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Mastervolt Lithium Ion MLI Ultra 5500
Cat. No. MV-660x5500

MLI Ultra 24/5500
Heavy Duty, Extreme Performance
The MLI series delivers extreme Lithium Ion performance even under the harshest conditions, such as high charge and discharge currents, wet environments, mechanical shocks or vibrations. This is realized by combining our best Lithium-Iron Phosphate (LiFePO4) cells with a proprietary Battery Management System (BMS) inside a sturdy, waterproof housing.

The sophisticated Mastervolt BMS ensures optimal use of each individual cell. Integrated battery monitoring provides you with accurate and up-to-date information on the state of your battery. Integrated NMEA 2000, CZone* or MasterBus communication allows complete system integration, to ensure the best possible recharging, while maximizing the lifetime of your battery.

  • Extreme performance, heavy duty Lithium Ion batteries.
  • BMS and LiFePO4 chemistry according to highest safety standards.
  • Saves up to 70 % in space and weight.
  • More than three times the life span of traditional batteries.
  • Fast charging within 60 minutes.
  • High charge / discharge rate up to 2.5 C.
  • Integrated battery monitoring (Ah consumed, state of charge).
  • Series connection up to 10 batteries possible.
  • MasterBus communication with any Mastervolt battery charger.
  • CZone and NMEA 2000 compatible (expected January 2020).
  • Waterproof electronics compartment.
  • Designed according to UN38.3.
  • CE, E-Mark and DNV-GL (pending).
For additional safety, Mastervolt stipulates the use of a safety relay as mandatory part of the battery installation.
  • safety relay 24 volt, product code 7702B-BSS
General specifications
Nominal battery voltage 26.4 V  / 13.2 V
Nominal battery capacity 200 Ah / 400 Ah
Nominal battery energy capacity 5500 Wh
Cycle life 3500 cycles at 80 % DOD at 25 ^(0)C, max. C3 charge and C2 discharge
Max. charge current 500 A (2.5 C)
Continuous charge current 200 A (1 C)
Continuous discharge current 500 A (2.5 C)
Peak discharge current 2000 A (10 C) for 10 s
Battery monitoring integrated
MasterBus communication yes
CZone / NMEA 2000 communication yes, pending (January 2020)
Battery terminals M8
Mounting position upright or either long side
Max. outer dimensions (incl. terminals/grip handles),
622 x 197 x 355 mm
24.5 x 7.8 x 14.0 inch
Product weight 57 kg
125.7 lb
Shipping weight 60 kg
132.3 lb
Approvals CE, E-Mark and DNV-GL (pending)

Technical specifications
Battery chemistry Lithium Iron Phosphate
Protection degree IP65 (electronics cabinet)
Parallel connection yes, unlimited
Series connection yes, up to 10 batteries - systems over 48 V require a separate battery box to prevent access to high voltage parts
Protections over voltage, under voltage, over temperature
Safety relay to be added mandatorily, product code 7702B-BSS 24volt and 7000B-BBs for 12 Volt
Safety relay controls integrated

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