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" Alternator is engineered to deliver the highest power output within its class, making it ideal for demanding applications such as marine, RV, military, and commercial environments. Its robust design ensures rapid charging of large battery banks, enhancing overall energy efficiency and reliability. The alternator operates at cooler temperatures—8 to 20% cooler than comparable models—thanks to heat shedding coatings, exterior-mounted rectifiers, and dual cooling fans, which collectively improve performance and extend component lifespan.
Constructed with OEM-grade components and coated with advanced Cerakote or E-coating finishes, the Zeus A225S maintains optimal thermal conditions during extended operation. Its design is optimized for performance at idle speeds, reducing engine load and energy waste. For maximum output or lithium battery charging, pairing with an ARCO Zeus Bluetooth regulator maximizes efficiency and control.
This alternator features a compact frame size, weighing approximately 12 pounds, and is built with a 16-pole rotor and a 130mm stator for high energy production. The external regulation capability, combined with a 14.1V default voltage, ensures consistent power delivery. The unit includes a side-mount M8 threaded battery post, a 6-groove pulley, and a 17mm threaded shaft, making installation compatible with most small case styles such as Hitachi, Lucas, Mitsubishi, and Yanmar.
Capable of reaching a maximum RPM of 19,000 and producing a peak output of 254 amps at cold start, this alternator provides sustained power at various engine speeds, including 187 amps at cruising and 157 amps at idle. Its avalanche-rated diodes and high-capacity ratings ensure durability and reliable performance in rigorous conditions, making it a versatile choice for demanding energy needs. Proudly manufactured in the USA, the ARCO Marine Zeus A225S offers a dependable high-performance solution for those seeking efficient, long-lasting electrical power generation in challenging environments.

Features:

• Engineered for high energy production to maximize power output

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

• Rapidly charges large battery banks for efficient energy management

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

• Constructed with OEM components for durability and reliability

• Optimized for performance at idle speeds to reduce engine load

• Advanced coating (Cerakote/E-coating) absorbs less heat, maintaining cooler operation for sustained amperage

• Compatible with ARCO Zeus Bluetooth regulator for maximum performance or lithium battery charging

• SAE J1171 certified for safety and reliability

• Proudly made in the USA for quality assurance