Balmar 621120DV 120 Amp 12V Marine Alternator Single Foot Spindle Mount Dual Vee Pulley

The Balmar 621120DV is a high-output marine alternator from Balmar's popular 6-Series line, designed specifically for recreational marine applications. This compact alternator delivers 120 amps of charging power at 12 volts, providing reliable performance for boats with moderate to large battery banks.

Key Features:

• 120 amp output at 12 volts for robust charging performance
• Single foot spindle mount design with 1-2 inch mounting configuration
• Dual deep vee pulley accepts 3/8", 7/16", and 1/2" belts
• Isolated ground construction for improved electrical system protection
• Patented Smart Ready® Technology allows use with external regulation or as stand-alone internally regulated system
• Built-in 14.1-volt charge controller serves as backup or full-time regulator
• Dual fan cooling system ensures optimal operating temperatures
• Compact small-case design for easy installation in tight engine compartments

Mounting Compatibility:

• 1" Motorola-style mounting: Compatible with Westerbeke, Lehman, Hino, and Pathfinder engines
• 2" Delco-style mounting: Compatible with Volvo Penta (gas and diesel), John Deere, Perkins, Mercruiser, Pleasurecraft, Crusader, Indmar, Marine Power, and other GM-based marine engines

This alternator is engineered to replace most OEM alternators and can be used with Balmar's ARS-5 or Max Charge voltage regulators for optimized multi-stage charging of deep-cycle battery banks. The internal regulator provides sufficient charging for vessels with smaller battery loads and frequent engine runtime, while external regulation is recommended for larger battery banks or less frequent engine operation typical in sailing applications.