Introducing the Mastervolt Mac Plus 12/24-30 DC-DC Converter (12V input, 24V output, 30A) with CZone. Model: 81205305. Fast and safe charging, even during short trips, with a fanless design for silent operation and dependable performance in harsh environments.
Key features
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Fast, safe charging powered by the proven Mastervolt 3-step+ charge algorithm, delivering a quick and easy charge even to completely flat batteries.
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Engine run detection protects the starter battery by ensuring the Mac Plus only charges when appropriate, so you’re never left with a drained engine.
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Fanless operation for quiet, maintenance-free performance.
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Wide battery compatibility suitable for flooded, Gel, AGM and Li-Ion chemistries (incl. LiFePO4) for versatile marine and mobile use.
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Euro 5/6 ready with adjustable current limits to meet modern emissions standards and charging requirements.
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Voltage stabilization protects sensitive equipment, lights and loads from fluctuations during charging.
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Parallel capability up to ten units, delivering well over 100 Amps for larger systems and faster overall charging.
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Smart integration MasterBus, CZone and NMEA 2000 compatible for intelligent monitoring, automation, and seamless system integration.
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Temperature compensation & voltage sense for optimal charging results across varying conditions and battery temperatures.
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Analog voltage sense ports to compensate for voltage drop and maintain accurate charging voltages.
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Certification & flexibility E-Mark/R10 certification for mobile applications, and a wide DC input range that supports charging two batteries from a single source.
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Stable power for sensitive loads Power supply mode ensures consistent, clean power for critical electronics and lighting.
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Rugged, installer-friendly design heavy-duty connections and quick setup via onboard DIP switches, with a robust aluminium housing protecting against dust and water ingress.
Why compromise on your service battery charge when you can rely on a system built for reliability, efficiency, and intelligent control? The Mac Plus DC-DC charger delivers fast, safe, and consistent charging while safeguarding your starter battery and coordinating with your onboard controllers. Engineered to work with modern alternators and hybrid battery chemistries, it’s the trusted choice for quiet, capable power on the move.
| 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 |
