Mastervolt Alpha Alternator 12/90, incl. Alpha Pro III Charge Regulator - 48612090

SKU: EX 48612090

1-2 weeks delivery time

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The Mastervolt Alpha 12/90 (48612090) is a high-performance 12V alternator delivering 90A charging current and featuring isolated negative operation. Designed for fast, efficient charging even at low engine rpm, it’s ideal for marine, mobile, and off-grid applications. Included is the Alpha Pro III charge regulator, ensuring intelligent 3-stage charging for longer battery life. Supports flexible mounting, forced cooling, and connection to multiple battery banks via Battery Mate or isolators. Weight: 5.5 kg. Pulley diameter: 73 mm.

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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)