ARCO Marine Zeus A275L 1"-2" Single Foot Alternator w/Regulator

The Zeus A275L 1"-2" Single Foot Alternator with Regulator is the ultimate power solution for marine and boating applications. Engineered to deliver the highest power output in its class, the A275L ensures reliable and efficient energy production to keep your vessel's electrical systems running smoothly.

Features

• Engineered for high energy production, providing robust power for all your marine needs.
• Ideal for marine, RV, military, and commercial applications, offering versatile performance.
• Rapidly charges large battery banks, ensuring your batteries are always ready.
• Operates at the coolest temperatures for enhanced performance and longevity.
• Runs 8-20% cooler than standard alternators thanks to heat-shedding coatings, an external rectifier, dual cooling fans, and OEM-grade components.
• Optimized for performance at idle speeds, perfect for marine engines that often operate at lower RPMs.
• Reduces the need for a generator by providing additional power directly from your engine.
• Enhanced with E-Coat/Cerakote advanced coatings that absorb less heat, allowing for higher amperage output over extended periods.
• Compatible with ARCO Zeus Bluetooth alternator regulators and lithium battery charging systems for maximum efficiency.
• SAE J1171 Certified, ensuring compliance with industry standards.
• Proudly made in the U.S.A., 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 Application

The Zeus A275L is designed to replace most domestic alternator styles using a single 1” or 2” mounting foot, including popular brands like Motorola and Prestolite. This ensures easy installation and compatibility with a wide range of marine engines.

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.