Alpha 24/75 III

Delivery includes Alpha Pro III charge regulator.

  • Fast & complete charging of starter and service batteries.
  • Power supply for all consumers.
  • 12 V and 24 V versions.
  • 75 A to 150 A charge current.
  • Standard delivered with Alpha Pro III charge regulator for an optimal performance and longer-lasting batteries.

Using a Battery Mate or battery isolator in conjunction with an Alpha alternator makes it possible to easily charge two or three separate battery sets simultaneously.

TIP: A second alternator on the main engine, combined with a larger battery bank and inverter, could be an alternative for a generator.

For all engine types

Alpha alternators are equipped with several fixations for customised alternator brackets, available from your installer or engine supplier. Some engine brands come with Mastervolt alternator brackets as an option.

Fast charging, even at a stationary rpm

Standard alternators only supply the specified capacity at a high rpm. The Mastervolt Alpha alternator is specifically designed for powerful charging, even with a low engine rpm.

Multigroove pulley

The 12/130 and 24/75 models are also available with a multigroove pulley.

Performs above 40 °C

Forced cooling by fan operation of the pulley provides a lot of power in higher temperatures, especially close to the engine.

Product code: 48624075 This product is no longer available.
Please click here for the current model:
Alpha 24/110 III
download pdf


General specifications
Charge regulation an Alpha Pro III regulator comes standard with all models
Total charge current 75 A
Belt section 2xA
Isolated operation yes
Rotational direction 2
Mounting six o’clock
Dimensions see ‘Downloads’ for drawings
Weight 10.1 kg
22.3 lb
Technical specifications
Charge voltage Absorption 28.5 V
Charge voltage Float 26.5 V
Nominal diameter pulley 89 mm
3.5 inch



Alpha 24/75 III

Charge characteristics for Mastervolt alternators models Alpha 12/90, 12/130, 24/75, 24/95C, 24/110...


Drawings (dimensions)

Dimensions Mastervolt Alternator models 12/130, 24/75 and 24/110 (zipped DWG, PDF and EPS file)


Product notifications

Alpha 24/75 III

Mastervolt alternators & brackets


3D product drawings

Zipped STEP file Alpha Alternator 24-75 excl regulator


Product image

Alpha 24/75 III Small »
Medium »
Large »

Mastervolt_group shot Mass

Product image

Alpha 24/75 III Small »
Medium »
Large »


Neil Cox, Head of the Boatyard, gives you an extensive look inside the electrical system on every boat participating in the Volvo Ocean Race.

Abby Ehler from Team Brunel shares her experience with the Mastervolt Power System in the Volvo Ocean Race, especially when it comes to ease of operation.

Liz Wardley, boat captain of Team Turn the Tide on Plastic, really likes the reliability of the Mastervolt Lithium Ion batteries onboard the VO65.

Simon Fisher, navigator of Vestas 11th Hour Racing, elaborates on the importance of the flawless integration of Mastervolt and B&G.

Watch the interviews and learn more about the excellent Mastervolt performance during the 2017/18 edition of the Volvo Ocean Race.



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