Mastervolt Mac Plus 12/12-50 + Czone is a premium DC-DC charger designed to keep your service battery charged fast and safely—even on short trips. With a 12 V input and 50 A output, it delivers reliable power for modern electrical systems while protecting your starter battery from depletion.
Engine run detection ensures charging happens only when the engine is running, so you won’t unintentionally drain the starter battery. The fanless design provides silent operation, making it ideal for boats, caravans, and workshops where quiet performance matters. This unit supports flooded, Gel, AGM and Li-Ion chemistries, including LiFePO4, and can charge two batteries from a single alternator or charger.
Equipped with a proven Mastervolt 3-step+ charge algorithm, the Mac Plus delivers a quick and easy charge even to completely flat batteries. A wide DC input range, temperature compensation, and voltage sense optimization ensure reliable charging across diverse conditions and battery types. Voltage stabilization protects sensitive equipment, lights, and loads from fluctuating power.
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Parallel operation to obtain charging capacities well over 100 A (up to ten units).
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Euro 5/6 compatible with adjustable current limits to meet emissions-era requirements.
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Power supply mode provides a stable, clean power source for sensitive loads.
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MasterBus, CZone and NMEA 2000 compatibility for intelligent system monitoring and automation.
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Analog voltage sense ports compensate for voltage drop and maintain optimal charging.
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Temp. compensation and voltage sense for an optimal charging result.
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E-Mark/R10 certification for mobile applications.
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Heavy-duty connections and quick setup via DIP switches, MasterAdjust, or CZone configuration tools.
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Aluminium housing provides superior protection against dust and water ingress and rugged reliability in harsh conditions.
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Wide input range and capability to charge two batteries from a single alternator.
In short, the Mastervolt Mac Plus 12/12-50 + Czone is the complete on-board charging solution—robust, versatile, and designed to keep your batteries at peak performance, no matter the journey. Upgrade your charging system with a proven, silent, high-efficiency DC-DC charger that integrates seamlessly with modern marine and mobile electrical networks.
| 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 |
725 W |
| Nominal output power |
675 W |
| Max. output current |
50 A |
| Output charge current (3-step mode) |
50 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 |
