Alternator Alpha Pro III

The Mastervolt Alpha Pro III is an external alternator regulator (charge regulator) – not an alternator – that controls the charging curve of a connected standard or high-power alternator in 3 stages, enabling fast, complete charging of onboard batteries. As a Mastervolt system partner, Philippi supplies the Alpha Pro III for 12V and 24V onboard electrical systems and, if required, integrates it into your Philippi P-Bus system via the CMB interface.

• One regulator for 12V and 24V onboard electrical systems – no separate variant needed per voltage level
• Protects the battery from overcharging through a 3-stage charging curve with temperature compensation via the included battery temperature sensor
• Compact, separate installation (90 x 109 x 30 mm) independent of the alternator's mounting location, connected via a 1.5 m connection cable
• Charging status visible at all times via the integrated LED display

Function and System Integration

The Mastervolt Alpha Pro III is not a replacement for an alternator, but rather its control electronics: It takes over the control of excitation current and charging voltage and ensures that a standard or high-power alternator with up to 400 A charging current operates efficiently and gently on the battery. This clear distinction is important when ordering – anyone needing a complete alternator should choose a model from the Mastervolt Alpha series (e.g., Alpha 24/150 MB); the Alpha Pro III is installed in addition to an existing or newly acquired alternator.

For yacht owners and camper builders who want to upgrade their onboard electrical system or retrofit an existing alternator with more modern charging technology, the Alpha Pro III is a compact solution: Thanks to separate installation, it can be placed in an easily accessible location, independent of the confined engine compartment. As a Mastervolt system partner, Philippi integrates the Alpha Pro III into a P-Bus system via the CMB interface (Philippi order no. 0 7100 0030) if required, so that charging data also becomes visible on the Philippi system monitors PSL and PSM 3.

Technical Data

Compatibility

• Alternators: for standard and high-power alternators up to 400 A, including the Mastervolt Alpha series.
• Voltage level: one device for 12V and 24V onboard electrical systems, no separate variant selection needed.
• Philippi P-Bus / System Monitor: Integration via the CMB interface (Philippi order no. 0 7100 0030) into P-Bus systems with PSL and PSM 3 monitors.

Frequently Asked Questions

Is the Alpha Pro III an alternator?
No. The Mastervolt Alpha Pro III is an external alternator regulator that controls the charging curve of a separately existing alternator. It does not replace an alternator, but rather its control electronics.

Can I retrofit my existing alternator with the Alpha Pro III?
Yes, provided the alternator is designed for an external regulator and supplies a maximum charging current of 400 A. The Alpha Pro III is connected to the alternator via the 1.5 m connection cable.

Does the Alpha Pro III work for 12 V and 24 V?
Yes, one device covers both voltage levels; a separate 12V or 24V variant is not necessary.

Can the Alpha Pro III be integrated into a Philippi onboard electrical system?
Yes, via the CMB interface, Philippi integrates the Alpha Pro III into P-Bus systems with PSL and PSM 3 monitors.

Who can help with selection and installation?
Philippi is a Mastervolt system partner and will advise you whether you need the Alpha Pro III as a regulator for an existing alternator or a complete alternator from the Alpha series.

Inquire about the Mastervolt Alpha Pro III with Philippi now – we will clarify with you whether a regulator or a complete alternator is the right solution for your onboard electrical system.