Alpha Pro III Charge Controller

The Mastervolt Alpha Pro III charge regulator is a sophisticated charge management solution designed to optimize the efficiency of standard and high-performance alternators. It enables rapid and safe charging of service batteries from your boat's or vehicle's propulsion engine while protecting the entire system, including the engine and batteries.

The Alpha Pro III regulator offers several key features:

It turns any alternator into an advanced 3-stage charger (Bulk, Absorption, Float) with thermal control. It is compatible with all battery types, including lead-acid (flooded, gel, AGM) and lithium-ion. It protects against overcharging and preserves battery lifespan. It balances the charge on the engine, reducing RPM variations and noise. It includes a 'keep alive' function for reliable tachometer readings. It is MasterBus compatible, simplifying wiring and enabling optimal cooperation with other Mastervolt equipment. It is suitable for 12 V and 24 V installations.

The Alpha Pro III charge controller is compatible with a wide range of batteries, including lead-acid batteries (flooded, gel, AGM) and lithium-ion batteries. It includes default settings for AGM, gel, and lithium-ion batteries, which can be adjusted if needed.

The Alpha Pro III protects your batteries and engine in several ways:

It continuously measures battery temperature and voltage to prevent overcharging and overheating, thus extending battery life. It monitors engine load to reduce noise level variations, wear, and fatigue by balancing the load. It provides temperature compensation of -30 mV/°C (-17 mV/°F) and voltage drop compensation up to 3 V in DC cables.

Yes, the Alpha Pro III regulator is designed to be compatible with 12 V and 24 V electrical systems, making it versatile for various marine and vehicle applications.

The intelligent "keep alive" function built into the Alpha Pro III addresses a common issue affecting the reliability of the tachometer reading. It ensures that the RPM value is reliably transmitted over the MasterBus network, along with the alternator status and charge level, to power the system's intelligence.

Yes, the Alpha Pro III autopilot is equipped with an LED display that provides information and indicators on its operation.

The Alpha Pro III autopilot has compact dimensions of 90 x 109 x 30 mm (3.5 x 4.3 x 1.2 inches) and weighs 0.4 kg (0.9 lbs), making it easy to install in various spaces.

The Alpha Pro III is compatible with most negatively excited alternators, including standard and high-performance models. It can be used with Mastervolt alternators as well as other brands such as Bosch (via a specific adapter cable). It can handle induced currents up to 20 A, making it compatible with high-power alternators ranging from 200 A to 400 A, and even up to 600 A for certain Delstar models.

Yes, the Alpha Pro III regulator can be used with a Bosch alternator. For this, a Bosch adapter cable (part number 45510500) is required to ensure the connection.

Yes, there is an important restriction: replacing the standard regulator with an Alpha Pro III is prohibited on Euro 5/6 engines. It is crucial to verify your engine's compliance before any installation.

Yes, the Alpha Pro III regulator is fully compatible with Mastervolt’s MasterBus system. This compatibility simplifies wiring, saves space and weight, and enables optimal cooperation with other Mastervolt equipment in your installation.

Installation and work on the Alpha Pro III autopilot must be carried out exclusively by qualified and trained personnel, in compliance with local regulations and safety directives and measures. It is designed to be permanently connected to your DC electrical systems.

Yes, the Alpha Pro III controller ships with a battery temperature sensor and a 6-meter cable. This sensor is essential for temperature-compensated charging.

The Alpha Pro III continuously monitors battery temperature and voltage to optimize charging. It applies a temperature compensation of -30 mV/°C (-17 mV/°F) to adjust charging voltage based on temperature. It also compensates for voltage drop in DC cables up to 3 V, ensuring the correct charging voltage is delivered to the batteries even with longer cables.

Yes, it is mandatory to secure the DC wiring with fuses. Fuses must be installed between the Alpha Pro III alternator/regulator output and the battery, in accordance with the user manual and local regulations. This protects the installation from short circuits and polarity reversals that could seriously damage the batteries, alternator, regulator, and cables.

Yes, if a MasterShunt is installed in combination with the Alpha Pro III, you must connect the temperature sensor directly to the MasterShunt. The Alpha Pro III has a link to MasterShunt for this connection.

Mastervolt provides a two-year product warranty on the Alpha Pro III charge controller, starting from the date of purchase. This warranty is valid provided the product is installed and used in accordance with the user manual instructions. Improper installation or use may void the warranty.