Mastervolt ChargeMaster Plus 35A 12V Battery Charger with 120/230V Input, designed for marine and mobile power systems. This compact, high-performance charger powers two or three battery banks quickly and safely, whether used as a standalone device or as part of a full MasterBus/CZone network. Enhanced cooling keeps noise low across the entire power range, while robust construction thrives in harsh environments.
Built to simplify your setup, the ChargeMaster Plus delivers automatic power distribution and intelligent charging that adapts to battery condition. With three outputs that can share the full charging current, it maximizes performance for all connected batteries while protecting them with smart pre-float functionality that prevents overcharging. Its universal compatibility means it works with worldwide mains voltages and frequencies, making it ideal for global adventures or commercial deployments.
Key Benefits
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Standalone or integrated: Use as a single charger or drop it into a MasterBus/CZone system for seamless automation and real-time monitoring.
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Automatic current distribution: Charging current is allocated based on battery condition to maximize charging on every bank.
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Three outputs, one total current: Up to 35 A total across three battery outlets with automatic distribution to optimize performance.
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Pre-float protection: Eliminates the risk of overcharging smaller batteries while keeping larger banks fully topped up.
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3-step+ charging for any chemistry: Fast, safe charging for virtually any battery type, including a dedicated Lithium Ion profile.
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Lithium Ion ready: Includes Li-ion charging profile and compatibility with Mastervolt Li-ion batteries, MasterShunt, or system display for real-time adjustments.
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Global compatibility: Accepts 120/230 V mains with 50/60 Hz, covering virtually every region.
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Compact, lightweight design: Smaller and lighter than previous models for easy installation on boats or mobile rigs.
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Rugged and reliable: Designed to withstand high temperatures and voltage fluctuations in maritime and mobile environments.
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Certified and safe: CE, ABYC, UL, cULus, SAE, CEC/DOE, ISO, ACMA compliant for peace of mind.
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Easy integration: Communicates with MasterBus, CZone, and NMEA2000 networks for coordinated system control and display.
Technical Specifications
- Nominal output voltage (output 1 & 2): 12 V
- Max. output current (primary output): 35 A
- Total charge current: 35 A at 14.25 V
- Max. AC current: 2.5 A (230 V) / 5.0 A (120 V)
- Number of battery outlets: 3
- Battery bank size: 140-350 Ah
- Nominal input voltage: 120/230 V (80-275 V) 50/60 Hz
- Power supply mode: Yes
- Galvanic isolation: Yes
- 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, au
| General specifications |
| Nominal output voltage (output 1 & 2) |
12 V |
| Max. output current primary output |
35 A |
| Total charge current |
35 A at 14,25 V |
| Max. AC current (230 V / 120 V) |
2.5 A / 5.0 A |
| Number of battery outlets |
3 (max.) |
| Battery bank size |
140-350 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) |
