ARCO Zeus 225S High Output Alternator – 12V – 225A

The ARCO Zeus 225S is a high-output alternator, engineered to bridge the gap between heavy-duty power production and advanced digital control. In a “Small Case” package that rivals the output of much larger units, the Zeus 225S is the premier choice for modern vessels equipped with high-capacity Lithium (LiFePO4) or AGM battery banks.

Product Description

• Industry-Leading Power at Idle: The Zeus 225S is optimized for real-world cruising conditions, where engine RPMs are often low. While many high-output alternators struggle to produce current at low speeds, the Zeus 225S delivers a sustained 157 Amps at idle (3,000 Alt RPM). This ensures your batteries are receiving a significant charge the moment you start your engine, whether you are maneuvering in harbor or running the engine specifically for charging.
• Advanced Thermal Management: Heat is the enemy of amperage. The Zeus 225S is designed to run 8% to 20% cooler than competing alternators. This is achieved through a combination of dual internal cooling fans, a high-airflow frame, and advanced heat-shedding coatings (Cerakote or E-coat). By effectively managing its internal temperature, the Zeus 225S can maintain higher sustained output for longer periods without the thermal derating common in standard small-case alternators.
• The Zeus Digital Advantage: What sets the 225S apart is its integration with the ARCO Zeus Bluetooth Alternator Regulator. When paired, you gain total visibility and control over your charging system via the Zeus mobile app. This allows you to monitor alternator temperature, voltage, and current in real-time and select pre-set profiles specifically optimized for safe Lithium (LiFePO4) charging.

Key Features

• Massive 225A Output: Delivers 225 Amps (12V) of charging power in a compact frame size.
• Dual Internal Cooling Fans: Maximizes airflow for superior thermal performance.
• Optimized for Lithium: Seamlessly integrates with Zeus “smart” regulation to protect and rapidly charge modern Lithium banks.
• Bluetooth Enabled Monitoring: Full system diagnostics and adjustment via the ARCO Zeus app (requires Zeus regulator).
• NMEA 2000 Compatible: Connects to your vessel’s backbone for data display on modern multi-function displays (MFDs).

Technical Specifications

• Voltage: 12V
• Max Output Current (Cold, 9,000 RPM): – 254A
• Sustained Cruising Output (Hot, 6,000 RPM): – 187A
• Sustained Idle Output (Hot, 3,000 RPM): – 157A
• Cooling: Dual Internal Fans
• Ground Type: Case Ground or Isolated Ground (IG) versions available
• Regulator Type: Internal/External (IE) or External Only (EX) options available

Versatile Mounting Options The 225S is available in multiple housing styles to suit most common marine engines:

• Single Foot (SF): 1″ or 2″ spindle mount (Motorola/Delco style).
• Saddle Mount (DF315): 3.15″ saddle mount for most Yanmar, Hitachi, and Mitsubishi styles.
• Common Rail (CR): Specifically designed for post-2013 Yanmar Common Rail engines with a rear-exit B+ post.
• Vortec (VT): Pad mount found on many GM-based petrol engines (Mercruiser/Volvo Penta).

Note for Installation:

• To handle the significant torque produced by a 225A alternator, this unit must be installed with a multi-groove serpentine belt system.
  A Tachometer Signal Stabilizer (Part No. 15-TSS) may be required if your current tachometer is not adjustable.

Country of Manufacture: USA

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