Returns are accepted within 30 days after shipment. To be eligible for a return, items must be unused, uninstalled, and in their original packaging, and proof of purchase is required. The following items are not eligible for return: Installed or used products, clearance or final-sale items, trolling motors, programmed AIS units, KVH Starlink products that are registered or opened, special-order products, or products displaying the notice “This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.” in their description. Opened or unsealed DVDs, CDs, or cartography (unless defective) are not eligible for return. Return Merchandise Authorization (RMA) numbers are required for all returns. Learn more.
Shipping Policy
Egret Marine ships marine parts and accessories within the contiguous United States only. Orders are typically processed same day if placed before 3pm CST, excluding weekends and holidays. Learn more.
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.
Features:
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
Specifications:
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: 10-15 V
Nominal Output Voltage: 12 V
Output Voltage Stabilization: 2 % at extremes of temperatures, load, and input
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
Protection Degree: IP23
Protections: Overload, over temperature, DC short circuit, reversed polarity (fuse)
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