621-Series, 120 Amp, Single Foot, Alternator Kit
Mouse Over to Zoom
Click to Enlarge

BALMAR621-Series, 120 Amp, Single Foot, Alternator Kit


Fulfilled from vendor
Model # 18087973 | Mfg # 621VUP-MC-120-KUPC # 676205750950


621-Series, 120 Amp, Single Foot, Alternator Kit

Name Value
Dimensions 5.68" (145 mm) Diameter x 5.10" (130 mm) Length x 9.67" (246 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 60 Amps
Rated Output Power - 6000 RPM Hot 109 Amps
Type Alternator/External Smart Regulator
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 120 Amp Alternator Kit

Designed for Recreational Applications

  • 120 Amp in a Small Case Package
  • Single Foot 1" / 2” Mount
  • K6 Serpentine Pulley
  • Up to 60A 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).

Max Charge MC-614 Voltage Regulator

  • 7 Selectable Programs for Marine Batteries
  • 15 Amp Maximum Field Current
  • Advanced Programming Modes
  • Alternator & Battery Temperature Sensing & Control
  • Exclusive Belt Load Manager Function
  • Bright LED Display and Easy Programming Mode
  • Can be Used in Twin-Engine Applications with Centerfielder Ii Temperature Sensor Cables
  • Temp Sensors can be used for 12 Volt and 24 Volt Systems
  • MC-TS-A – Alternator Cable, 54” Length
  • MC-TS-B – Battery Cable, 240” Length

  • Advice

    The West Advisor articles have answered boaters' questions and provided solutions to boating problems for more than 20 years. West Marine has compiled one of the Web's most comprehensive collections of technical boating information articles.

    Related West Advisor Articles


    Product Q & A