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Alpha Pro III

Advanced 3-step charge regulator for standard and high performance alternators

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. 

Pull the max out of your alternator

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. 

(* not allowed on Euro 5/6 engines)

Super charge your system

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!

Alpha Pro III: Fast charging, anytime, anywhere. 

Features

  • 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.

Applications

Applications range from improving the performance of a standard alternator in a vehicle or boat, to generator replacement, when combined with a high performance alternator. 

Product code: 45513000
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Specifications

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 output voltage 12 V / 24 V
Cable length regulator/alternator 1.5 mtr / 5 ft oil resistant connection cable
Cable length temperature sensor 6 meter
Connection plug regulator/alternator Alpha/Mastervolt
Cooling fanless
MasterBus powering yes
Display/read-out LED display
Dimensions, hxwxd 90 x 109 x 30 mm
3.5 x 4.3 x 1.2 inch
Weight 0.4 kg
0.9 lb
Delivered with battery temperature sensor with 6 m (20 ft) cable
Approvals CE
 
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 van 0 minuten to 10 hours
Temperature compensation -30 mV / °C
-17 mV/ °F
Voltage compensation voltage drop compensation in DC cables up to 3 V
Alternator type all alternators with negative excitation
Field currents up to 20 amps
MasterBus compatible yes
 
 

Downloads

Certificates

Alpha Pro III

EU DoC Alpha Pro

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Installation manuals

Alpha Pro III

Appendix Alpha Pro Alternator (English)

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User manuals

Alpha Pro III

User's manual Alpha Alternator and Alpha Pro regulator (English)

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3D product drawings

3D-drawing Alpha Pro regulator (zipped STEP file)

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Accessories

Bosch adapter cable

Connection cable for any other brand of alternator that has a standard Bosch connector. View product

Alternator...

When using the Alpha Pro in combination with non-Mastervolt alternators, this alternator... View product