Engineered for ultimate versatility, the Mastervolt ChargeMaster Plus 24/20-3 is a compact, high-performance 20 A 24 V battery charger designed for marine, mobile, and harsh-duty environments. With 120/230 V input and native MasterBus, CZone, and NMEA2000 compatibility, it integrates seamlessly into your vessel’s electrical system and smart management network. A new generation with improved cooling delivers very low noise across the entire power range, while offering a smaller, lighter footprint than previous models.

• Three outputs with automatic current distribution: All three outputs can deliver maximum current when needed, with intelligent distribution based on the condition of each battery to maximize charging speed and efficiency.
• Pre-float protection: Pre-float functionality prevents overcharging of smaller batteries, safeguarding longevity and performance.
• Versatile charging architecture: The ChargeMaster Plus charges any battery chemistry using the fast and safe 3-step+ charging method, with included Lithium Ion profile and support for a customised, user-defined profile.
• Battery’s Best Friend: The architecture enables rapid, safe charging of two or three batteries, with compatibility across worldwide mains voltages and frequencies.
• Standalone or system-integrated: Use as a plug-and-play standalone charger or fully functional within a MasterBus or CZone system for centralized power management.
• Advanced communications: Direct communication with Mastervolt Lithium Ion batteries, MasterShunt, or a system display for real-time adjustments and optimal performance.
• Rugged and reliable: Built to withstand high temperatures and voltage fluctuations, making it ideal for harsh maritime and mobile environments. Certified to CE, ABYC, UL, cULus, SAE, ISO, ACMA and more.
• Global compatibility: Designed to handle worldwide frequencies and mains voltages, ensuring reliable charging anywhere in the world.

Technical specifications

• Nominal output voltage (output 1 & 2): 24 V
• Max. output current (primary output): 20 A
• Total charge current: 20 A @ 28.5 V
• Max AC current: 2.8 A (230 V) / 5.6 A (120 V)
• Number of battery outlets: 3 (max)
• Battery bank size: 80–200 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 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, automatic