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Mastervolt Mass battery charger 48/25
Cat. No. MV-40040256
Weight 10.14 lbs

Install Mastervolt Mass battery chargers and rest assured that your batteries are always quickly and completely charged, whether you are at home, on the road or at sea with low shore power or limited supply.

Designed for larger, more professional systems with larger battery capacities, the basic technology consists of high-frequency electronics with no heavy or noisy transformers. Thanks to the intelligent cooling concept, the Mass battery charger offers maximum performance, even in the hottest engine room. Besides the fast and complete charging of two batteries (recommended) this charger also functions as a supply unit when the input is low, automatically making up the full capacity in the 48 V circuit. Mastervoltís 3-step+ charging method guarantees optimum efficiency, meaning your batteries will perform better and last much longer. Its direct current outlet is so clean that the battery charger itself can be used as direct power source, even without a battery.

The high-frequency switch mode technology, in which advanced microprocessors combine a myriad of functions, causes an extremely accurate charge characteristic. Furthermore, this Mass battery charger has an unique memory function which prevents the charger starting a new 3-step+ charge cycle if the supply voltage is interrupted. The model is equipped with an LED status indicator displaying the stage of the 3-step charge cycle while several remote panels are available as option for even more convenience.

All in all it gives you the power to be independent


 General specifications  
  Nominal output voltage

48 V

  Total charge current

25 A

  Number of battery outlets


  Battery capacity range

100-500 Ah

  Nominal input voltage

230 V (50/60 Hz)

  Supplies your system without battery



LED display

  Dimensions, hxwxd

16,54 x 12,52 x 5,12 inches


10,14 pounds


CE, E-mark, ABYC A-31, RRR, RS

 Technical specifications  
  Charge characteristic

IUoUo, automatic 3-step+ for gel/AGM/wet/Lithium Ion

  Charge voltage Bulk

57 V

  Charge voltage Absorption

57 V

  Absorption time

4 hours

  Charge voltage Float (wet batteries)

53 V

  Charge voltage Float (gel/AGM batteries)

55.2 V

  Temperature compensation

-184 mV/ °F

  Voltage compensation

voltage drop compensation in DC cables up to 3 V

  Power consumption (DC side)

< 1 mA

  Full load consumption (230 V AC)

1800 W

  Power factor control

> 0.95

  Temperature range (ambient temp.)

-13 to 176 °F


vario fan

  Sound level

< 48 dBA at 1 mtr

  Protection degree



over temperature, over load, short circuit, high battery, low battery

  MasterBus compatible


  CSI/DC alarm

integrated in the battery charger as standard

  GMDSS function

GMDSS panel is available for all models

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