Alpha Compact 28/150 VP for Volvo Penta Engines.

Alpha Compact alternators are optimised to deliver continuous high power output in energy storage applications. Combined with Mastervolt 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, MasterBus enabled 3-step charger.

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 VP alternators are fitted with a multi-groove pulley as standard (Mastervolt 48420170). Other Alpha Compact models come without pulley. Mastervolt offers a complete range of multi-groove pulleys.

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

Please note: product excludes Alpha Pro III charge regulator.

General specifications:

Charge regulation: via optional Alpha Pro III charge regulator (art.no. 45513000)

Isolated operation: yes, with optional isolation bushings

Rotational direction: clockwise

Galvanic isolation: non-isolated

Cooling: integrated dual fan

Mounting: swivel arm

Pulley included: yes (product code 48420170)

Weight: 7.9 kg (17.4 lb)

Technical specifications:

System voltage: 24V DC

Nominal current (at 6000 rpm, 25°C): 150A

Charge current (at 1800 rpm, 25°C): 30A

Cut-in speed: 1700 rpm

Max. rotational speed: 16,000 rpm

Power Take Off: 8.4 kW (11.4 hp)

Max. operating temperature: 120°C (248°F)

Connections: positive output stud = 2x M8; W (rpm) signal connection = isolated fast-on; field current connection = Mastervolt plug

Temperature sensor: integrated, RJ12 connection

Key Features

Plug & play solution

Suitable for high ambient temperatures

Patented magnetic design

Up to 40% lighter & 25% more compact than conventional alternators

Up to 30% lower fuel consumption

High charge current at idle RPM

Cable & electronics protected against oil, moisture & dirt

Original Equipment quality

Full 2 year warranty