Alpha 12/130 III Alternator with Alpha Pro III

The Alpha 12/130 III alternator is supplied with its Alpha Pro III smart charge regulator and a standard double V-belt pulley.

This alternator delivers a total charging current of 130 A at 12 VDC. Its design allows it to provide full charging power even at low RPMs (idle).

Yes, with the included Alpha Pro III regulator, this system is fully compatible with both lead-acid and lithium-ion (Li-ion) battery banks.

The Alpha 12/130 III alternator is fitted with a bidirectional fan. It can therefore spin either clockwise or counterclockwise without affecting cooling.

Yes, unlike some compact models, the Alpha 12/130 III alternator features an isolated design. The negative output is not connected to the metal housing, which helps protect sensitive electronics in some marine engines.

Yes. By adding a battery splitter (such as a Battery Mate model), you can use this alternator to simultaneously and safely charge two or three battery banks (for example, a starting bank and a service bank).

It is supplied as standard with a double V-belt pulley (2xA section) with a nominal diameter of 89 mm.

Yes, although it ships with a double V-belt pulley, this model can be fitted with a multi-groove pulley (PK profile) to match your specific drive belt.

Yes. Its bidirectional fan provides strong forced cooling, allowing it to maintain high performance even in engine rooms where ambient temperature exceeds 40 °C.

It features a "six hours" mounting type. It fits many engine mounts, but installation may require a custom bracket depending on your engine brand and model.

Standard alternators require high engine RPM to deliver full power output. The Mastervolt Alpha alternator is specifically optimized to provide maximum charging current at low RPM, reducing the engine runtime needed for recharging.

Yes, this is one of its primary applications. It is frequently installed as a secondary alternator dedicated exclusively to the house battery bank, while the original alternator manages the starter battery.

The Alpha Pro III regulator uses a 3-stage smart charging process with precise voltages: 14.25 V in Absorption phase and 13.25 V in Float phase (maintenance).

This marine alternator weighs 10.1 kg.

Yes, Mastervolt does not provide mounting brackets. You must use the alternator bracket provided by your engine manufacturer (PTO option) or have a robust custom bracket fabricated by a professional to withstand vibrations.

Yes, the conversion of mechanical energy into electrical energy has an efficiency of around 50 %. It is important to check that your engine has sufficient power reserve to drive this 130 A alternator at full load.

The regulator intelligently controls the voltage and output current of the alternator. It ensures fast and safe charging while preventing overcharging, which significantly extends the lifespan of your batteries.

No, this specific model (reference 48612130) is designed for 12 VDC systems only. If you have a 24 V battery bank, you will need to choose from the Alpha 24/75, 24/110 or 24/150 models.

Yes, for safety reasons, it is mandatory to install protective fuses on the wiring connecting the alternator output and the regulator to the batteries.

Yes. When paired with a high-capacity battery bank, this high-performance alternator serves as a silent and efficient alternative to installing a generator by massively recharging the batteries while the main engine is running.