ARCO Marine Zeus A225S 12V Single Foot Alternator with Isolated Ground and Terminal Block

Zeus A225S 1-2 Single Foot Alternator with Isolated Ground Terminal Block

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, running 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 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 - 130mm


• Frame Size - Small


• Weight - 12 lbs/5.4 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) - 254 Amps


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


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


• Max Continuous Operating Temperature - 110C / 230F

Mounting Application:

• Replaces most domestic styles using a single 1 or 2 mounting foot (e.g., Motorola, Prestolite). Requires Standard single V belt upgrading to a double V belt or Serpentine System

The ARCO Marine Zeus A225S is a high-performance 12-volt alternator designed for demanding marine, RV, military, and commercial applications. Engineered for maximum power output within its size class, this alternator features advanced cooling and high-quality components to ensure reliable operation even under extreme conditions. Its robust construction and innovative heat shedding coatings help keep operating temperatures 8-20% cooler than traditional alternators, which enhances performance and longevity. The exterior-mounted rectifier and dual cooling fans further contribute to efficient heat dissipation, allowing the alternator to sustain high amperage output during extended use. Whether charging large battery banks or supporting auxiliary systems, the Zeus A225S delivers rapid and consistent power, reducing dependency on external generators and optimizing engine efficiency.

Built with OEM components and certified under SAE J1171 standards, this alternator is designed for easy integration into existing systems. The internal/external regulation options, along with compatibility with ARCO Zeus Bluetooth regulators, provide versatile control over charging parameters, including lithium batteries. The unit’s compact frame and side-mount M8 threaded post make installation straightforward, while its durable Cerakote or E-coating finish ensures resistance to corrosion and environmental stressors. With a maximum cold start output of 254 amps and a sustained hot output of 187 amps at 6,000 RPM, the Zeus A225S is capable of meeting high power demands efficiently. Made proudly in the USA, this alternator combines advanced engineering with reliable performance to keep your systems running smoothly in the most challenging conditions.

Features:

• Engineered for high energy production, ensuring maximum power output

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

• Rapidly charges large battery banks for extended use

• Operates 8-20% cooler thanks to heat shedding coatings and exterior rectifier

• Dual cooling fans enhance heat dissipation and performance

• OEM components provide durability and reliability

• Optimized for performance at idle speeds to reduce engine load

• Creates additional power with your engine, reducing generator dependency

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

• Compatible with ARCO Zeus Bluetooth Alternator Regulator for enhanced control

• SAE J1171 Certified for industry compliance

• Available with internal or external voltage regulation options

• Made in the USA with high-quality materials