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12 Volt / 120 Amp | DC Alternator

12 Volt / 120 Amp | DC Alternator

  • SKU # 46614120
  • $0.00

Alpha Compact 14/120

Delivery includes Alpha Pro III charge regulator.


Alpha Compact alternators are optimized to deliver continuous high power output in energy storage applications. Combined with our Alpha Pro regulators, they create a high performance, plug-and-play charging solution. This combination is suitable for all battery types, including Lithium Ion.

These automotive style alternators offer many advantages. Most manufacturers offer a second alternator option, better known as PTO or Power Take Off option. This provides a straight-forward way to add an Alpha Compact as a second alternator. Alternatively, the stock alternator can be replaced with an Alpha Compact to obtain a powerful 3-step charger.

High performance plug & play alternators

Compared to conventional alternators, Alpha Compact offers lower weight, smaller dimensions and reduced fuel consumption. This is made possible by its open construction with double internal fans. An integrated temperature sensor controls the operating temperature.


The Alpha Compact series consists of 4 models in 12 V and 24 V. Special models for Volvo Penta engines are under development. Finding the right alternator for a specific application can be complicated. Please feel free to contact Mastervolt for assistance, we are happy to help you.


Freewheeling multigroove pulleys are available in various diameters and widths for an optimal pulley ratio and belt alignment. Exception to the rule is the Alpha Compact 14/200, which comes with a multigroove pulley as standard.

Isolation bushings - the negative pole of Alpha Compact alternators connects to the housing. Isolated operation is possible by installation of isolating bushings.

Modern Euro 5/6 engines include an auto start/stop system. Multiple solutions are available to detect a running engine.


Worldwide use in marine, mobile, infrastructure and industrial applications.



General specifications
Charge regulation an Alpha Pro III charge regulator comes standard with all models
Isolated operation yes, with optional isolation bushings
Rotational direction clockwise
Galvanic isolation non-isolated
Cooling integrated dual fan
Mounting swivel arm
Pulley included no
Weight 6.7 kg
14.8 lb
Technical specifications
System voltage 12 V
Nominal current (at 6000 rpm, 25 °C) 120 A
Charge current (at 1800 rpm, 25 °C) 70 A
Cut-in speed 1300 rpm
Max. rotational speed 20.000 rpm
Power Take Off (kW / hp) 3,4 / 4,5
Max. operating temperature 110 °C
230 °F
Connections positive output stud = 2x M8; W (rpm) signal connection = isolated fast-on; field current connection = Mastervolt plug
Temperature sensor integrated, RJ12 connection

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