Alpha Compact 28/110 VP Alternator

The Mastervolt Alpha Compact 28/110 VP alternator is designed to quickly 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 battery charging.

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 propeller shaft housing.

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 high-capacity battery banks.

Yes, the Alpha Compact series features a patented magnetic design and dual cooling fans. It can thus 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. From this RPM, it starts producing power to recharge your batteries.

The Alpha Compact 28/110 VP alternator can support a maximum rotation speed of up to 15000 RPM.

Cooling is provided by an active dual-fan system integrated into the device, ensuring optimal heat dissipation even in confined spaces.

The temperature sensor is built into the alternator. It connects via an RJ12 connector, linking it directly to the charge regulator for seamless communication with the electrical system.

To ensure secure 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 accounted for when designing your marine electrical system.

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

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

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

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

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

Abnormal noise often stems from a mechanical issue related to the belt. It is recommended to:

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

It is perfectly 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.