621-Series, 150 Amp, Single Foot Alternator
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BALMAR621-Series, 150 Amp, Single Foot Alternator


Fulfilled from vendor
Model # 18087353 | Mfg # 621-150-K6UPC # 676205750820


621-Series, 150 Amp, Single Foot Alternator

Name Value
Dimensions 5.35" (136 mm) Diameter x 5.08" (129 mm) Length x 7.5" (190 mm) Height
ISO Approved USCG Title 33
CE Compliant
Mount Type Single Foot 1" or 2"
Outputs 1 Output
Rated Output Power - 2000 RPM Hot 65 Amps
Rated Output Power - 6000 RPM Hot 129 Amps
Type Alternator
Pulley Groove Type Serpentine Groove
Pulley Outside Diameter 2.45 Inches
Voltage 12 Volts DC
Warranty Details One Year Limited Warranty against Defects in Material or Workmanship

Product Overview

621-Series 150 Amp Alternator

Designed for Recreational Applications

  • 150 Amp in a Small Case Package
  • Single Foot 1" / 2” Mount
  • K6 Serpentine Pulley
  • Up to 65A at Idle Speeds
  • Patented Smart Ready® Technology
  • Dual Fan Cooling
  • High Airflow Frame
  • Maximum RPM: 12,000
  • USCG Title 33, ISO, SAE and CE Compliant
Balmar 621-Series Alternators deliver high-output performance in a compact case. While all Balmar’s high-output alternators are designed and recommended for use with their multi-stage voltage regulators, the 621-Series Alternator utilizes Balmar’s Smart Ready® Technology. Smart Ready® internal regulation enables the alternator to be used as a stand-alone, charge controller that is ideal as a built-in backup regulator for the cruiser, or as a full-time regulator for systems where Smart Multi-Stage Regulation is not required.  If battery loads are relatively small and your engine is running frequently, the alternator’s internal regulator may be sufficient to support your electrical needs without external regulation. If your vessel utilizes larger deep-cycle battery banks or the engine’s duty cycle is less frequent (as is the case in most sailing applications), the 6-Series Alternator combines and works seamlessly with Balmar’s ARS-5 Voltage Regulator or Max Charge Voltage Regulators.


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