Alternators Alpha Compact 14/120 ar Alpha Pro III

The alternator is supplied complete with the Alpha Pro III smart charge regulator, a battery temperature sensor, and the oil-resistant wiring harness required for installation.

This alternator is designed to deliver high performance even at low engine speeds. It provides 70 A of current at idle, with a maximum rated output of 120 A at cruising speed.

Yes, thanks to the included Alpha Pro III regulator, this system is fully compatible with lithium-ion batteries, as well as conventional technologies such as lead-acid, gel, and AGM.

The Alpha Pro III regulator converts the standard alternator into a genuine 3-stage (Bulk, Absorption, Float) smart battery charger. It optimizes charging speed, protects batteries from overcharging, and compensates voltage based on temperature.

The system uses an included battery temperature probe to be mounted on your battery bank. The controller automatically adjusts the charging voltage with precise compensation of -30 mV/°C, protecting your batteries from overheating and extending their lifespan.

Yes, the Alpha Pro III regulator has two RJ-45 ports that allow direct connection to the MasterBus CAN-bus network. This enables full monitoring and configuration from compatible helm displays.

The Alpha Compact range has been specifically designed for the tight spaces of modern engines. This model features a compact footprint and weighs only 6.7 kg, making handling and installation significantly easier.

The Alpha Compact 14/120 alternator is designed to withstand confined and very hot marine environments. Its patented magnetic design allows it to support operating temperatures up to 120 °C without critical performance loss.

For a 12 V battery bank, the regulator applies by default a voltage of 14.25 V for the Bulk and Absorption phases, and 13.25 V for the Float (maintenance) phase. These values are fully adjustable via the MasterBus network.

The connection for the W signal, essential for the dashboard tachometer to function, is made very simply via a dedicated insulated quick-connect terminal directly on the alternator body.

Yes, if your installation requires an isolated ground mount (common on aluminum hulls), you can use insulating sleeves (available as an option) to insert on each side of the mounting holes to electrically isolate the alternator from the engine block.

You must use the wiring loom supplied with the Alpha Pro III regulator. This specific cable is hydrocarbon-resistant and ensures a reliable connection for the excitation current and sensors.

If the LED flashes 3 times every 2 seconds, this indicates an overcurrent in the excitation circuit. The regulator stops charging for safety and retries every 5 seconds. You must check the wiring between the regulator and the alternator to rule out any short circuit.

The Alpha Compact alternator is fitted with an efficient cooling system featuring a dual-fan design. This design enables it to maintain a high level of power output even in poorly ventilated engine compartments.

No, the Alpha Compact 14/120 model is specifically wound and designed for 12 V battery banks. For a 24 V installation, you must choose from the Mastervolt 28/xx series models (such as the 28/110 or 28/150).

The Alpha Compact 14/120 alternator is equipped with two robust M8-type positive output terminals. This allows for load distribution and ensures optimal and secure power transfer to your battery bank.

Yes, via the MasterBus network, the regulator can communicate directly with a MasterShunt battery monitor. This allows the regulator to use the shunt's ultra-precise data (temperature and actual terminal voltage) to fine-tune the charging cycle as accurately as possible.

No, lithium-ion batteries do not require external temperature compensation for charging. The temperature sensor is only necessary if you are charging battery banks of lead-acid, gel, or AGM types.

Thanks to the temperature sensor integrated into the Alpha Compact alternator, the regulator will automatically reduce the output power from 85 °C and will completely stop charging if the temperature reaches 120 °C, to protect the equipment autonomously.

Battery type configuration (lead-acid, gel, AGM or lithium) is done easily via the MasterAdjust software or a compatible display using the MasterBus network. This allows perfect adaptation of charging algorithms to your battery bank specifications.