Mastervolt Alpha Pro III 45513000 is an advanced 3-step charge regulator for standard and high performance alternators. Applications range from improving the performance of a standard alternator in a boat, to generator replacement, when combined with a high performance alternator.

The propulsion engine of your boat may be used to quickly charge your service batteries, either while cruising or taking a break. The Mastervolt Alpha Pro III ensures safe and fast charging, protecting both the batteries and the engine. From 10 years of experience, the Alpha Pro III brings higher power and improved ease of use, along with a modern look.

The Alpha Pro III measures the voltage and the temperature of your batteries to prevent overcharging, keeping them in the best condition. This charge regulator also monitors the engine load, reducing sound variations and wear & tear. The smart 'keep alive' feature solves a common problem causing unreliable tachometer readings. Using MasterBus it communicates RPM, alternator status and charge status for an intelligent power system.

Pull the max out of your alternator

The alternator that comes with the engine is not optimally suited for charging service batteries; instead it is designed for low cost and short charge cycles, it charges at a slow pace and is easily overheated. Replacing the standard regulator with the Alpha Pro III (not allowed on Euro 5/6 engines) optimizes the charging process, protecting against over-heating, over-charging and extends the lifetime of your batteries.

Super charge your system

Mastervolt recommends to combine the Alpha Pro III with a high performance alternator such as the reliable Mastervolt Alpha series for superfast charging at low RPM. With 20 amps of field current capability the Alpha Pro is the only 3-step regulator in the market capable of controlling alternators with outputs up to 400A.

Alpha Pro III: Fast charging, anytime, anywhere.

Alpha Pro III General Specifications:

Link to MasterShunt: yes

Connection to Mastervolt alternator: yes

Connection to Bosch alternator: yes, using a Bosch adapter cable (product code 45510500)

Nominal battery voltage: 12V / 24V

Connection plug regulator/alternator: Alpha/Mastervolt

Cooling: Fan-less

MasterBus Powering: yes

Display/read-out: LED Display

Mastervolt 45513000 Technical Specifications:

Charge characteristic: IUoUo, automatic / 3-step+ for Gel/AGM/flooded/Lithium Ion

Charge voltage Bulk/Absorption/Float: default setting for AGM, Gel and Lithium Ion (adjustable)

Absorption time: 4 hours, adjustable from 2 minutes to 12 hours

Temperature compensation: -30 mV / °C, -17 mV/ °F

DC voltage compensation: voltage drop compensation in DC cables up to 3V

Field current: up to 20 amps

MasterBus compatible: yes

Key Features

Transforms Alternator into a full temperature controlled 3-step charger

Reduces run time, saves fuel, reduces noise & emissions

Protects from overcharging & extends battery life

Balances engine load, reducing RPM variations

Compatible with standard & high performance alternators (200A ~ 400A models)

Integrated 'keep alive' feature for reliable tachometer readings

For all batteries, including Lithium Ion

For 12V & 24V systems

MasterBus compatible