Mastervolt Mass 48/25 230V MB Battery Charger

The Mastervolt Mass 48/25 230V MB battery charger provides a nominal output voltage of 48 V and a total charging current of 25 A.

This charger is compatible with a wide range of battery types, including Gel, AGM, Wet (flooded lead-acid), and Lithium Ion batteries.

Yes, this charger is designed to recharge batteries even if they are fully discharged.

The charger uses a 3-step+ IUoUo automatic charging characteristic to optimize the charging process for each battery type.

Yes, this charger is specifically designed for demanding marine environments. Its housing is made of lightweight stainless steel and anodized aluminum, and its internal components are coated for protection against moisture and condensation.

The charger must be installed in a well-ventilated space. Ambient temperature must be between 0 and 60°C (32 to 140°F). Power derating is applied above 40°C (104°F) to reduce internal heat sink temperature.

Yes, this Mastervolt Mass charger is equipped with MasterBus communication capability, allowing connection to a local data network with other MasterBus devices.

Yes, the Mastervolt Mass 48/25 230V MB battery charger can provide stable, ripple-free power even when no batteries are connected.

The charger is equipped with a stainless steel and anodized aluminum housing, and its internal components are coated for effective protection against moisture and condensation, making it suitable for demanding environments.

Yes, this charger is standard-equipped with a second 3 A charging output. It is intended to maintain the charge of a secondary battery bank, such as a start battery.

Charge voltages are as follows:

Bulk: 57 V
Absorption: 57 V (with a 4-hour duration)
Float: 53 V for wet batteries (flooded lead-acid) and 55.2 V for Gel, AGM, or Lithium-ion batteries.

For installation, the following tools are recommended as a minimum:

A 13 mm socket wrench to secure the DC input cables (battery).A Phillips screwdriver to open the charger’s connection area.A 2 mm flathead screwdriver for the sense terminal.

If the ambient temperature exceeds 40°C (104°F), the charger will apply a power derating. This means it will reduce its output power to lower the internal temperature of the heat sink and protect the components.

Yes, the Mastervolt Mass 48/25 230V MB charger complies with the following standards and certifications: CE, ABYC A-31, RRR, and RMRS.

Yes, if a battery isolator is used and causes a 0.6 V voltage drop, this drop can be compensated. One method is to set DIP switch 4 to "On" (Diode enabled) to activate diode compensation (+0.6 V).

The Mass charger must be installed in a well-ventilated space protected from rain, snow, spray, steam, bilge moisture, and dust.

Yes, the charger is equipped with a dry contact alarm relay (floating potential). The alarm function has two modes: standard (factory setting) and DC alarm mode (continuous mode).

The charger connects to an external power source (e.g., shore power or a generator) via an AC cable. Specific connections are: brown or black wire to L1 (phase), blue wire to N (neutral), and green/yellow wire to PE / GND (ground).

If multiple batteries or battery banks must be charged simultaneously from a single output, a battery isolator must be used. This isolates the different battery banks from each other to prevent one bank from discharging another.

The front panel of the charger is equipped with LEDs that indicate the operating status:

A green LED for normal operation and a red LED for a fault condition. LEDs to indicate the charging stages (BULK, ABSORPTION, FLOAT). LEDs to indicate the percentage of charging current (e.g., 0-5%, 5-25%, etc.). A green LED for MasterBus communication.