ARCO Marine Zeus A275L Vortec Alternator with Regulator - High Power Marine and RV Alternator

Zeus A275L Vortec Alternator with 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.


• Runs 8 - 20% cooler than incumbent alternators due to: Heat shedding coatings, Rectifier located on housing exterior, Dual cooling fans, and OEM Components.


• It is 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. Our advanced coating absorbs less heat, keeping the A275L cooler. This translates to more amperage for sustained periods.


• Use an ARCO Zeus Bluetooth alternator regulator or lithium battery charging for maximum performance.


• SAE J1171 Certified.


• 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 Mando-type alternators using Vortec/GM pad mounting feet. (Found on many Mercruiser and Volvo Penta 3.0GLM, 3.0GLP, 4.3GXi, 5.7GiL, 5.7GXiL Marine Engines.) (GM Blocks)

The ARCO Marine Zeus A275L Vortec Alternator is engineered for high energy production, making it the most powerful alternator in its class and size. Designed for demanding applications such as marine, RV, military, and commercial use, this alternator rapidly charges large battery banks while maintaining optimal operating temperatures. Its advanced cooling system, which includes heat shedding coatings, exterior-mounted rectifiers, dual cooling fans, and OEM-grade components, allows it to run 8 to 20% cooler than comparable models, ensuring increased performance and longevity. The A275L is optimized for high performance even at engine idle speeds, reducing the need for a separate generator and providing additional power directly from your engine.

Constructed with durability and efficiency in mind, the alternator features an E-Coat/Cerakote finish that absorbs less heat, enabling it to sustain higher amperage over extended periods. It is compatible with ARCO Zeus Bluetooth alternator regulators and lithium battery charging systems for maximum performance. Certified under SAE J1171 standards and proudly made in the USA, this alternator combines reliability with advanced technology to meet the rigorous demands of marine and industrial environments.

Technical specifications include a 12-volt system with 16 rotor poles and a large stator size of 138mm. Weighing approximately 15 pounds, it features an internal/external regulation capability with a default output voltage of 14.1 volts. The unit is equipped with a M8 thread post for side mounting, a standard 49mm 6-groove pulley, and a threaded M17 x 1.5 shaft. Its maximum output reaches up to 311 amps at cold start (9,000 RPM), with sustained hot cruising output of 227 amps at 6,000 RPM, and a hot idle output of 198 amps at 3,000 RPM. The alternator operates safely up to 110°C (230°F). It is compatible with GM Vortec/GM pad mounting feet, making it suitable as a replacement for many Mando-type alternators on Mercruiser and Volvo Penta marine engines, including models like 3.0GLM, 4.3GXi, and 5.7GXiL.

Features:

• High energy production for demanding applications

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

• Rapidly charges large battery banks

• Runs 8-20% cooler due to advanced heat shedding coatings and dual fans

• Optimized for high performance at idle speeds

• Reduces need for a generator by providing additional engine power

• Enhanced cooling with Cerakote/E-Coat for sustained high amperage

• Compatible with ARCO Zeus Bluetooth regulators and lithium charging systems

• SAE J1171 certified for reliability and safety

• Made in the USA for quality assurance