Mastervolt MLI Max 48/5400 – new 48V lithium battery

Mastervolt introduces the new MLI Max 48/5400 battery. It is the first of the new MLI Max series, an advanced lithium-ion energy storage solution built for 48V marine and mobile power systems.

The MLI Max 48V replaces complex multi-battery installations with a single unit. An integrated e-switch, a secondary safety disconnect and inrush current limiting protect the system against faults. An IP67 enclosure and an integrated heater keep it working reliably in extreme environments.

An advanced internal BMS constantly monitors cell health. This allows more than 90% of the capacity to be used without overstressing the cells or shortening the battery's life.

Key features:
– 51.2 V / 105 Ah / 5.4 kWh LiFePO₄, purpose-built for 48V systems
– integrated e-switch with independent charge/discharge control and inrush current limiting
– secondary safety disconnect for an additional layer of protection
– IP67 enclosure for demanding marine installations
– integrated heater for cold-weather charging, operating from -20 °C to +60 °C
– CZone, NMEA 2000 and MasterBus communication
– plug-and-play parallel connection of up to 24 batteries
– replaceable Class T fuse in a protected IP67 compartment
– accessible connections and DIP switches with touch-safe covers
– LED status indicators plus integrated cable management, lifting and mounting features
– more than 4,000 cycles; max. continuous discharge 150 A, max. continuous charge 105 A
– dimensions 291 × 184 × 712 mm, weight 45 kg
– CE, E-Mark, UN38.3 and IEC 62619 certified

The MLI Max 48/5400 (part no. 66045400) can be ordered from November 2026, with deliveries starting in December 2026.

Jarušica d.o.o. is the general distributor of Mastervolt for Croatia. For advice on your 48V system, ordering or installation, contact our team.