SKU: 82141227512

Mastervolt Alpha Pro III [45513000]

Sale price$158.40 Regular price$176.00
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Description

Mastervolt Alpha Pro III [45513000]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

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.


Owner's Manual (pdf)
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: 82141227512

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4.4 ★★★★★
Based on 14 reviews
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M
Verified Purchase
michael jones
Belleville, US
★★★★★ 5
LOVE these LIGHTS !!!
Color: 2Pcs 18W LED Flood Light, Color: 2Pcs 18W LED Flood Light
i put 2 on the front of my 24" ariens snowthrower and it actually was to much !!! using one now and PLENTY of light !!! i have lots of dewalt batteries and i bought a adapter that allows me to put a battery in and has switch and fuse , wired to light and used one of my old 2AH batteries and it lasted 2.5 hours no problem , non stop . my newer batteries are 6 and 8 AH and last up to 8 hours before recharge . LOVE these LIGHTS !!! installing one on ladder rack on rear of truck . you know how many times that will be used on a late evening or early start so i can see to load or unload .
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 6, 2026
I
Verified Purchase
ITO
Houston, US
★★★★★ 5
Good bang for the buck.
Color: 2Pcs 18W LED Flood Light
I have bought 10 of these now. I put them on my work trailer and use them for reverse lights. They are cheap, easy to install, and they work very well. Now and then, I break one; they are exposed on my trailer and stuff happens, and these are so cheap it's not a big deal to replace them.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 15, 2026
J
Verified Purchase
Jason Ross
Whiting, US
★★★★★ 5
used for a snowblower light upgrade
Color: 2Pcs 18W LED Flood Light
I replaced the halogen bulb that came with my snowblower with these bad boys. Talk about a night and day difference! I was able to use two existing holes on the top of the blower and the included brackets to mount them. I also had to get a rectifier that converted the AC 24V to the 12V DC these expect. Used some scrap conduit, wire loom, and some project boxes to bring the whole thing together. Now the light is a lot brighter, and it's not half-blocked by the chute. Big improvement! You can find plenty of howtos and parts lists on youtube to do the same.
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Reviewed in the United States on May 27, 2026
D
Verified Purchase
Dan W
Dallas, US
★★★★★ 3
use care when starting the bolts.
Color: 2Pcs 18W LED Flood Light
Had these for awhile before I got around to installing them or should say attempted to install these. Mounting the bracket was challenging with supplied bolts. The predrilled holes in the mounting block were very poorly threaded. It was almost impossible to get the bolts started without cross threading. The finished product was acceptable. I have other Nilight products and never experienced a single issue.
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Reviewed in the United States on March 7, 2026
M
Verified Purchase
matt
Alexandria, US
★★★★★ 5
Best lights you can get for the best pricing!
Color: 5in Round LED Pod, Color: 5in Round LED Pod
I have had man different off road lights over the years for many different vehicles. Let me tell you about these 5” aux beams. I ordered these lights to go on my 2500 as ditch lights and I am beyond impressed! The lights showed up well packaged. When opening the box, the instructions where right on top and by far one if the easiest sets of instructions I’ve had for wiring diagrams. The lights were packaged and wrapped in foam all the way around to protect them from shipping. The wrapping of the lenses for scratch prevention was perfect. The included wiring harness was packed in a bag and laid out very easily for installation. The harness hooked to the battery and then to the lights with easy quick connects and had more than enough length to put the lights anywhere. Once they were mounted and installed I hooked them up to my aux beams switch panel with ease. Now for the lights! The brightness is beyond bright enough to see miles away! These lights will shine anything you could ever want to see. The spot flood combo work exceptionally well for all situations and darkness. The side shooter stretch them beam out to the sites and can see all the way across. The running lights tie in very easy with your turn signals for extra turn lights or running lights. Heavy duty is an understatement for the quality of these lights. I’m still running them after several months with no water intrusion and still as bright as the day I installed them. The price for what you get, is far beyond better than other top brands! I will be buying more of these for my next off roading set up!
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Reviewed in the United States on September 23, 2025

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