ARCO Marine Zeus A225S J-180 3.15-Inch Alternator with Terminal Block for Marine and Commercial Use

Zeus A225S J-180 3.15 Alternator with 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. 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 - External Only
• 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 most small case styles using a 3.15 J180 saddle style mount (e.g., Hitachi, Lucas, Mitsubishi) Most Yanmars.

The ARCO Marine Zeus A225S J-180 3.15-inch alternator is engineered to deliver the highest power output within its size and class, making it an ideal choice for demanding marine, RV, military, and commercial applications. Its robust design ensures rapid charging of large battery banks, supporting extended operation and reliability. The alternator features advanced heat shedding coatings and dual cooling fans, allowing it to run 8 to 20% cooler than comparable models, which enhances performance and prolongs service life. Additionally, the exterior-mounted rectifier and high-quality OEM components contribute to consistent operation and durability.

This alternator is optimized for performance at idle speeds, helping reduce the need for a separate generator by generating additional power directly from the engine. The use of E-Coat or Cerakote advanced coatings further improves heat absorption, enabling the unit to sustain higher amperage levels over longer periods. For optimal performance, especially with lithium batteries or maximum output demands, pairing it with an ARCO Zeus Bluetooth alternator regulator is recommended. Certified according to SAE J1171 standards and proudly manufactured in the USA, this alternator offers dependable power with innovative thermal management.

Technical features include a 12-volt system with a 16-pole rotor, a 130mm stator size, and a compact frame weighing approximately 12 pounds. It provides a standard output voltage of 14.1 volts and features external regulation for precise voltage control. The unit's maximum cold RPM is 9,000, with a peak RPM capacity of 19,000. It comes with a side-mount M8 threaded battery post and a standard 49mm, 6-groove pulley, including hardware for installation. The internal diode assembly offers 50A avalanche-rated diodes, supporting high current loads. Its cooling and heat management capabilities, combined with a compact design, make it an excellent replacement for most small case alternators, including those used in Yanmar, Hitachi, Lucas, Mitsubishi, and similar models.

Features:

• Engineered for high energy production to support demanding power needs

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

• Rapidly charges large battery banks for extended operation

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

• Uses OEM components for durability and reliability

• Optimized for performance at idle speeds, reducing the need for a generator

• Advanced E-Coat/Cerakote coating minimizes heat absorption, supporting higher amperage output

• Compatible with ARCO Zeus Bluetooth alternator regulator for maximum performance

• SAE J1171 certified for quality and safety

• Designed for easy mounting on most small case styles using a 3.15-inch J-180 saddle mount