Meet the Mastervolt ChargeMaster Plus 12/50-3 Battery Charger (Model 44310505): a compact, high‑performing charging solution built for demanding marine and mobile power systems. It can operate as a standalone unit or join a MasterBus, CZone, or NMEA2000 network to deliver automatic power distribution and peak charging on every output.
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Three‑output design: 3 battery outlets with up to 50 A total across all outputs for fast, safe charging of two or three batteries.
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Automatic current distribution: Intelligent allocation of charging current based on battery condition for optimal performance.
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Pre‑float protection: Prevents overcharging smaller batteries when bank sizes vary.
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3‑step+ charging for multiple chemistries: 3‑step+ charging method compatible with Gel, AGM, flooded, Lithium Ion, and a user‑defined profile option.
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Global compatibility and flexible input: Nominal input voltage 120/230 V (80–275 V), 50/60 Hz for worldwide use.
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Battery bank compatibility: Supports 200–400 Ah banks; 12 V nominal output on outputs 1 & 2 with a total 50 A charging capacity.
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Network integration: Interfaces with MasterBus, CZone, and NMEA2000 for automatic power distribution and real‑time adjustments with compatible MasterVolt batteries and MasterShunt.
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Display and safety: LED display with galvanic isolation for clear monitoring and safe operation; compliance to CE, CEC, DOE, ABYC, UL1236, cULus, SAE J1171, ISO 8846, ACMA.
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Efficiency and electrical performance: Power factor > 0.98; Max AC input current 3.5 A at 230 V / 7.1 A at 120 V.
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Durability and cooling: Compact, rugged enclosure with an advanced cooling system to maintain peak performance across the full power range.
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Physical specs: Dimensions 11.5 x 8.3 x 4.1 in; Weight 5.5 lb.
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DC voltage and temperature compensation: DC voltage compensation via automatic compensation or MasterShunt; Temperature compensation at -30 mV/°C / -17 mV/°F with a temperature sensor included.
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Power supply mode: Designed to operate in power supply mode with galvanic isolation for safe, reliable charging.
The ChargeMaster Plus streamlines complex power systems by delivering coordinated charging across multiple batteries, reducing installation time and costs. It’s flexible enough to function as a plug‑and‑play standalone charger or a tightly integrated component of a MasterBus/CZone network, adapting to different chemistries and bank sizes to keep marine and mobile power ready when you need it.
| General specifications |
| Nominal output voltage (output 1 & 2) |
12 V |
| Max. output current primary output |
50 A |
| Total charge current |
50 A at 14,25 V |
| Max. AC current (230 V / 120 V) |
3,5 A / 7,1 A |
| Number of battery outlets |
3 (max.) |
| Battery bank size |
200-400 Ah |
| Nominal input voltage |
120/230 V (80-275 V) 50/60 Hz |
| Power supply mode |
Yes |
| Galvanic isolation |
Yes |
| Display/read-out |
LED display |
| Dimensions, hxwxd |
11.5 x 8.3 x 4.1 inch |
| Weight |
5.5 lb |
| Compliance |
CE, CEC, DOE, ABYC, UL1236, cULus, SAE J1171, ISO 8846, ACMA |
| Communication interfaces |
MasterBus, CZone, NMEA2000 |
| Technical specifications |
| Charge characteristic |
IUoUo, automatic / 3-step+ for Gel/AGM/flooded/Lithium Ion + user defined option |
| Temperature compensation |
-30 mV/°C / -17 mV/°F; temperature sensor included |
| DC voltage compensation |
Yes, via automatic compensation or MasterShunt |
| Power consumption (DC side) |
yes, through MasterBus or Czone |
| Current Control function |
yes, through MasterBus |
| Power factor control |
> 0.98 |
| Temperature range (ambient temp.) |
-25 °C to 80 °C, derating < 0 °C and > 40 °C |
| Cooling |
vario fan |
| Protection degree |
IP23, vertical mounting |
| Protections |
over-temperature, overload, short circuit, high/low battery voltageover-temperature, overload, short circuit, high/low battery voltage, ignition protection |
| MasterBus compatible |
yes |
| Charger Status Interface (alarm contact) |
yes, using a Multipurpose Contact Output (code 77030500) |
