The ChargeMaster Plus 24/20-3 is a compact, high-performance 20 A 24 V battery charger built 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.
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Output and current: 24 V nominal output with up to 20 A on the primary output
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Three battery outlets with automatic current distribution: All three outputs can deliver maximum current when needed, with intelligent distribution based on each battery’s condition to maximize charging speed and efficiency
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Three-step+ charging for all chemistries: Fast and safe charging that covers Gel, AGM, flooded, and Lithium Ion batteries; includes a Lithium Ion profile and options for user-defined charging schedules
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Pre-float protection: Prevents overcharging of smaller batteries, helping to safeguard longevity and performance
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Standalone or system-integrated operation: Use as a plug-and-play charger or fully integrated within a MasterBus or CZone system for centralized power management
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Advanced communications: Direct communication with Mastervolt Lithium Ion batteries, MasterShunt, or a system display for real-time adjustments and optimal performance
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Native network compatibility: Built-in MasterBus, CZone, and NMEA2000 interfaces for seamless integration into your vessel’s smart electrical ecosystem
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Rugged marine design: Engineered to withstand high temperatures and voltage fluctuations typical of harsh maritime and mobile environments
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Global compatibility and efficiency: Designed for worldwide mains voltages and frequencies; power factor better than 0.98; automatic DC voltage compensation for stable charging performance
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Key specifications: 24 V nominal output, up to 20 A on the primary, 3 outlets (80–200 Ah bank size), 120/230 V input (50/60 Hz), LED display, compact form factor (11.5 x 8.3 x 4.1 in), and 5.5 lb
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Certifications: CE, CEC, DOE, ABYC, UL1236, cULus, SAE J1171, ISO 8846, ACMA
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Temperature compensation: Temperature compensation for charging accuracy with an included temperature sensor
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Quiet operation: Improved cooling delivers very low noise across the entire power range
Whether you’re upgrading a single‑battery setup or building a centralized charging network on a larger vessel, ChargeMaster Plus 24/20-3 delivers rapid, safe charging with intelligent distribution and seamless integration into your MasterVolt ecosystem. Its compact footprint and lightweight design simplify installation, while worldwide voltage compatibility and support for multiple chemistries—including Lithium Ion—provide a flexible, future‑proof solution that protects battery longevity and optimizes onboard power management.
| General 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 (230 V / 120 V) |
2,8 A / 5,6 A |
| 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 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) |
