The Mastervolt Mass Battery Charger is the perfect solution for professional, semi-professional, and recreational settings, offering a reliable power supply in the toughest conditions.

The Mastervolt Mass Battery Charger is the top choice for those who need a durable and reliable power supply, no matter the situation. Designed to withstand the toughest conditions, the Mass series is ideal for professional, semi-professional, and recreational purposes. Thanks to its sustainable and proven technologies, these chargers have a long lifespan and can operate 24/7 without any issues.

One of the standout features of the Mastervolt Mass Battery Charger is its GMDSS compatibility. This means that it meets the requirements of the Global Maritime Distress and Safety System, making it perfect for use on boats and other marine vessels. Additionally, these chargers are lightweight and have a stainless steel and anodised aluminium casing, making them resistant to damage from dampness or condensation.

GMDSS Compliance:

Designed to meet the stringent requirements of the Global Maritime Distress and Safety System (GMDSS), ensuring adherence to SOLAS regulations. Enables monitoring of various alarm functions for enhanced safety at sea. Compatible with separate GMDSS remote panels for seamless integration.

Lithium Ion Battery Charging:

Ensures clarity and precision in charging Lithium Ion batteries, a popular choice for marine applications. Direct communication between Mastervolt battery chargers and Lithium Ion batteries via integrated MasterBus technology, or adaptation to required charging voltages, eliminates ambiguity in the charging process.

MasterBus Compatibility:

Simplifies connectivity by enabling easy integration into a MasterBus network with a single cable and connection. Offers flexible monitoring, configuration, and control options—choose between central, local, or remote management of your system.

Robust Design for Durability:

Certified Mass battery chargers are engineered for resilience, capable of withstanding heavy vibrations and shocks encountered in demanding marine environments. Premium quality components ensure adherence to the highest specifications, while intelligent and robust mounting solutions contribute to a professional end result.


  • Designed for tough conditions
  • GMDSS compatible
  • Suitable for all types of batteries
  • Current Control function
  • MasterBus compatible


Description Mass 48/25 Mass 48/50
Code 40040256 40040506
General Specifications
Nominal output voltage 48V
Total charge current 25A at 57V 50A at 57V
Number of battery outlets 1
Recommended battery capacity 100–500Ah
Nominal input voltage 230V (180–250V) – 50/60Hz
Supplies your system without battery yes
Display/read-out LED display
Dimensions, H x W x D mm 420 x 318 x 130 420 x 318 x 130
Weight kg 4.6 7.7
Approvals* CE, ABYC A-31 / RRR, RMRS
Technical Specifications
Temperature sensor yes (included)
Charge Characteristic** IUoUo, automatic / 3-step for gel/AGM/wet/Lithium Ion
DC consumption <1 mA
Full load consumption (230V AC) 1800 W 3500 W
Cos phi >0.95
Temperature range (ambient temp.) -25°C–80°C, >45°C derating
Cooling vario fan
Protection degree IP23
Protections over temperature, over load, short circuit, high/low battery voltage
MasterBus compatible yes
Charger Status Interface (alarm contact) yes
SKU MV4004
Brand Mastervolt

Two Year Manufacturer Warranty

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