Meet the Mastervolt Mac Plus 24/12-50 DC-DC Converter with CZone — the smart, compact charging powerhouse that protects your starter battery while delivering fast, safe charging to your service battery. With a 24V input and 12V output at up to 50A, it’s built to keep your electrical system performing at its best, even on short trips.
Why choose the Mac Plus 24/12-50
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Fast and safe charging for service batteries, ensuring reliable power when you need it most, without compromising starter battery health.
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Fanless design for silent operation, so your cabin stays quiet while charging.
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Broad battery compatibility for flooded, Gel, AGM, and Li-Ion chemistries (including LiFePO4) — from traditional packs to modern lithium setups.
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Engine run detection protects the starter battery by charging only when the engine is running.
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Adjustable current limits to meet Euro 5/6 requirements and tailor charging to your installation.
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Voltage stabilization safeguards sensitive equipment, lights, and loads from dips and spikes.
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Parallel operation supports configurations of up to ten units, delivering well over 100A for larger systems.
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Intelligent monitoring and automation with MasterBus, CZone, and NMEA 2000 compatibility for seamless system integration.
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Temperature compensation and voltage sense ensure optimal charging across conditions and wiring losses.
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Certification and mobile suitability with E-Mark/R10 approval for mobile applications.
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Power supply mode provides stable power for sensitive loads when engine charging isn’t available.
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Rugged build with high-quality aluminum housing and heavy-duty connections for quick, reliable installation via simple DIP switches.
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Proven 3-step+ charging algorithm delivers a quick, easy charge even to deeply discharged batteries.
Smart, safe, and ready for modern systems
The Mac Plus addresses a common problem: service batteries that don’t receive the charge they deserve due to smart alternators or start/stop systems. By recognizing engine status and providing steady, controlled charging, it prevents starter-battery drain while delivering robust energy to your auxiliary bank. Its wide DC input range enables charging from multiple sources, including dual battery banks from a single alternator or charger, and it is compatible with a broad spectrum of chemistries — including lithium and LiFePO4 — while maintaining compatibility with Euro 5/6 smart systems.
Designed for reliability in harsh conditions
With battery-temperature optimized charging and a rugged aluminum enclosure, the Mac Plus is built to withstand dust, water ingress, and extreme environments. Its power-efficient, fanless operation means you can enjoy quiet performance on board. And thanks to advanced MOSFETs and high-frequency switching, it delivers minimal power loss when converting between 12V and 24V for efficient energy management.
Compatibility and integration
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MasterBus, CZone, and NMEA 2000 compatible for superior monitoring, control, and automation within complete systems.
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Supports two batteries from a single alternator or charger, maximizing charging opportunities from modern power sources.
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Analog voltage sense ports to compensate voltage drop and maintain proper charging across cables.
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Temperature sensor included for precise battery management right out of the box.
Choose the Mastervolt Mac Plus 24/12-50 DC-DC Converter to deliver fast, safe, and intelligent charging across diverse battery chemistries, while protecting your starter battery and integrating effortlessly with modern boat or vehicle electrical systems.
| 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 |
10-15 V |
| Nominal output voltage |
12 v |
| Output voltage stabilisation |
2 % at extremes of temperatures, load and input |
| Output voltage ripple (peak peak) |
max. 1 % |
| Max. output power |
750 W |
| Nominal output power |
710 W |
| Max. output current |
50 A |
| Output charge current (3-step mode) |
50 A |
| Nominal input voltage |
24 V |
| Input voltage range |
19-30 V |
| Max. input current |
30 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 |
