ARCO Marine Zeus A275L J-180 4-Inch Alternator with Regulator for Marine and Commercial Use

Zeus A275L J-180 4 Alternator with Regulator

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.


• It runs 8 - 20% cooler than incumbent alternators due to heat-shedding coatings, a refrigerator on the housing exterior, dual cooling fans, and OEM components.


• It is 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 A275L cooler. This translates to more amperage for sustained periods.


• Use an ARCO Zeus Bluetooth alternator regulator or lithium battery charging for maximum performance.


• SAE J1171 Certified.


• Made in the U.S.A.

Technical Specifications:

• Voltage - 12v


• Field Type - P


• Rotor Poles - 16


• Stator Size - 138mm


• Frame Size - Large


• Weight - 14.9 lbs/6.7 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) - 311 Amps


• Sustained Cruising Output (Hot, 6,000 RPM) - 227 Amps


• Sustained Idle Output (Hot, 3,000 RPM) - 198 Amps


• Max Continuous Operating Temperature - 110C / 230F

Mounting Application:

• Replaces most Volvo Penta alternators using a 4 J180 saddle-style mount

The ARCO Marine Zeus A275L J-180 4-Inch Alternator is engineered to deliver the highest power output within its size class, making it an ideal choice for marine, RV, military, and commercial applications. This alternator is specially designed to rapidly charge large battery banks, ensuring reliable power supply for demanding environments. Its advanced heat-shedding coatings, dual cooling fans, and OEM components enable the alternator to operate at temperatures 8 to 20% cooler than traditional models, thereby enhancing performance and durability.
Built for high energy production, the A275L is optimized for performance at idle speeds, reducing the reliance on separate generators and creating additional power directly from your engine. Its robust construction features an E-Coat or Cerakote finish that absorbs less heat, allowing it to sustain higher amperage over extended periods. For maximum efficiency, pairing this alternator with an ARCO Zeus Bluetooth regulator or lithium battery charging system is recommended. Certified under SAE J1171 standards and proudly manufactured in the USA, the A275L guarantees quality and reliability.
The alternator operates at 12 volts with a rotor featuring 16 poles and a large 138mm stator. Weighing approximately 15 pounds, it includes a side-mount M8 threaded battery post and a standard 6-groove pulley. Its design accommodates internal regulation with an optional external regulation adaptor, providing flexibility for various systems. The maximum output capacity reaches 311 amps at 9,000 RPM, with a hot cruising output of 227 amps at 6,000 RPM and an idle output of 198 amps at 3,000 RPM. Its maximum continuous operating temperature is 230°F, ensuring reliable operation even under strenuous conditions.
This alternator replaces most Volvo Penta models using a 4 J180 saddle-style mount, making it a versatile upgrade for many existing setups. Its durable construction and high-performance features make the ARCO Marine Zeus A275L J-180 4-Inch Alternator a dependable power solution for marine, RV, military, and commercial applications, capable of delivering consistent, peak performance in demanding environments.

Features:

• Engineered for high energy production to meet demanding power needs

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

• Rapidly charges large battery banks for reliable operation

• Operates 8-20% cooler thanks to heat-shedding coatings, dual cooling fans, and OEM components

• Optimized for performance at idle speeds to reduce engine load

• Reduces the need for a separate generator by generating additional power from your engine

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

• Compatible with ARCO Zeus Bluetooth alternator regulator and lithium battery charging systems

• SAE J1171 Certified for quality assurance

• Made in the USA with durable construction and high-quality components