ARCO Marine Zeus 24V 4kW LTO Alternator with Isolated Ground for Common Rail Engines

Zeus 24V 4kW Low Turn On (LTO) 3.15 Alternator with Isolated Ground (Common Rail)

The ARCO Zeus 24v 4kW LTO alternator turns on at lower RPMs, runs cooler, and provides more power than older designs that are larger and heavier. This alternator continuously generates over 1.4kW (51 Amps) at just under 1,500 RPM and almost 2.4kW (87 Amps) at 2,000 Alternator RPM. Put in real-world terms, a marine diesel engine idling at 750 RPM with a 2:1 pulley ratio is generating over 1.5kW (55 Amps), and a Mercedes Sprinter at 750 RPM with a 3.21:1 ratio is generating over 2.5kW (91 Amps)!

The ARCO Zeus 24v 4kW alternator turns on at lower RPMs, runs cooler, and provides more power than older designs that are larger and heavier. The newest generation of 24V performance has arrived.

Competitors 24V alternators utilize a 12V rotor and field current which is less efficient and limits output at all RPMs. ARCO utilizes a native 24V rotor and field current. This results in our 24V alternator running cooler than competitors 24V alternators, having a direct impact on the alternator lifespan.

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:
• Heat shedding coatings
• Rectifier located on housing exterior
• Dual cooling fans
• OEM components
• Optimized for performance at cruising speeds.
• Reduces the need for a generator by creating additional power with your engine.
• Unleash peak performance with E-Coat/Cerakote, keeping the high amp alternator cooler for sustained amperage output.
• Use the ARCO Zeus Bluetooth Alternator Regulator for maximum performance or lithium battery charging.
• SAE J1171 Certified.
• Proudly made in the U.S.A.

Technical Specifications:

• Voltage - 24v
• Field Type - P
• Rotor Poles - 16
• Stator Size - 138mm
• Frame Size - Large
• Weight - 15.89lbs/7.2kg
• Regulation - External Only
• Finish - (Black) E-coating
• Cut-In RPM - 1,072 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) at 27.5v - 144 Amps - 3,960 Watts 5.7Kw PTO
• Sustained Cruising Output (Hot, 6,000 RPM) at 27.5v - 130 Amps - 3,575 Watts 5.1Kw PTO
• Sustained Idle Output (Hot, 3,000 RPM) at 27.5v - 108 Amps - 2,970 Watts 4.2kW PTO
• Max Continuous Operating Temperature - 100C / 212F

Mounting Application:

• Must Be used on Yanmar Common Rail Engines introduced after 2013 (JH-CR, 3JH40, 4JH45, 4JH57, 4JH80, 4JH110).

The ARCO Marine Zeus 24V 4kW Low Turn On (LTO) Alternator, part number 4402, is engineered for high-performance applications in marine, RV, military, and commercial environments. Featuring a native 24V rotor and field current, this alternator delivers superior efficiency, cooler operation, and increased output compared to traditional designs. It continuously generates over 1.4kW (51 Amps) at just under 1,500 RPM and approaches 2.4kW (87 Amps) at 2,000 RPM, making it ideal for charging large battery banks rapidly and reliably. At idle speeds typical of marine diesel engines or vehicle engines, the Zeus alternator produces substantial power, reducing the need for additional generators and enhancing overall energy management.

Constructed with robust OEM components, the ARCO Zeus alternator features advanced heat shedding coatings and dual cooling fans to maximize operating temperatures up to 212°F. Its exterior-mounted rectifier and innovative design facilitate heat dissipation, promoting longer lifespan and sustained performance. The alternator’s high efficiency is supported by a large 138mm stator size and a 16-pole rotor, ensuring optimal electrical output at cruising speeds. The unit is also compatible with the ARCO Bluetooth Alternator Regulator, enabling precise performance tuning and lithium battery charging for modern energy systems.

Designed specifically for Yanmar Common Rail engines introduced after 2013, the alternator is suitable for applications where space and weight are critical. It features a large frame, side-mount M8 threaded post, and a standard 49mm multi-groove pulley with included hardware. The alternator's regulation is external, and it supports maximum RPMs up to 19,000, with a cut-in RPM of approximately 1,072. Its durable black E-coat finish adds corrosion resistance, making it suitable for harsh environments. The ARCO Marine Zeus alternator is proudly manufactured in the USA, certified to SAE J1171 standards, and designed to unleash peak performance while extending service life in demanding conditions.

Features:

• Engineered for high energy production with efficient native 24V rotor and field current

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

• Rapidly charges large battery banks with high amperage output

• Operates cooler thanks to heat shedding coatings and dual cooling fans

• Rectifier located on housing exterior for enhanced heat dissipation

• Supports high RPM operation up to 19,000 RPM

• Compatible with Bluetooth regulator for optimal performance and lithium charging

• Constructed with OEM components for durability and longevity

• Designed for Yanmar Common Rail engines introduced after 2013

• Protected with corrosion-resistant black E-coating finish