Meet the Mastervolt Mac Plus 24/12-50 DC-DC Converter with CZone — a compact, intelligent charging solution designed to protect your starter battery while delivering fast, safe charging to your service battery.
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Input/Output and power: 24 V nominal input; 12 V nominal output; up to 50 A max output; 710 W nominal / 750 W max; output 10–15 V; input 19–30 V.
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Efficiency: >95% (peak 97%) at nominal input voltage and full load.
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Battery chemistries supported: Broad compatibility with flooded, Gel, AGM, and Li-Ion chemistries (including LiFePO4).
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Engine run detection: Senses engine status to charge only when the engine is running, protecting the starter battery.
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Charging algorithm: Proven 3-step+ charging algorithm for a quick, reliable charge even from deeply discharged batteries.
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System integration: MasterBus, CZone, and NMEA 2000 compatible for monitoring and automation; parallel operation up to 10 units delivering well over 100 A.
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Protection and sensing: Battery temperature sensor included; temperature compensation and voltage sense optimize charging across conditions and wiring losses.
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Durability and install: Rugged aluminum housing with high-quality connections; fanless design for quiet operation; easy DIP-switch configuration for quick installation.
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Certifications: 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.
The Mac Plus addresses a common boating challenge: service batteries not receiving adequate charge due to smart alternators or stop/start systems. By recognizing engine status and delivering steady, controlled charging, it prevents starter-battery drain while delivering reliable energy to your auxiliary bank. Its wide input range and broad chemistry support let you mix traditional and modern packs without overhauling your electrical setup. A quiet, rugged build and seamless integration with MasterBus, CZone, and NMEA 2000 give you real-time monitoring and automation across your system, while features like temperature-compensated charging and voltage stabilization protect your gear and ensure consistent performance in varying conditions.
| 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 |
