Mastervolt Mac Plus 12/12-50: Intelligent DC-DC Charging for Modern Vehicles and Vessels

The Mastervolt 81205105 Mac Plus 12/12-50 + CZone DC-DC Charger is designed to ensure service batteries receive the charge they need—even in systems equipped with smart alternators and start/stop technology. By delivering a stable, controlled charge whenever the engine is running, the Mac Plus solves one of the most common charging challenges in modern mobile and marine power systems.

As part of the trusted Mastervolt lineup, the Mac Plus combines proven charging algorithms, robust construction, and advanced system integration in a compact, fan-less design.

A recommended alternative is Victron Energy Orion XS 12/12-50A DC-DC Battery Charger

Boosting Service Battery Performance

In many installations, service batteries receive incomplete or inconsistent charging due to smart alternators that reduce output once the starter battery is full. The Mac Plus DC-DC charger addresses this by delivering a quick, safe, and consistent charge directly to the service battery.

Key benefits include:

• Reliable charging during short or variable engine run times
• Automatic engine run detection
• Protection against draining the starter battery

This ensures the service battery is charged efficiently without compromising starting power.

Proven 3-Step+ Charging Algorithm

Using Mastervolt’s proven 3-step+ charge algorithm, the Mac Plus delivers optimized charging across a wide range of conditions. Even deeply discharged batteries can be charged safely and efficiently.

Supported battery types include:

• Flooded lead-acid
• GEL
• AGM
• Lithium-Ion, including LiFePO₄

Battery temperature-optimized charging further enhances safety and performance across varying environments.

Silent, Robust Design for Harsh Environments

The Mac Plus features a fan-less, power-efficient design, allowing it to operate silently while minimizing wear and maintenance. A high-quality aluminum housing provides excellent protection against dust and water ingress, making it well-suited for demanding marine and mobile installations.

Its robust construction ensures long-term reliability even under vibration, heat, and challenging operating conditions.

Total Power Flexibility with Smart Alternator Support

With a wide DC input range, the Mac Plus supports virtually all DC sources and can charge two batteries from a single alternator or charger. It operates seamlessly with modern Euro 5 and Euro 6 alternators, maintaining proper charging even when alternator output is reduced or inactive.

Additional flexibility includes:

• Adjustable current limits to meet Euro 5/6 requirements
• Voltage stabilization to protect sensitive electronics and lighting
• Analog voltage sense ports to compensate for voltage drop

Advanced high-frequency technology and modern microprocessors ensure minimal power loss when converting between 12V and 24V systems.

Scalable Power with Parallel Operation

For systems requiring higher charging capacity, the Mac Plus supports parallel operation of up to ten units, delivering charging currents well over 100 amps. This scalability allows the system to grow as power demands increase without redesigning the entire charging architecture.

Superior Monitoring and Control

Built-in compatibility with CZone®, NMEA 2000® and MasterBus enables advanced monitoring, automation, and system integration. The Mac Plus can be configured and managed using:

• MasterAdjust software
• CZone configuration tools
• On-board DIP switches

High-quality MOSFETs and intelligent control logic ensure precise charging behavior and system protection.

Additional Functional Features

The Mac Plus also includes:

• Power supply mode for stable power to sensitive loads
• Engine run detection to safeguard the starter battery
• Temperature compensation for optimal charging results
• Heavy-duty connections for quick installation
• E-Mark / R10 certification for mobile applications

Compact and Installation-Friendly

Despite its advanced capabilities, the Mac Plus maintains a compact and lightweight profile.

Specifications:

• Output: 12V / 12V – 50A
• Weight: 2 lbs
• Dimensions: 9.84 × 6.3 × 2.44 in

This makes it easy to install in tight spaces without sacrificing performance.

Genuine Mastervolt DC-DC Charging Solutions from 12VoltPower.com

12VoltPower.com offers authentic Mastervolt DC-DC chargers and power management solutions, ensuring proper compatibility, system integration, and long-term reliability across marine, mobile, and off-grid applications.