Mastervolt Mass 24/25-2 230 V DNV GL battery charger

The Mastervolt Mass 24/25-2 230V (DNV GL) battery charger provides a nominal output voltage of 24 V DC.

This Mastervolt Mass charger delivers a total charging current of 25 A. It has two battery outputs, including a secondary 3 A output for maintaining a starter battery.

The Mastervolt Mass 24/25-2 charger is compatible with Gel, AGM, and lead-acid batteries. It uses an automatic 3-stage+ IUoUo charging characteristic to optimize battery lifespan.

Yes, the Mastervolt Mass 24/25-2 230V (DNV GL) charger is designed for professional and demanding marine environments. It is certified DNV GL, in addition to CE, ABYC A-31, RRR, and RMRS certifications, attesting to its robustness and reliability.

This charger accepts a nominal input voltage of 230 V AC, with an operating range from 207 V to 264.5 V, at a frequency of 50/60 Hz.

Yes, the charger is supplied with a temperature sensor and its 6-metre cable. The sensor compensates charging voltage based on temperature, optimizing battery lifespan and performance.

The Mastervolt Mass 24/25-2 charger is equipped with two charging outputs. The main output delivers up to 25 A, and a secondary 3 A output is dedicated to maintaining a small battery bank, such as a starter battery.

The recommended capacity for the main battery bank to be charged with the Mastervolt Mass 24/25-2 is 60 Ah.

The weight of the Mastervolt Mass 24/25-2 230V (DNV GL) charger is 3.5 kg.

The charger uses an automatic 3-step+ IUoUo charging characteristic. This charging program optimizes battery lifespan and includes the following stages:

Bulk (bulk charge): The battery is charged at maximum current until a specific voltage is reached.
Absorption (absorption charge): The voltage is held constant while the current gradually decreases.
Float (float charge): The voltage is lowered to maintain a full battery without overcharging.

At a temperature of 25°C, the default charging voltages are:

Bulk Voltage: 28.50 VAbsorption Voltage: 28.50 VFloat Voltage: 26.50 V (for flooded batteries) or 27.60 V (for Gel/AGM batteries via DIP switch 3)

Yes, the charger is equipped with a MasterBus communication interface. Each MasterBus device has two data ports to form a local network, enabling communication and management between multiple devices.

The Mastervolt Mass 24/25-2 230V (DNV GL) charger complies with the standards and has obtained the following certifications: CE, ABYC A-31, RRR, RMRS, and DNV GL.

Install the Mastervolt Mass charger in a well-ventilated space protected from rain, snow, spray, steam, bilge fumes, humidity, and dust.

The charger is designed to operate within an ambient temperature range of 0 to 60°C (32 to 140°F). Power reduction (derating) is applied above 40°C (104°F) to maintain internal temperature. Humidity must be 0 to 95% without condensation.

For installation, a minimum of tools is recommended:

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 multiple battery banks need to be charged simultaneously via a single output, it is recommended to use a battery isolator. This isolates the different banks to prevent them from discharging each other. The isolator can cause a voltage drop of 0.6 V, which can be compensated by activating DIP switch 4 on the charger (Diode enabled).

Yes, some types of Gel/AGM batteries require a higher Float voltage. By setting DIP switch 3 to the 'On' position, the Float voltage will increase to 27.6 V (for a 24 V charger), optimizing the charge for these battery types.

Yes, the Mastervolt Mass 24/25-2 charger has a specific setting for traction battery charging. By activating DIP-switch 2, the voltage is increased by +0.7 V during the Bulk stage and by +0.4 V during the Absorption stage for 24 V batteries, to meet the requirements of these batteries.