Only 1 in stock
SVB price: 504,16 €
You save: 12%
575,00 €
Excl. VAT, excl. shipping costs.
This is a NET-price excluding German VAT. Shipments to countries outside of the EU may be subject to import duties and taxes.
504,16 € This is a NET-price excluding German VAT. Shipments to countries outside of the EU may be subject to import duties and taxes.
Available variants:
Item no.
Model no.
10 - 16 V
12 V
50 A

Product details

Charging service batteries on board of a vehicle or vessel can be challenging. Recharging tends to take a long time and batteries may not receive a full charge. This is a common problem found in boats and caravans.

The robust MASTERVOLT DC-DC charger guarantees optimal condition of your service battery at all times.

Traditionally, a service battery is linked to the starter battery by means of a charge relay. The starter battery is located close to the alternator and receives most of the charge current. However, the service battery is usually further away. Long cables cause voltage drops, leading to slow charging, resulting in failing appliances and premature failure of the battery.

Modern, fuel efficient engines are equipped with smart alternators, following regulations such as Euro 5 and Euro 6. Instead of a constant output, smart alternators provide a variable voltage; after a brief charging period, voltage is reduced and the charging stops. Furthermore, the energy produced by regenerative braking leads to voltage peaks. Service batteries coupled in the traditional way will receive hardly any charge and may be damaged by these peak voltages.

To solve these issues, Mastervolt introduces the Mac Plus DC-DC chargers, available in 12 V or 24 V. The Mac Plus monitors the service battery and compensates the voltage loss. The proven 3-step charge method ensures a quick and safe charge. Moreover, by stabilizing the charge voltage, Mac Plus protects your service battery and sensitive equipment.

The Mac Plus is your battery’s best friend. It monitors your service battery and makes sure it’s always fully charged, maximising the lifetime of your battery.

  • Fast and safe charging during short trips.
  • Fanless design for silent operation.
  • Suitable for flooded, Gel, AGM and Li-Ion batteries (incl. LiFePO4).
  • Charges even fully depleted batteries.
  • Engine run detection protects starter battery.
  • Adjustable current limits to meet Euro 5/6 requirements.
  • Voltage stabilisation protects sensitive equipment, lights and loads.
  • Parallel operation to obtain charging capacities well over 100 Amps.
  • MasterBus for intelligent system monitoring and automation.
  • Temperature compensation and voltage sense for an optimal charging result.
  • E-mark certification for mobile applications.
  • Power supply mode.
  • Heavy duty connections for easy installation and quick set up via DIP switches.

Boost charge voltage when service battery is located further from charging source or in systems with a smart alternator. When a stable power supply or different system voltage is needed.

Correct charging with intelligent alternators
The Mac Plus provides constant power to the service battery, even when the alternator is inactive.

Programmable via desktop or laptop or PC
Remote control the Mac via your laptop or PC or configure your personal preferences. The device has a communication port and easy installation with a PC-Link and MasterAdjust software.

Parallel operation
The parallel configuration of several units will provide you with over 100 amperes. Advanced high-frequency technology with modern microprocessors ensures minimum power loss when switching from 24 to 12 V and vice versa.

Item number 65597
Name MAC PLUS 12 / 12-50
Specifications Battery charger
Battery temperature sensor yes, included
Battery voltage sense yes
General specifications
Status indicator yes, 3-color LED
Output voltage 10-15 V
Nominal output voltage 12V
Output voltage stabilization 2% at extreme temperatures, load and input
Ripple output voltage (peak peak) max. 1 %
Max. output power 725 W
Nominal output power 675 W
Max. output current 50 A
Output charge current (3-step mode) 50 A
Nominal input voltage 12V
Input voltage range 10-16 v
Max. input current 50 A
Galvanic isolation no
Voltage limited yes
Efficiency 95% (at nom. input voltage, full load); peak 97%
Parallel configuration yes
Alarm contact yes, through MasterBus
MasterBus powering no
Engine run signal input yes (active high/active low)
Dip switch yes, for basic setup
Dimensions, HxWxD 255 x 165 x 66 mm
10.0 x 6.5 x 2.6 inches
Weight 2 kg
4.4 lb.
Approvals CE, E-mark
Technical specifications
No-load consumption <2 mA
Charge characteristic 3-step+
Battery types flooded, gel, AGM, spiral, Lithium Ion, traction, user defined
3-step charge option yes (DIP switch settings)
DC power consumption <5 mA
Connections 3 x M8 terminal for cable diameters of 10-50 mm², (positive input, positive output, joint negative connection) 8-pole screw connection for cable diameters of 0.75-1.5 mm² (remote on/off, temperature sensor, voltage measurement)
Temperature range (ambient temp.) -25°C to 60°C; derating > 40°C
-13°F to 140°F
Protection degree IP23
Protections DC short circuit, overload, over temperature, high/low battery voltage, reversed polarity (fuse)
Cooling natural cooling
MasterBus compatibility yes


en-flag Certificate
PDF, 914,32 KB
Item no.: 65597,65598,65599,65600
en-flag Manual
PDF, 2,49 MB
multi-flag Certificate
PDF, 72,32 KB
multi-flag Drawing
PDF, 182,25 KB

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