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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.
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 go to P65Warnings.ca.gov.
Mastervolt Alpha Pro III is an advanced 3-step alternator charge regulator for boat and vehicle charging systems using standard or high-performance alternators. Designed to help service batteries charge quickly and safely, it monitors battery temperature and voltage while managing engine load for more consistent operation. The result is a smarter charging system that supports battery care, reduced engine runtime, and improved alternator performance.
The Alpha Pro III transforms an alternator into a temperature-controlled 3-step charger. Its 20-amp field current capability allows control of alternators with outputs up to 400 amps, making it suitable for systems ranging from standard alternator upgrades to high-performance charging setups. When paired with a Mastervolt Alpha high-performance alternator, it supports fast charging at low engine RPM and can serve as part of a generator replacement system.
Built-in battery temperature and voltage monitoring helps prevent overcharging, while engine-load monitoring helps reduce RPM variations, sound changes, and wear during charging. The integrated keep-alive feature supports reliable tachometer readings, and MasterBus compatibility enables communication of RPM, alternator status, and charge status with other Mastervolt products. The regulator is suitable for 12-volt and 24-volt systems and supports battery types including Lithium Ion.
Key Features:
- Temperature-controlled 3-step charging helps optimize alternator charging and protect batteries from overcharging.
- 20-amp field current capability controls standard and high-performance alternators with outputs up to 400 amps.
- Engine-load monitoring helps balance operation and reduce RPM variations during charging.
- Integrated keep-alive feature supports reliable tachometer readings.
- MasterBus compatibility simplifies system communication and coordination with Mastervolt products.
- Supports 12-volt and 24-volt systems and battery types including Lithium Ion.
Product Details:
- Brand: Mastervolt
- Product: Alpha Pro III advanced 3-step alternator charge regulator
- Part number: 45513000
- Intended use: Boat and vehicle service-battery charging systems
- Alternator compatibility: Standard and high-performance alternators, including 200-amp and 400-amp models
- System voltage: 12 volts and 24 volts
- MasterBus compatible
California Proposition 65 Warning: 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 go to P65Warnings.ca.gov.
Choose the Mastervolt Alpha Pro III for controlled, high-capacity alternator charging in marine and vehicle power systems.
SEO Meta Description: Mastervolt Alpha Pro III alternator charge regulator delivers temperature-controlled 3-step charging for 12V and 24V boat and vehicle battery systems.
Features:
- Temperature-controlled 3-step charging helps optimize alternator charging and protect batteries from overcharging.
- 20-amp field current capability controls standard and high-performance alternators with outputs up to 400 amps.
- Engine-load monitoring helps balance operation and reduce RPM variations during charging.
- Integrated keep-alive feature supports reliable tachometer readings.
- MasterBus compatibility enables communication with Mastervolt products and helps simplify system integration.
- Supports 12-volt and 24-volt systems and battery types including Lithium Ion.
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| Truck Freight: No |
| Oversized: No |
| Owners Manual Url: https://productimageserver.com/literature/ownersManual/69995OM.pdf |
