ARCO Zeus A275L J180 4in Alternator Isolated Ground

The ARCO Zeus A275L J180 4" Alternator with Isolated Ground and Terminal Block delivers the highest power output in its size/class. Engineered for high energy production, this unit provides reliable, efficient charging for demanding applications and keeps critical systems online when it matters most.

• Isolated ground design supports multiple battery banks with minimized cross-talk and enhanced safety.
• Compact 4" form fits tight spaces without sacrificing power output.
• Integrated terminal block for quick, secure wiring and easy installation.
• Rapidly charges large battery banks to accelerate readiness and reduce downtime.
• Engineered for robust performance with cooler operation under heavy loads.
• Versatile for marine, RV, military, and commercial use—a dependable power solution across demanding environments.

Upgrade to the Zeus A275L for dependable, high-output charging that keeps your systems powered where you need it most.

Zeus A275L J180 4" Alternator with Isolated Ground & 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.
• 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, keeping the A275L cooler for sustained amperage output.
• Use the ARCO Zeus Bluetooth Alternator Regulator for maximum performance or lithium battery charging.
• SAE J1171 Certified.
• Models available with internal/external voltage regulator.
• Proudly 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 - 110°C / 230°F

Mounting Applications:

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