ARCO Marine Zeus A275L J-180 4-inch Alternator with Terminal Block for Marine and Commercial Applications

Zeus A275L J-180 4 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.


• 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 - External Only (These units will come with a terminal block and a P-Type harness. They will only work with an external regulator, such as an ARCO Zeus Bluetooth alternator regulator.)


• 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 designed to deliver the highest power output within its size class, making it ideal for demanding marine, RV, military, and commercial uses. Engineered for high energy production, this alternator efficiently charges large battery banks and supports peak electrical demands. Its advanced heat-shedding coatings, dual cooling fans, and exterior housing refrigerator work together to ensure the coolest operating temperatures, which enhances performance and prolongs component life. These features enable the alternator to run 8 to 20% cooler than traditional models, providing consistent power even during extended operation.

Optimized for performance at idle speeds, the ARCO Zeus A275L reduces reliance on external generators by producing additional power directly from your engine. The use of E-Coat or Cerakote coatings absorbs less heat, maintaining a cooler operating temperature and allowing for sustained high amperage output. When paired with an ARCO Zeus Bluetooth alternator regulator or lithium battery charging systems, users can maximize efficiency and performance. Certified under SAE J1171 standards and made in the USA, this alternator guarantees quality and reliability.

This unit features a 12-volt system with a P-type field, 16 rotor poles, and a 138mm stator size. It’s equipped with a large frame, weighs approximately 15 pounds, and includes a side-mount M8 battery post. The standard pulley is a 6-groove 49mm model, with a 17mm diameter shaft and threaded M17 x 1.5 mounting. The alternator's maximum output reaches 311 amps at cold start (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. Designed for external regulation, it comes with a terminal block and P-type harness, compatible with external regulators like the ARCO Zeus Bluetooth model. Its durable construction and high-performance features make it a versatile choice for replacing most Volvo Penta alternators using a 4 J180 saddle-style mount, ensuring reliable power delivery in the toughest environments.

Features:

• Engineered for high energy production in demanding applications

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

• Rapidly charges large battery banks for extended operation

• Runs 8-20% cooler due to heat-shedding coatings and dual cooling fans

• Optimized for performance at idle speeds, reducing generator dependence

• Advanced E-Coat/Cerakote coating minimizes heat absorption for sustained amperage

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

• SAE J1171 certified for quality assurance

• Made in the USA with durable construction and precision engineering