Rafmagnsmyllir Alpha Compact 28/110 VP

The Mastervolt Alpha Compact 28/110 VP alternator is designed to rapidly and efficiently recharge your marine battery bank. It delivers a nominal current of 110 A, making it ideal for demanding marine environments.

No, this alternator is supplied without the Alpha Pro III charge regulator. However, this regulator is essential to ensure optimal voltage management and safe charging of your batteries.

This model is specifically designed for electrical systems operating on a 24V DC network.

The Alpha Compact 28/110 VP alternator is specifically designed to fit perfectly on marine engines from the Volvo Penta brand, thanks to its mounting system on the stern drive arm.

It delivers 110 A at 24 V (approximately 3 kW) and requires a drive power of 6.2 kW (8.3 HP), enabling very fast charging of large-capacity battery banks.

Yes, the Alpha Compact series features a patented magnetic design and dual cooling fans. It can operate safely up to a maximum temperature of 120 °C.

Despite its high performance, this alternator remains very compact and has a contained weight of 7.4 kg.

The generation (or activation) speed for this model is 1400 RPM. At this RPM, it starts producing power to recharge your batteries.

The Alpha Compact 28/110 VP alternator can support a maximum rotational speed of up to 15,000 RPM.

Cooling is provided actively by a dual integrated fan system, ensuring optimal heat dissipation even in confined spaces.

The temperature sensor is built into the alternator. It connects very simply via an RJ12 connector, which links it to the charge regulator for smooth communication with the electrical system.

To ensure safe power transfer compliant with marine standards, the alternator is equipped with two M8-format positive output terminals.

No, this alternator model is not galvanically isolated. This must be taken into account when designing your marine electrical system.

The W signal, used for the tachometer, is easily retrieved via a quick connection using an insulated terminal provided for this purpose on the alternator.

The Alpha Compact 28/110 VP alternator is designed to rotate clockwise (right-hand rotation).

This specific model for Volvo Penta engines uses a gimbal arm type mount (saddle mounting), providing robust and vibration-resistant support suitable for marine conditions.

The connection of the induced current (field current) is made via a dedicated Mastervolt connector, ensuring reliable connection with the regulator.

If an isolated mount is required, you must use insulating bushings (reference kit 48420242) to insert on each side of the mounting holes, and add a terminal lug for the ground cable between one of the bushings and the alternator.

Unusual noise often comes from a mechanical issue related to the belt. It is recommended to:

Check the alignment of the pulleys.Check the belt tension.Inspect the condition of the idler pulley.

It is normal for the charging current to decrease slightly when hot (up to 15% less) to protect internal components. Conversely, when cold, charging can be up to 20% higher than the nominal value.