ARCO Marine Zeus A225S Vortec Alternator with Regulator for Marine and Heavy-Duty Applications

Zeus A225S 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


• 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. Our advanced coating absorbs less heat, keeping the A225S cooler. This translates to more amperage for sustained periods.


• For maximum performance or lithium battery charging, use an ARCO Zeus Bluetooth alternator regulator.


• SAE J1171 Certified.


• Proudly made in the U.S.A.

Technical Specifications:

• Voltage - 12v


• Field Type - P


• Rotor Poles - 16


• Stator Size - 130mm


• Frame Size - Small


• Weight - 12lbs/6.7kg


• Regulation - Internal/External


• 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) - 254 Amps


• Sustained Cruising Output (Hot, 6,000 RPM) - 187 Amps


• Sustained Idle Output (Hot, 3,000 RPM) - 157 Amps

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 A225S Vortec Alternator is engineered to deliver the highest power output within its size and class, making it an ideal choice for marine, RV, military, and commercial applications. This alternator rapidly charges large battery banks and is designed to operate efficiently at idle speeds, providing reliable power when you need it most. Its advanced features, including heat shedding coatings, exterior-mounted rectifiers, and dual cooling fans, ensure the alternator runs 8 to 20% cooler than traditional models, which enhances performance and longevity.

The Zeus A225S is built with OEM components and optimized for high energy production, reducing the need for auxiliary generators by generating additional power directly from your engine. Its advanced coating, E-Coat/Cerakote, absorbs less heat, allowing the alternator to sustain higher amperage over extended periods. For maximum performance, especially for lithium battery charging, pairing it with an ARCO Zeus Bluetooth alternator regulator is recommended. The alternator is SAE J1171 certified and proudly manufactured in the USA, ensuring quality and durability.

Designed with a compact frame size and lightweight construction, this alternator features a 12V output with a 14.1V regulation default. It boasts a rotor with 16 poles, a 130mm stator, and a 49mm multi-groove pulley compatible with standard marine and automotive belts. The unit includes M8 side mount battery posts, M17 x 1.5 threaded pulleys, and high-rated avalanche diodes capable of delivering a maximum cold output of 254 amps. Its robust design supports continuous hot cruising output of 187 amps at 6,000 RPM and idle output of 157 amps at 3,000 RPM, making it suitable for demanding power environments.

Mounting is compatible with Mando type alternators utilizing Vortec/GM pad mounting feet, common on many Mercruiser and Volvo Penta marine engines. This versatile alternator replaces existing GM-based units and offers reliable, high-performance power for your marine or heavy-duty needs, backed by durable construction and advanced cooling technology for sustained peak operation.

Features:

• Engineered for high energy production to meet demanding power needs

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

• Rapidly charges large battery banks for extended use

• Runs 8-20% cooler thanks to heat shedding coatings, exterior rectifier, and dual cooling fans

• Built with OEM components for durability and reliability

• Optimized for performance at idle speeds, reducing reliance on generators

• Advanced E-Coat/Cerakote coating absorbs less heat for sustained amperage

• Pair with ARCO Zeus Bluetooth regulator for maximum performance and lithium battery charging

• SAE J1171 certified for quality standards

• Made in the USA with a compact, lightweight design for versatile mounting