Mastervolt Alpha Pro III Charge Regulator

Mastervolt Alpha Pro III Charge Regulator

Mastervolt Alpha Pro III Advanced 3-step Charge Regulator

• Transforms every alternator into a full temperature controlled 3-step charger.


• Reduces run time, saves fuel, reduces noise and emissions.


• Protects from overcharging and extends battery life.


• Balances engine load, reducing RPM variations.


• Compatible with standard and high performance alternators, incl. 200 A ~ 400 A models.


• Integrated ‘keep alive’ feature for reliable tachometer readings.


• Suitable for every battery type, including Lithium Ion.


• Suitable for 12 V and 24 V system voltages.


• MasterBus compatible: simplifies wiring, saves space and weight, and creates optimal cooperation between Mastervolt products.

The propulsion engine of your boat or vehicles may be used to quickly charge your service batteries, either while cruising or taking a break. The advanced and powerful Alpha Pro III ensures fast and safe charging, protecting both the engine and the batteries. Building on 10 years of experience, the Alpha Pro III features a modernized look, higher power and improved ease of use.

The Alpha Pro III measures the temperature and the voltage of your batteries to prevent overcharging, keeping them in perfect condition. It also monitors the engine load, thus reducing sound variations, wear and tear. The smart ‘keep alive’ feature solves a common problem causing unreliable tachometer readings. Via MasterBus, it communicates RPM, alternator status and charge status to create intelligent power systems.

The alternator that comes with the engine is not optimally suited for charging service batteries. 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 optimizes this charging process, protects against overheating and overcharging and extends the lifetime of your batteries.

For superfast charging at low RPM, Mastervolt recommends to combine the Alpha Pro III with a high performance alternator such as the reputable Alpha series. 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 400 A!

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
12 V / 24 V

Connection plug regulator/alternator
Alpha/Mastervolt

Cooling
fanless

MasterBus powering
yes

Display/read-out
LED display

Dimensions, hxwxd
3.5 x 4.3 x 1.2 inch

Weight
0.9 lb

Delivered with
battery temperature sensor with 6 m (20 ft) cable

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
-17 mV/ °F

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

Field current
up to 20 amps

MasterBus compatible
yes

What's in the Box:

• Alpha Pro charge regulator


• Battery temperature sensor