ARCO Marine Zeus A225S 3.15 Alternator with Isolated Ground and Terminal Block

Zeus A225S 3.15 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 small case styles using a 3.15 saddle style mount (e.g., Hitachi, Lucas, Mitsubishi). Most Yanmars. Requires Standard single V belt upgrading to a Serpentine System

The ARCO Marine Zeus A225S 3.15 Alternator is engineered for high energy production, making it the highest power output alternator in its size and class. Its design ensures reliable performance across marine, RV, military, and commercial applications, providing rapid charging for large battery banks. Built with advanced features, the A225S operates at cooler temperatures—8-20% cooler than traditional alternators—thanks to heat shedding coatings, exterior-mounted rectifiers, and dual cooling fans, which collectively extend component lifespan and enhance overall performance. The inclusion of OEM components and an optimized design for idle speed operation ensures consistent power generation even under variable engine conditions.

Features:

• Engineered for high energy production, maximizing power output in its class

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

• Rapidly charges large battery banks for extended operational capacity

• Operates 8-20% cooler than incumbent alternators due to heat shedding coatings, exterior rectifier placement, and dual cooling fans

• Built with OEM components for durability and reliability

• Optimized for performance at idle speeds, reducing engine load

• Reduces the need for a dedicated generator by generating additional power with your engine

• Enhanced cooling with advanced coatings and dual fans to maintain cooler operating temperatures

• Compatible with ARCO Zeus Bluetooth Alternator Regulator for maximum performance and lithium battery charging

• SAE J1171 Certified for quality and safety standards

• Available with internal or external voltage regulator options

• Proudly made in the U.S.A., ensuring quality craftsmanship