A275L-12-SF12-EX-49K6 - Arco Marine Zeus A275L 1"-2" Single Foot Alternator w/Terminal Block

Zeus A275L 1"-2" Single Foot 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, 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 - 110°C / 230°F

Mounting Application:

• Replaces most domestic styles using a single 1” or 2” mounting foot (e.g., Motorola, Prestolite)

The ARCO Marine Zeus A275L is a 12v, single-foot alternator designed for high energy production in demanding environments. This unit, part number A275L-12-SF12-EX-49K6, is suitable for marine, RV, military, and commercial applications requiring efficient power generation for large battery banks. It features a 16-rotor pole design with a 138mm stator, delivering a maximum output of 311 Amps cold at 9,000 RPM and a sustained cruising output of 227 Amps hot at 6,000 RPM. The alternator is engineered for cooler operation, running 8-20% cooler than comparable units due to heat-shedding coatings, an exterior rectifier, and dual cooling fans. It maintains optimal performance at idle speeds, generating 198 Amps hot at 3,000 RPM, which can reduce reliance on generators. The A275L utilizes E-Coat/Cerakote finishes for enhanced durability and heat absorption. Regulation is external only, and it is compatible with ARCO Zeus Bluetooth alternator regulators. The unit is SAE J1171 certified and manufactured in the U.S.A.