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Mastervolt Alpha Pro III [45513000]

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SKU OGL-69995
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Original price $673.99
Original price $673.99 - Original price $673.99
Original price $673.99
Current price $376.99
$376.99 - $376.99
Current price $376.99
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At OffGrid Living, we are proud to have the best refund and return policies in the industry. If you’re not satisfied with your purchase for any reason, you may return it to us within 30 days for a refund.

If you have a problem with our order (there are missing components, damages, or the product is not functioning), please reach out to us as quickly as possible. Some of the problems can be resolved by going through the product manual or the product FAQs.

Refer to our Refunds & Return Policy for more details.

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Once we receive your order, we will send you a confirmation email. Then we will process the order by confirming that the product is in stock and ready for shipment. If any of the items in your order are back-ordered, we will reach to you via email or phone and you may choose to either wait or receive a 100% refund.

Please allow 1-3 days for processing your order.

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We ship to the lower 48 continental United States only at this time.

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Mastervolt Alpha Pro III [45513000]

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. 

WarningWARNING: 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.

Product Specifications

Mastervolt Alpha Pro III [45513000] Product Specifications

Category Specification
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 12 V / 24 V
Connection Plug Regulator/Alternator Alpha/Mastervolt
Cooling Fanless
MasterBus Powering Yes
Display/Read-out LED display
Dimensions (H x W x D) 90 x 109 x 30 mm (3.5 x 4.3 x 1.2 in)
Weight 0.4 kg (0.9 lb)
Delivered With Battery temperature sensor with 6 m (20 ft) cable
Compliance 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 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 3 V
Field Current Up to 20 A
MasterBus Compatible Yes

Product Manual

Owner's Manual (pdf)

Product Warranty 

Mastervolt Product Warranty

Product FAQs

N/A