Alpha 24 V 150 A EVO Alternator with Alpha Pro III

Mastervolt's EVO series is specifically designed for harsh marine environments. Unlike standard automotive models, it can operate continuously in engine rooms reaching high temperatures (performance maintained above 40 °C) while delivering high output power even at low rotational speeds.

This alternator delivers a powerful charging current of 150 Amperes at a voltage of 24 Volts. This high capacity enables ultra-fast recharging of your service battery bank, ensuring excellent efficiency even when your boat's engine is idling.

Yes, this kit includes the advanced Alpha Pro III charge regulator (part number 45513000). This external regulator turns the alternator into a true smart charger by applying an optimized and secure charging cycle for your batteries.

Yes. Paired with the Alpha Pro III regulator, the alternator is fully compatible with lithium-ion battery banks, as well as conventional technologies such as flooded lead-acid, Gel, and AGM.

The system comes with a battery temperature sensor. Connected to the Alpha Pro III regulator, it dynamically adjusts charging voltage based on battery heat (thermal compensation at -30 mV/°C for 12V, doubled for 24V), preventing overheating and extending battery bank lifespan.

Yes, integration is done via the Alpha Pro III regulator, which features two RJ-45 data ports. This enables native connectivity to the MasterBus ecosystem for monitoring, configuration, and communication with other Mastervolt equipment on board.

Thanks to the MasterBus connection, the regulator can communicate directly with a MasterShunt installed as close as possible to the battery. It detects the actual voltage at the battery terminals and automatically compensates for voltage drops in the wiring (up to 2.5 V of detectable loss).

The Alpha Pro III regulator uses an intelligent charging algorithm called 3-Step+ with three phases:

Bulk: Fast charge at maximum current.Absorption: Constant-voltage charge to complete filling (adjustable duration from 0 to 10 hours).Float (Maintenance): Voltage maintenance to keep batteries at 100% capacity without overcharging.

No, Lithium-ion batteries do not require temperature compensation. The provided temperature sensor is, however, essential for safely and efficiently charging lead-based batteries (flooded, Gel, AGM).

A type N alternator (negative excitation) means the regulator controls the alternator's magnetic field by modulating the connection to ground (negative pole), while the positive pole is permanently powered. The Alpha Pro III is specifically designed to drive this type of technology.

Configuration is done easily via the MasterBus network using a compatible display or the MasterAdjust software on a computer. You can select the system voltage and battery type so the algorithm automatically adapts to your bank's specifications.

No, this high-performance alternator is designed to operate exclusively with an external regulator such as the Alpha Pro III. It is the regulator that manages the alternator excitation and ensures secure, high-performance charging tailored to your batteries.

MasterBus connections must be made using standard straight RJ-45 patch cables. When installing, it is critical to follow the power distribution rule on the network and never create a loop or ring network.

The Alpha 24V 150A EVO alternator assembly weighs approximately 13.1 kg. This is a robust piece of equipment, built with high-quality components to withstand the vibrations and extreme temperatures found in marine engine rooms.

The D+ LED serves as a charge state indicator and diagnostic alert. For example, it will emit 3 short flashes every 2 seconds if the field current is too high, or 2 flashes if the battery voltage is excessive, which greatly simplifies troubleshooting.

No, this specific model (reference 48624152) is designed exclusively for battery banks operating on 24V DC. Mastervolt offers other alternator models in the Alpha range for vessels equipped with 12V systems.

For a 24V system with lead-acid batteries by default, the bulk/absorption voltage is 28.5 V (i.e., 14.25 V x 2) and the float voltage is 26.5 V (i.e., 13.25 V x 2) at a reference temperature of 25°C. These values remain fully configurable.

This alternator delivers a very high charging current (150A), so batteries may overheat. If your batteries are regularly exposed to ambient temperatures above 30 °C, it is strongly recommended to install a forced-air ventilation system or relocate them to a cooler area.

If no LED indicator is lit, first check whether the battery fuse has blown or if the black ground cable (GND) is improperly secured. Also ensure the engine is running, as the absence of voltage at the ignition terminal prevents the regulator from activating.

Mechanical installation requires checking the compatibility of your engine mounts and calculating the correct pulley ratio. Ensure the pulley diameter allows the alternator to spin at an optimal speed to generate power at idle, without exceeding its maximum rotational speed at full throttle.