ARCO Marine Zeus A275L J180 4-Inch Alternator with Isolated Ground and Regulator

Zeus A275L J180 4 Alternator with Isolated Ground Regulator

The highest power output alternator in its size/class.

Features:

• Engineered for high energy production.


• Suitable for marine, RV, military, and commercial applications.


• Rapidly charges large battery banks.


• Coolest operating temperatures for increased performance.


• Heat shedding coatings


• Rectifier located on housing exterior


• Dual cooling fans


• OEM components


• Optimized for performance at idle speeds.


• Reduces the need for a generator by creating additional power with your engine.


• Unleash peak performance with E-Coat/Cerakote, keeping the A275L cooler for sustained amperage output.


• Use the ARCO Zeus Bluetooth Alternator Regulator for maximum performance or lithium battery charging.


• SAE J1171 Certified.


• Models are available with an internal/external voltage regulator.


• Proudly made in the U.S.A.

Technical Specifications:

• 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, w/ 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 - 110C / 230F

Mounting Application:

• Replaces most Volvo Penta alternators using a 4 J180 saddle-style mount

The ARCO Marine Zeus A275L J180 4-inch alternator is engineered for high energy output in demanding marine, RV, military, and commercial applications. This alternator is designed to rapidly charge large battery banks while maintaining cool operating temperatures, thanks to advanced heat shedding coatings and dual cooling fans. Its robust construction and high-performance components ensure reliable power delivery and longevity even in harsh environments. The black Cerakote or E-coating finish enhances durability and corrosion resistance, making it suitable for marine use.

Features include an internal or external voltage regulation option, with compatibility for the ARCO Zeus Bluetooth regulator for optimized performance and lithium battery charging. The alternator's design incorporates OEM components, a rectifier located on the exterior housing for efficient heat dissipation, and an M8 threaded side mount battery post for versatile installation. Its high maximum output of over 300 amps at cold start and sustained outputs exceeding 200 amps at normal operating RPMs make it ideal for high-demand systems. The alternator is also optimized for performance at idle speeds, reducing engine load while delivering consistent power.

Built with safety and efficiency in mind, the ARCO Zeus A275L features avalanche-rated diodes for reliable operation, and its design includes a 16-pole rotor and a 138mm stator for high efficiency. Its 14.9-pound weight and large frame size make it suitable for a variety of mounting configurations. Certified SAE J1171 and made proudly in the USA, this alternator is a top choice for demanding power needs. Whether replacing most Volvo Penta models or upgrading your existing setup, this alternator provides peak performance, durability, and ease of installation with a 6-groove pulley and threaded shaft.

Ideal for applications requiring high amperage output and reliable operation, the ARCO Marine Zeus A275L J180 4-inch alternator is a premium choice for professional and enthusiast users seeking maximum power and longevity in their systems.

Features:

• Engineered for high energy production and rapid charging capabilities

• Suitable for marine, RV, military, and commercial applications

• Rapidly charges large battery banks with high sustained amperage

• Operates at cooler temperatures due to heat shedding coatings and dual cooling fans

• Rectifier located on exterior housing for efficient heat dissipation

• Dual cooling fans enhance cooling efficiency and performance

• Built with OEM components for durability and reliability

• Optimized for performance at idle speeds, reducing engine load

• Creates additional power to reduce generator dependency

• Unleashes peak performance with E-Coat/Cerakote for cooler operation

• Compatible with ARCO Zeus Bluetooth Alternator Regulator for maximum performance

• SAE J1171 certified for quality and safety

• Available with internal or external voltage regulation options

• Made in the USA for quality assurance