Marine, RV, Military, and Commercial use, providing reliable performance across various settings.
• Rapid Charging: Efficiently charges large battery banks, ensuring your systems have the power they need when you need it.
• Enhanced Cooling: Operates 8-20% cooler than standard alternators thanks to heat-shedding coatings, an external refrigerator, dual cooling fans, and OEM components, resulting in increased performance and longevity.
• Optimized for Idle Performance: Maintains high performance even at idle engine speeds, reducing the dependency on generators.
• Advanced Coating Technology: Features E-Coat/Cerakote advanced coatings that absorb less heat, keeping the alternator cooler for sustained amperage.
• Smart Charging Options: Compatible with ARCO Zeus Bluetooth alternator regulators and lithium battery charging systems for enhanced performance.
• Certified Quality: SAE J1171 Certified, ensuring compliance with industry standards.
• Made in the USA: Proudly manufactured in the United States, guaranteeing quality and reliability.

Technical Specifications

Specification	Details
Voltage	12V
Field Type	P
Rotor Poles	16
Stator Size	138mm
Frame Size	Large
Weight	14.9 lbs / 6.7 kg
Regulation	Internal/External (Internally regulated with adaptor for optional external regulation)
Output Voltage	14.1V (Default)
Finish	Black Cerakote or E-coating
Cut-In RPM	1,061 Alternator RPM
Maximum Alt RPM	19,000
Battery Post	M8 Thread Post, Side Mount
Standard Pulley	49K6 (6-groove, 49mm)
Pulley Mount	17mm diameter shaft, 25mm long, threaded M17 x 1.5
Pulley Hardware	M17 x 1.5 x 24mm nut, with 18mm ID x 29mm OD washer (Included)
Diodes	6 positive, 6 negative, 50A Rated, Avalanche
Max Output (Cold, 9,000 RPM)	311 Amps
Sustained Cruising Output (Hot, 6,000 RPM)	227 Amps
Sustained Idle Output (Hot, 3,000 RPM)	198 Amps
Max Continuous Operating Temperature	110°C / 230°F

Mounting and Compatibility

The Zeus A275L J-180 alternator is designed to seamlessly replace most Volvo Penta alternators, utilizing a robust 4” J180 saddle-style mount. This ensures easy installation and compatibility with a wide range of marine engines.

Additional Resources

Download the Quick Guide (PDF)

Orders of physical products placed by 3 PM EST M-F typically ships the same day, if all requested items are in stock. Weekend orders will typically ship on Monday.

Shipping takes 2-7 days.

We currently ship to the Contiguous 48 States.

Life of Sailing merch is custom made for the customer after an order is placed. Total turnaround is typically 7-14 days from order to doorstep.