SKU: 75727043701

Mastervolt Alpha Pro Iii Charge Regulator

Sale price$160.65 Regular price$178.50
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Ships within 48 hours · Estimated delivery Aug 13 - Aug 18

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Description

Mastervolt Alpha Pro Iii Charge RegulatorMastervolt Alpha Pro III Advanced 3 step Charge Regulator Model: 45513000 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

Mastervolt Alpha Pro III Advanced 3-step Charge Regulator

Model: 45513000
  • 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!

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 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
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 75727043701

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★★★★★ 4
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Model: iPad 9th/8th/7th Gen 10.2 Inch, Model: iPad 9th/8th/7th Gen 10.2 Inch
The ProCase screen protectors fit my iPad 7th generation well and provide clear protection without affecting touch sensitivity or screen clarity. The installation process was very simple, Unfortunately I did have some trouble with bubbles forming in the corner after applying the first one, which was a bit difficult to fully smooth out. The second protector went on slightly better, but it still required extra effort to get a perfect finish. Despite that issue, the screen protector still does its job well in protecting against scratches and daily wear. It also comes in a 2 pack, which adds good value in case one is applied incorrectly. It’s a solid product for protection, but the installation can be a little tricky if you want a completely flawless, bubble free look
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Reviewed in the United States on May 22, 2026
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LaQuetta Watson
Draper, US
★★★★★ 5
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Model: iPad A16 11th 2025 /10th 2022
Perfect, really easy to apply as well. Looks great and fits perfectly. I also noticed there not much glare
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Reviewed in the United States on May 29, 2026
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Bonnie Mobilio
Lexington, US
★★★★★ 5
Great product and reasonably priced!
Model: iPad A16 11th 2025 /10th 2022
Reasonably priced! Well packaged and protected! Very easy to install and I love it!
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Reviewed in the United States on June 7, 2026
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Liusmary feria guerra
Phoenix, US
★★★★★ 5
Excellent Screen Protector – Easy to Install and Crystal Clear
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am very pleased with this tempered glass screen protector for my iPad. Installation was quick and easy, with no bubbles, and the fit is perfect. The screen remains crystal clear, and the touch sensitivity is exactly the same as before. It provides great protection against scratches and everyday wear while maintaining the original display quality. I also appreciate that the package includes two protectors, which offers excellent value for the price. Highly recommended for anyone looking to keep their iPad screen safe and looking brand new!”
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