MLI Ultra 1250 12 V / 100 Ah Lithium Charger/Inverter Combo Pack

Available within 2-3 weeks
SVB price: €2,889.87
Excl. VAT, excl. shipping costs.
This is a NET-price excluding German VAT. Shipments to countries outside of the EU may be subject to import duties and taxes.
€2,889.87 This is a NET-price excluding German VAT. Shipments to countries outside of the EU may be subject to import duties and taxes.
Available variants:
Item no.
MASTERVOLT Lithium 12V 100A Set incl. Easyview 5 and CombiMaster 12/2000-60
Device type
Charger/inverter combined
Charging Current
60 A
Charging outputs
Battery nominal voltage
12 V
Network AC voltage
170 - 280 V
Battery type
Lead/Acid, AGM, GEL, Lithium (LifePO4)
Battery Capacity
180 - 500 Ah
Continous Power
1600 W
Temperature sensor can be connected
Power Lead
Integrated fan
Integrated charging cable
Optional remote display/operation
28.4 cm
37.1 cm
15.5 cm
6.9 kg
12 V
230 V
AC connection
Peak power
2400 W

Product details


MASTERVOLT MLI Ultra 1250 Lithium Battery

incl. CombiMaster 12/2000-60 (230 V) & EasyView 5


Maximum operational reliability in perfect balance with this set from MASTERVOLT - future-oriented lithium technology that you can rely on. The MASTERVOLT MLI Ultra is a lithium power pack with a capacity of 100 Ah (at a voltage of 12 V). With LiFePO4 chemistry and high-tech BMS, MASTERVOLT guarantees the best possible standards in terms of safety, whilst maintaining the high quality the company is known for.

Note - Installation of the 230V inverter connection should be carried out by a specialist company.


The advantages of MLI Ultra 1250 lithium technology

  • High safety standards thanks to LiFePO4 chemistry and integrated high tech Battery Management System (BMS).
  • Significantly higher life cycle compared to conventional lead-acid batteries.
  • Heavy duty, extreme performance with a discharge rate of up to 2 C (max. 200 A for 3-5 minutes at ≥ 25°C)
  • Perfect for use as a starter battery, for bow thrusters or consumers.
  • Fast charging thanks to high charging currents of up to 0.5 C (50A)
  • Integrated MasterBus interface for complete NMEA2000 network compatibility
  • Sophisticated low-temperature control and integrated thermal heat pad to ensure maximum charging performance even when temperatures drop below freezing
  • Series connection of up to 4 MLI Ultra 12/1250 possible / 2 MLI Ultra 24/1250 (max. 48 V)
  • Integrated battery switch - disconnects battery cells in case of abnormalities for maximum safety
  • Similar in size to comparable acid-lead, AGM or GEL batteries
  • Low weight - just 15 kg

The Perfect Match

In combination with the MASTERVOLT CombiMaster 12 V / 2000 W / 60 A, not only do you benefit from maximum performance, but also the highest possible safety for your lithium system. Using the MasterBus interface to connect your MASTERVOLT MLI 1250 Ultra and the CombiMaster charger/inverter is the best way to charge your battery and increase its life span at the same time. When the MLI Ultra and Chargemaster charger are connected via the MasterBus interface, the CombiMaster can automatically apply the best settings for the battery in real time depending on the current situation.

Installing a lithium-ion battery has never been easier. Hook up your MLI Ultra 1250 to the MASTERVOLT CombiMaster unit and connect the two units using the MasterBus interface and the battery will automatically fully configure the CombiMaster unit with the ideal settings for the battery, making your charging experience hassle-free and avoiding the need for configuration tools.
Thanks to the NMEA2000 interface (micro-C connector), the MASTERVOLT MLI litihum battery can be quickly and easily integrated into an existing NMEA2000 network. With compatible devices, you can retrieve data from the battery at any time.

View a range of information on the SmartRemote display via the MASTERVOLT CombiMaster using the MasterBus interface. Display key parameters, such as current supply, the power of the charger, as well as the voltage and temperature of the connected batteries.

MLI System

Compact charging & conversion


CombiMaster 12 V / 2000 W / 60 A (230V)

The Mastervolt CombiMaster series combines easy operation, reliability and state-of-the-art charging and network technology. The powerful CombiMaster devices drive even the heaviest and most sensitive loads with ease.

With the CombiMaster series, power dips and failures are a thing of the past. Thanks to automatic AC transfer system, the CombiMaster switches between generator or mains and inverter output, ensuring a constant power supply. Its Power Assist function protects the mains fuse when you’re connected to a weak land line or small generator.

Expect unrivalled performance and unbeatable value for money.

Thanks to an integrated MasterBus, CZone and NMEA2000 interface, the CombiMaster series is compatible with almost all current network technologies and end devices, allowing for a broad range of monitoring and system integration options.
  • Most compact and lightweight Combi in its class
  • Reliable, hum-free and longer operation from your batteries
  • Starts even the heaviest and most sensitive loads
  • Intelligent 3-step+ battery charger for faster and safer charging
  • Automatic switching between mains and inverter mode
  • Power Assist prevents blown mains fuses
  • Generator compatible
  • Integrated CZone, MasterBus and NMEA 2000 communication
  • Quick installation with heavy duty connections
  • E-mark certified

Everything in View

EasyView 5 Display

Controlling your Mastervolt system has never been easier thanks to this waterproof system monitor, which features a 'daylight-readable' display and an intuitive touchscreen. EasyView 5 features a sharp, waterproof display which is clearly readable in daylight. Thanks to the colour touchscreen and multi-language menu, the display is a pleasure to operate. Easily customisable favourite pages show all relevant system information at a glance.

Alarms & logs - No surprises! The EasyView 5 helps to keep your system in top condition by assisting you with alerts. Logging of the alarms provides valuable insight in the operation of your system.


  • Waterproof, ‘daylight readable’ colour display
  • Intuitive touch control
  • Customisable favourite pages
  • Log book for warnings and alarms
  • Buzzer and Home button
  • Easy mounting: front mount, wall mount or retrofit
  • Power supply via MasterBus and USB


Technical specifications:

MASTERVOLT MLI 1250 Lithium Battery

Specifications / technical data
General specifications
Battery chemistry Lithium Iron Phosphate, LiFePO4
System voltage 12 V 24 V
Nominal voltage 12.5 V 25 V
Capacity 100 Ah 50 Ah
1250 Wh
Cycles 3500 cycles at 80 % DOD at 25 ⁰C
Self-discharge < 3 % / month
Parallel / series connection Battery banks (clusters) can be assembled from up to 2 or 4 identical batteries,
system voltage max. 48 V.
Mixing 12 or 24 V MLI Ultras is not permitted.
Parallel / series connection with lead-acid types is not permitted!
Charge / discharge
Charge characteristic 3-stage CCCV (IUoUo)
Max. charging voltage (Bulk/Absorption) 14.25 V 28.5 V
Final charging voltage (Float) 13.5 V 27 V
Max. cont. charging current 100 A (1 C) 50 A (1 C)
Recommended charging current ≤ 50 A (0.5 C) ≤ 25 A (0.5 C)
Continuous discharge current 100 A (1 C) 50 A (1 C)
Max. discharge current
3-5 minutes at ≥ 25°C
200 A (2 C) 100 A (2 C)
Peak discharge current
10-15 seconds at ≥ 25°C
500 A (5 C) 250 A (5 C)
Discharge cut-off voltage
(temperature > 0°C, discharge current < 1 C)
10 V 20 V
Operating conditions
Nominal operating temperature 25 °C
Operating temperature range -20 to 50 °C
Note on temperature during charging If a charger is connected and the battery temperature is below 0 °C, the internal heater switches on until 5 °C is reached or the charger is disconnected.
It takes about an hour for the battery to warm up from -20 °C to above 0 °C.
Charging at temperatures < 5 °C may result in the battery not being charged, and the charging current being used to heat the cells first.
Temperatures below 5 °C and above 25 °C can affect the service life and the number of charging cycles.
Storage temperature -20 to 55 °C
Relative humidity 10 to 95, non-condensing
Battery monitoring / BMS Integrated
(Safety) disconnect switch Integrated, also can be switched manually
MasterBus-connection Yes
MasterBus power supply option Yes
CZone / N2k compatibility Yes
Waterproofing IP65
Certification CE, E mark
Mechanical properties
Battery connection M8 threaded blind holes or conical SAE car battery pole adapters (included)
Installation position upright (recommended)
or lying on the longest side
Dimensions LxWxH
without / with car battery pole adapters and carrying handle
330 x 173 x 210 / 228 mm
Weight: 15 kg / 33 lbs
Connections M8 threaded blind holes or
conical DIN/EN car battery terminal adapters, tightening torque 14.7 - 19.6 Nm
Installation position Upright (recommended) or
lying on the longest side

  • All MASTERVOLT lithium batteries are designed to stop charging by themselves!
    The BMS sends a "Stop Charge" command, which switches off the connected MASTERVOLT charging technology (chargers, DC/DC charging converters or alternator high-power regulators) via a MasterBus connection. Each lithium battery and charging source must be configured via USB interface (optional accessory) and MasterAdjust software.
  • The "Stop Charge" command must be executed directly!
    For charging technology not from MASTERVOLT (alternators, shore power chargers, solar regulators, wind generators, etc.), a powerful relay must be provided as an option, which is controlled via the AUX line (included in the delivery) and interrupts the connection between the charging source and the lithium battery. (Even when using third-party charging technology, configuration and "Stop Charge" function control should be carried out via USB interface and MasterAdjust software).
  • The MLI Ultra is supplied ready for use in a MasterBus network or as a stand-alone battery.
    For CZone and for advanced functions, the settings must be adjusted. Most settings can be adjusted via DIP switches.
    Advanced or network settings are configured via a Windows laptop or notebook, using either an optional USB interface and the free MasterAdjust software or the CZone configuration tool/programme. The MasterAdjust software is available free of charge at under downloads.
  • The MLI Ultra records the following historical data: The number of charge cycles, when the last (100%) full charge occurred, the total capacity used and the lowest and highest battery voltage.

Technical specifications:

MASTERVOLT CombiMaster 12V / 2000W / 60A

Nominal voltage 12 V (10.2 to 16 V)
Output voltage 230 V
Output frequency 50/60 Hz (configurable)
Continuous output 2000 VA / 1600 W
Peak performance 3000 VA / 2400 W
Surge power 4000 VA / 3200 W

Specifications - battery charger
Input voltage range 170-280 V
Max. input current 6 A (adjustable)
Max. charge current 60 A at 14.25 V (configurable)
Temperature sensor Yes

Specifications - transfer system
AC input 25 A
AC output 33 A
AC input fuse Yes
Transfer speed 10 ms

General specifications
Display LED display
Dimensions (h x w x d) 371 x 284 x 155 mm
Weight: 6.9 kg
Charge characteristic UoUo, automatic / 3-step+ for flooded, Gel/AGM and MLI
Recommended battery capacity 180-500 Ah
Temperature range -25 to +60 °C
Cooling Vario fan
Waterproof IP23
MasterBus compatible Yes
CZone / NMEA 2000 compatible Yes

Technical specifications:


Power supply MasterBus powered, or 12/24 V input
Resolution 480 x 272 pixels
Colour depth 16 bits
Display 4.3 inch high contrast display with capacitive touch control
Languages on display English, Dutch, German, Spanish, Italian, French, Finnish, Swedish, Norwegian, Danish
Installation Front mount, wall mount and MasterView Easy retrofit
Dimensions (h x w x d) 113 x 127 x 43 mm
4.4 x 5.0 x 1.7 inch
Weight: 0.315 kg
0.7 lb
Alarms Integrated buzzer
Included in delivery UV protection cover
MasterBus-connection Yes
power consumption < 160 mW (idle mode)
Connections 2x MasterBus, USB, 12/24 V
Level of protection IP67; waterproof front


en-flag Manual
PDF, 4,05 MB
en-flag Short manual
PDF, 460,21 KB
de-flag Datasheet
PDF, 577,81 KB
de-flag Manual
PDF, 4,09 MB
es-flag Manual
PDF, 3,99 MB
fr-flag Manual
PDF, 4,05 MB
it-flag Manual
PDF, 3,23 MB
multi-flag Manual
PDF, 2,34 MB
multi-flag Safety datasheet
PDF, 426,68 KB
nl-flag Manual
PDF, 3,96 MB

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