- Description
- Ask a Question
-
Mastervolt 48612090 - Alpha Alternator 12/90, incl. Alpha Pro III Charge Regulator
The Mastervolt Alpha 12/90 is a rugged, isolated-output alternator designed to deliver fast and reliable charging to both starter and service batteries. With a maximum output of 90 amps at 12 volts, it provides sufficient power for all onboard consumers, even at low engine speeds. It comes standard with the advanced Alpha Pro III charge regulator, which manages 3-stage charging (bulk, absorption, float) for optimal battery performance and lifespan.
Alpha alternators are well-suited for marine and automotive environments, offering forced cooling, multiple mounting options, and compatibility with multibank charging setups when used with a Battery Mate or isolator. This model supports isolated electrical operation and performs well even in high ambient temperatures close to the engine.
Key Features:
- 90 A total charging current at 12 V
- Includes Alpha Pro III charge regulator (3-stage charging)
- Efficient charging even at low RPM
- Forced air cooling from pulley-mounted fan
- Isolated ground operation
- Support for charging multiple battery banks via Battery Mate
- Custom alternator brackets available from engine supplier
- Suitable as a generator alternative when paired with a large battery bank and inverter
General Specifications:
Part Number 48612090 Charge Regulation Alpha Pro III (included) Total Charge Current 90 A Voltage 12 V Isolated Operation Yes Rotational Direction Bi-directional (2 directions) Mounting Positions Five to six, six o’clock, five past six Belt Section 2×A Weight 5.5 kg (12.1 lbs)
Electrical Characteristics:
Charge Voltage – Absorption 14.25 V Charge Voltage – Float 13.25 V Nominal Pulley Diameter 73 mm (2.9 in)
Installation Notes:
- Dimensions available in technical drawings (see Downloads section)
- Supports multigroove pulley options in other Alpha models
- Consult engine supplier for custom brackets or factory-fit options
Documents
Alpha 12_90 III - DataSheet Size: 230,4 Kb -