High-performance alternator designed for high-demand 24 V charging applications

Engineered for serious marine, RV and off-grid systems, this 24 V high-output alternator delivers class-leading performance at low RPMs for optimal charging even when the engine is idling. With native 24 V rotor technology, rugged cooling, and robust construction, it offers a reliable solution to rapidly charge large battery banks and reduce dependence on generators.

Key Features

  • Low turn-on at idle RPM: Begins meaningful output (~51 A) at just under 1,500 rpm for efficient charging in anchored or low-speed conditions.
  • High continuous output: Sustains ~108 A (~2.97 kW) at 3,000 rpm under hot conditions, enabling large battery bank replenishment.
  • True 24 V rotor design: Native 24 V field current ensures cooler operation and higher efficiency than 12 V-based 24 V variants.
  • Built for harsh environments: Features heat-shedding coatings, external rectifier location and dual cooling fans to handle demanding duty.
  • Versatile mounting compatibility: Includes options for single-foot, J180 saddle, common-rail, and clutch-pulley installations across multiple platforms.
  • Optimised for lithium-battery systems: Designed to work seamlessly with smart regulators for LiFePO₄ and other advanced battery chemistries.
  • Generator replacement capability: Enables engine-based high-power charging to minimise or eliminate generator usage.
  • Manufactured in the USA: Built to industrial standards including SAE J1171 certification and designed for marine/industrial duty.

Installing this alternator ensures your battery bank gets top-tier charging performance under real-world conditions without the need for constant generator backup.

Technical Specifications
Voltage 24 V
Cut-In Alternator RPM 1 072 rpm (alternator) approx
Maximum Alternator RPM 19 000 rpm
Stator Size 138 mm
Rotor Poles 16
Max Output (Cold, 9 000 rpm) 144 A (~3 960 W)
Sustained Idle Output (Hot, 3 000 rpm) 108 A (~2 970 W)
Sustained Cruising Output (Hot, 6 000 rpm) 130 A (~3 575 W)
Regulation Type External regulator required
Mounting Options Single-foot, J180 saddle, common-rail, clutch pulley
Finish E-coat/Cerakote with dual cooling fans
Certification SAE J1171 certified
SKU ARC.4403
Model # 4403
UPC/EAN 634707386244
Brand Arco Marine
Shipping Weight 7.0000kg
Shipping Width 0.172m
Shipping Height 0.142m
Shipping Length 0.215m
Shipping Cubic 0.005251160m3
Unit Of Measure Each

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