The Mastervolt Mac Plus 12/24-30 DC-DC Converter is a compact, intelligent charging solution for marine and mobile setups. It converts 12 V input to a stable 24 V output (up to 30 A) while seamlessly integrating with MasterBus, CZone, and NMEA 2000 for monitoring and automation.
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Input/Output specs: 12 V nominal input with a 10–16 V input range; 20–30 V output range (nominal 24 V); max output current 30 A.
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Charging efficiency: Greater than 95% efficiency at nominal input under full load, with peak efficiency up to 97%.
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3-step+ charging algorithm: Fast, safe charging that reliably replenishes batteries, even from a flat start.
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Engine run detection: Protects the starter battery by charging only when appropriate, preventing engine drain.
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Fanless design: Silent, maintenance-free operation suitable for enclosed or quiet environments.
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Battery chemistry compatibility: Wide support for flooded, Gel, AGM and Li-Ion chemistries (including LiFePO4) for versatile marine and mobile use.
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Euro 5/6 readiness: Adjustable current limits to meet modern emissions standards and charging requirements.
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Voltage stabilization: Keeps sensitive equipment and loads stable during charging.
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Parallel capability: Up to ten units in parallel, delivering well over 100 A for larger systems and faster charging.
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Smart integration: MasterBus, CZone and NMEA 2000 compatibility for monitoring, automation, and seamless system integration.
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Temperature compensation & voltage sense: Optimizes charging across varying temperatures and battery conditions.
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Analog voltage sense ports: Compensate for voltage drop to maintain accurate charging voltages.
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Rugged construction & certification: Aluminum housing with heavy-duty connections, DIP switches for quick setup, and E-Mark/R10 certification for mobile applications.
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Power supply mode: Provides stable, clean power for critical electronics and lighting while charging other batteries.
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Modern alternator compatibility: Engineered to work with modern alternators and hybrid battery chemistries for reliable power on the move.
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Monitoring indicators: Status indicator via a 3-color LED; Battery temperature sensor included; Battery voltage sense; Alarm contact through MasterBus.
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Power and performance specs: Max output power 725 W; Nominal output power 675 W; Max output current 30 A; Output charge current 30 A; Max input current 50 A.
The Mac Plus delivers reliable, intelligent charging that safeguards your starter battery while powering essential systems. Its fast, efficient charging supports diverse chemistries—including LiFePO4—and scales to larger setups through parallel units. With silent operation, rugged construction, and industry-standard integration (MasterBus, CZone, NMEA 2000), you gain seamless monitoring, automation, and dependable performance in harsh marine environments. The built-in engine-run protection and voltage stabilization keep equipment safe and ready, whether cruising or at anchor.
| Specifications battery charger |
| 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 stabilisation |
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, hxwxd |
10.0 x 6.5 x 2.6 inch |
| Weight |
4.4 lb |
| 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 mm, (positive input, positive output, joint negative connection) 8-pole screw connection for cable diameters of 0.75-1.5 mm (remote on/off, temperature sensor, voltage measurement |
| Temperature range (ambient temp.) |
-25 °C to 60 °C; derating > 40 |
| Cooling |
natural cooling |
| Protection degree |
IP23 |
| Protections |
overload, over temperature, DC short circuit, reversed polarity (fuse) |
| MasterBus compatible |
yes |
