Rafmagnsgeymir MLI Ultra 12/6000 Lithium

This battery uses Lithium Iron Phosphate (LiFePO4) technology. It is the safest lithium chemistry available on the market, offering excellent thermal stability, a very long service life, and weight and space savings of up to 70% compared to traditional lead-acid batteries.

The MLI Ultra 12/6000 provides a nominal voltage of 12 V, an impressive capacity of 460 Ah, and a total nominal energy of 6000 Wh. It is ideal for high-energy onboard systems.

The battery weighs 46.7 kg. Its total dimensions, including terminals and handles, are 622 x 197 x 355 mm (Length x Width x Height).

The battery is designed for approximately 3,500 cycles at an 80% depth of discharge (DoD) and an ambient temperature of 25 °C. This ensures exceptional longevity for your service battery bank.

Yes, parallel connection is unlimited. This allows you to significantly increase the total capacity of your battery bank according to the specific needs of your boat.

Yes, you can connect up to 10 batteries in series. However, note that for systems exceeding 48 V, a separate battery box is required to prevent accidental access to high-voltage components.

The battery’s electronic enclosure has an IP65 rating, ensuring resistance to dust and water spray, making it fully suitable for demanding marine environments.

The battery supports a maximum charging current of 460 A. However, to optimize its lifespan and performance, Mastervolt recommends a charging current of 160 A or less.

The recommended continuous discharge current is 300 A (with a maximum of 500 A for 20 minutes at 25 °C). It can also provide an impressive peak current of 1800 A for 10 seconds, ideal for starting heavy equipment such as thrusters.

The MLI Ultra 12/6000 integrates seamlessly with modern systems thanks to its native compatibility with MasterBus, CZone, and NMEA 2000 protocols. This enables centralized monitoring and energy management on your bridge displays.

Yes, it is mandatory. An external safety relay (such as part number 7700B-BSS) must be added to the installation. The battery management system (BMS) will control this relay to disconnect the battery in case of major risk (overvoltage, undervoltage, etc.).

Yes, the battery is equipped with an advanced integrated Battery Management System (BMS). It provides active cell balancing and continuously monitors the voltage, current, and temperature of each cell to ensure optimal safety.

The battery should be installed in an upright position. If space constraints require, it may also be mounted on its side along the longest edge.

The battery is fitted with M8 bolt terminals. This standard ensures robust and secure cable clamping for high-current applications, essential for handling the high currents required on board.

The MLI Ultra 12/6000 can operate within a service temperature range of -25 °C to 50 °C. For optimal performance and maximum lifespan, an ambient temperature around 25 °C is ideal.

Yes, the integrated BMS continuously monitors cell temperature. It will trigger alarms or cut the safety relay in case of overtemperature or temperatures too low for charging, thus protecting system integrity.

Although LiFePO4 technology does not release toxic gases like lead-acid batteries, the installation manual recommends placing the device in a well-ventilated area to effectively dissipate the heat generated during high-current charge and discharge cycles.

Absolutely. With its large 6000 Wh capacity and its ability to handle very high charge and discharge currents, the MLI Ultra 12/6000 is specifically designed to be the core of the main battery bank for large marine units and highly demanding systems.

If the battery voltage or an individual cell voltage becomes too low (below 11 V or 12.5 V depending on alarm settings), the BMS will trigger a low-voltage alarm. If the condition persists, it will command the safety relay to open to prevent destructive deep discharge.

Via its MasterBus, CZone or NMEA 2000 connections, you can monitor the state of charge (SoC), voltage, temperature, and remaining time directly on a compatible display, such as a dedicated Mastervolt screen or your multifunction chartplotter.