Mastervolt Mac Plus 12/24-30 + CZone [81205305]

Mastervolt Mac Plus 12/24-30 + CZone [81205305]

Mac Plus 12/24-30 + CZone

Boost the Service Battery

Too often, service batteries don’t get the charge they need. This is a problem made worse by smart alternators and start/stop systems, which result in slow and insufficient charges. The Mac Plus DC-DC charger solves this problem, providing a quick, safe, and consistent charge to the service battery. And, by knowing when the engine is running and providing charge, users can be sure that the Mac Plus will never drain a starter battery.

Proven Mastervolt Quality

Users get peace of mind knowing that they have the best on board. Using the proven Mastervolt 3-step+ charge algorithm, the Mac Plus delivers a quick and easy charge, even for completely flat batteries.

A robust design holds up in even the harshest conditions, with battery temperature-optimized charging and a high-quality aluminum housing to ensure superior protection against dust and water ingress. The power-efficient design also allows the Mac Plus to operate silently and without a fan.

Total Power Flexibility

With a wide DC input range, the Mac Plus allows for all DC sources and can charge two batteries from a single alternator or charger. It supports a full range of chemistries and battery types, including lithium. It also functions seamlessly with modern alternators such as Euro 5 and 6, ensuring proper charging by providing constant power, even when the alternator is inactive.

Parallel configuration of up to ten units will provide over 100 amperes. Advanced high-frequency technology with modern microprocessors ensures minimal power loss when switching from 12V to 24V and vice versa.

Analog voltage sense ports are also available to compensate for voltage drops and maintain proper charging.

Superior Monitoring & Control

Compatibility with CZone®, NMEA 2000®, and MasterBus delivers truly superior monitoring and control and ensures Mac Plus integrates easily into complete systems. Achieve the best performance possible via various controllers and high-quality MOSFETs. And configure the Mac Plus with ease via MasterAdjust, the CZone configuration tool, or even via the on-board DIP switches.


  • Fast and safe charging, even during short trips
  • Fanless design for silent operation
  • Suitable for flooded, Gel, AGM, and Li-Ion batteries (incl. LiFePO4)
  • Even charges fully depleted batteries
  • Engine run detection protects the starter battery
  • Adjustable current limits to meet Euro 5/6 requirements
  • Voltage stabilization protects sensitive equipment, lights, and loads
  • Parallel operation to obtain charging capacities well over 100 Amps
  • MasterBus, CZone, and NMEA 2000 are compatible for intelligent system monitoring and automation
  • Temperature compensation and voltage sense for an optimal charging result
  • E-Mark/R10 certification for mobile applications
  • Power supply mode offers stable power for sensitive loads
  • Heavy-duty connections for easy installation and quick setup via DIP switches


  • Battery Temperature Sensor: Yes, included
  • Battery Voltage Sense: Yes
  •  General Specifications:
  • Status Indicator: Yes, 3-color LED
  • Communication Protocol: MasterBus, CZone & NMEA 2000
  • Output Voltage: 20-30 V
  • Nominal Output Voltage: 24 V
  • Output Voltage Stabilization: 2 % at extremes of temperatures, load, and input
  • Output Voltage Ripple (peak-peak): Max. 1 %
  • Max. Output Power: 725 W
  • Nominal Output Power: 675 W
  • Max. Output Current: 30 A
  • Output Charge Current (3-step mode): 30 A
  • Nominal Input Voltage: 12 V
  • 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 Switches: Yes, for basic setup
  • Dimensions, H x W x D: 255 x 165 x 66 mm (10.0 x 6.5 x 2.6 inch)
  • Weight: 2 kg (4.4 lb)
  • Compliance: CE, E-Mark, SAE J1171 & ISO 8846 Ignition Protected

 Technical Specifications:

  • No-load Consumption: < 2 mA
  • Charge Characteristic: 3-traps+
  • Battery Types: Flooded, Gel, AGM, spiral, Lithium Ion, traction, user-defined
  • 3-Step Charge Option: Yes (DIP switch settings)
  • DC 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 degrees C to 60 degrees C; derating > 40
  • Cooling: Natural cooling
  • Protections: Overload, over temperature, DC short circuit, reversed polarity (fuse)
  • MasterBus Compatible: Yes


  • Charger Input - Voltage: 12v
  • Charger Output - Amps: 30a
  • Charger Output Voltage: 20-30v
  • Box Dimensions: 4"H x 9"W x 15"L WT: 5.55 lbs
  • UPC: 816882023507

Owner's Manual (pdf)



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