Mastervolt Alpha Pro III

Upgrade your marine power system with the Alpha Pro III, an advanced 3-step charge regulator engineered for both standard and high-performance alternators. Designed to deliver fast and safe charging, the Alpha Pro III optimizes engine performance while extending the lifespan of your service batteries, ensuring reliable power whether you're cruising the open seas or docked at your favorite marina.

Enhanced Charging Efficiency for Boats and Marine Vehicles

The Alpha Pro III harnesses over a decade of expertise to provide a modernized, high-power solution that simplifies charging your service batteries. Whether you're navigating turbulent waters or enjoying a serene day on the water, this regulator maintains optimal battery health by accurately measuring temperature and voltage, preventing overcharging and ensuring your batteries remain in top condition.

Smart Engine and Battery Protection

Beyond battery management, the Alpha Pro III intelligently monitors engine load, reducing sound variations and minimizing wear and tear. Its smart ‘keep alive’ feature addresses common issues with unreliable tachometer readings, enhancing overall system reliability. When connected via MasterBus, it communicates critical data such as RPM, alternator status, and charge status, enabling the creation of intelligent power systems tailored to your marine setup.

Maximize Alternator Performance

Standard alternators included with marine engines are typically optimized for low-cost, short charge cycles, resulting in slow charging and potential overheating. By replacing the standard regulator* with the Alpha Pro III, you can:

• Optimize the charging process
• Protect against overheating and overcharging
• Extend the lifespan of your batteries

*Note: Replacement of the standard regulator is not allowed on Euro 5/6 engines.

Supercharge Your Power System

For ultra-fast charging at low RPMs, combine the Alpha Pro III with a high-performance alternator from the Alpha series. With a 20-amp field current capability, the Alpha Pro III is the only 3-step regulator on the market capable of controlling alternators with outputs up to 400 A, ensuring your marine power system delivers peak performance whenever you need it.

Key Features

Feature	Description
3-Step Charging	Transforms any alternator into a fully temperature-controlled 3-step charger.
Fuel and Emission Savings	Reduces run time, saves fuel, and decreases noise and emissions.
Overcharge Protection	Prevents overcharging to extend battery life.
Engine Load Balancing	Balances engine load to reduce RPM variations.
High Compatibility	Compatible with standard and high-performance alternators, including 200 A to 400 A models.
Keep Alive Feature	Ensures reliable tachometer readings.
Battery Type Versatility	Suitable for every battery type, including Lithium Ion.
Voltage Compatibility	Compatible with 12 V and 24 V systems.
MasterBus Integration	Simplifies wiring, saves space and weight, and ensures optimal cooperation with Mastervolt products.

Ideal Applications

The Alpha Pro III is versatile, enhancing the performance of standard alternators in boats and marine vehicles, and serving as a reliable generator replacement when paired with a high-performance alternator. Whether you're upgrading your current system or building a new power setup, the Alpha Pro III delivers unmatched efficiency and reliability.

Safety Information

WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit P65Warnings.ca.gov.

Additional Resources

Download the Owner's Manual (PDF)

Orders of physical products placed by 3 PM EST M-F typically ships the same day, if all requested items are in stock. Weekend orders will typically ship on Monday.

Shipping takes 2-7 days.

We currently ship to the Contiguous 48 States.

Life of Sailing merch is custom made for the customer after an order is placed. Total turnaround is typically 7-14 days from order to doorstep.