Introducing the Mastervolt ChargeMaster Plus 12/50-3 Battery Charger (Model 44310505) — a powerful, compact power solution engineered for demanding marine and mobile power systems. This 50 A, 12 V output charger can operate as a standalone unit or as part of a complete MasterBus or CZone network, delivering automatic power distribution and peak charging on every output.

• Three outputs with maximum current capability: Up to 50 A total across three battery outlets, so you can charge two or three batteries quickly and safely.
• Pre-float protection: Eliminates the risk of overcharging smaller batteries when bank sizes vary.
• Automatic current distribution: The charger intelligently allocates charging current based on battery condition for optimal performance.
• Versatile chemistry support: The Battery's Best Friend architecture charges any battery chemistry using the fast and safe 3-step+ charging method, including a Lithium Ion charging profile and user-defined profiles.
• World-wide compatibility: Handles all mains voltages and frequencies (120/230 V, 80–275 V, 50/60 Hz) for global use.
• Compact, rugged design: Smaller and lighter than previous models, built to withstand high temperatures and voltage fluctuations in harsh maritime or mobile environments.
• Seamless system integration: Communicates directly with Mastervolt Lithium Ion batteries, MasterShunt, or system displays for real-time adjustments; supports MasterBus, CZone, and NMEA2000.
• Certified and safe: CE, ABYC, UL, cULus, SAE, CEC/DOE, ISO and ACMA certifications.

The ChargeMaster Plus simplifies systems, reduces installation costs, and delivers reliable charging in all conditions. It can be used as a plug-and-play standalone charger or integrated into a complete MasterBus/CZone installation, offering flexible configurations for 200–400 Ah battery banks. Its robust design and advanced cooling keep noise low and performance high across the entire power range.

Technical specifications

• Nominal output voltage (outputs 1 & 2): 12 V
• Max. output current (primary): 50 A
• Total charge current: 50 A at 14.25 V
• Max AC input current: 3.5 A (230 V) / 7.1 A (120 V)
• 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
• Dimensions (H x W x D): 11.5 × 8.3 × 4.1 in
• Weight: 5.5 lb
• Compliance: CE, CEC, DOE, ABYC, UL1236, cULus, SAE J1171, ISO 8846, ACMA
• Communication interfaces: MasterBus, CZone, NMEA2000
• Charge characteristic: IUoUo, au