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Mastervolt

66013000

MLI Ultra 12/3000 Lithium Battery

The Mastervolt MLI Ultra 12/3000 lithium-ion battery (12 V, 230 Ah) with LiFePO4 technology is designed to power heavy loads in marine environments with an exceptional lifespan of 3,500 cycles at 80 % discharge. Certified to IP65, it features an advanced Battery Management System (BMS) and seamlessly communicates via MasterBus, CZone, and NMEA 2000 networks for precise monitoring of the electrical installation.

Includes: MLI Ultra battery, MasterBus terminator, safety relay connector with jumper wire, CZone/MB interconnect cable (1 m), two M8 bolts with standard and spring washers, mounting brackets, and user manual.

Retail priceBenefit from the professional rate

2.310,76€

2.310,76€ ~~2.464,80€~~

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In stock

Free pickup point shipping over €150 in France
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Custom installation

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Installers near you

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Support service

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Technical specifications

Battery technology	Lithium Iron Phosphate (LiFePO4)
Nominal voltage	12.8
Capacity	230.0
Energy	2944.0
Integrated BMS	Oui
Mobile app compatibility	Oui
Wired network	CAN
Max charge current (A)	230.0
Recommended charge current	80.0
Max discharge current (A)	500.0
Peak discharge current	1800.0
Discharge cut-off voltage	11.0
Bulk/absorption charge voltage	14.25
Float charge voltage	13.5
Depth of discharge (DoD)	80.0
Cycle life	3500.0
Max batteries in series	10.0
Max batteries in parallel	24
Terminal size	M8
Mounting orientation	Vertical (recommended) or lengthwise
Temperature range (charge)	0 to 50
Temperature range (discharge)	-25 to 50
Storage temperature range	-25 to 50
IP rating	IP65 (electronic housing)
Dimensions (W x H x D)	341 x 197 x 355
Weight	25.4
Housing material	Fiberglass reinforced plastic
Certifications	CE, E-Mark, RVIA, UN38.3, UL1642 (cells only)
Low temperature protection	Yes
Integrated battery monitoring	Oui
Operating temperature range	-25 to 50
Recommended continuous discharge current	200.0

Detailed description

The MASTERVOLT MLI Ultra 12/3000 Lithium Battery (part number 66013000) is a high-performance energy storage solution designed specifically for marine applications and demanding electrical systems. Part of Mastervolt’s MLI Ultra range, which also includes the 12/6000 and 24/6000 models, this 12 V, 230 Ah battery is a robust choice for service battery banks requiring reliable energy and long service life. It outperforms traditional batteries by offering three times the lifespan and a significant reduction in size and weight, up to 70 %.

Exceptional performance and longevity

Based on Lithium Iron Phosphate (LiFePO4) technology, the MLI Ultra 12/3000 delivers a nominal energy capacity of 3000 Wh. Its design ensures a lifespan of 3500 cycles at 80 % depth of discharge (DOD) at an ambient temperature of 25 °C, with a recommended maximum charge rate of C/3 (≤ 80 A) and a recommended discharge rate of C/2 (≤ 120 A). It supports a maximum charge current of 230 A and a continuous discharge current of up to 200 A, with peak discharge currents of 1800 A for 10 seconds. Its low initial internal resistance of 3.52 mΩ ensures high energy efficiency. The battery maintains performance across a wide operating and storage temperature range, from -25 °C to 50 °C, and features a self-discharge rate of less than 4 % per month at 20 °C.

Safety and integrated management

At the core of the MLI Ultra 12/3000 is a proprietary Battery Management System (BMS). This BMS ensures precise voltage balancing across each individual cell and continuously monitors their temperature to prevent failure. It includes protections against overvoltage, undervoltage, and overheating, ensuring safe operation. An external safety relay is required for this battery (e.g., the Mastervolt 7700B-BSS for 12 V systems), adding a critical safety layer by physically isolating the battery bank in any critical situation. The BMS’s self-learning balancing algorithm optimizes charge cycles and extends the battery’s overall lifespan.

Connectivity and system integration

The MLI Ultra 12/3000 battery is designed for seamless integration into modern marine electrical systems. It communicates via MasterBus, CZone, and NMEA2000 protocols, enabling precise monitoring of state of charge (SOC) and consumed Ah, as well as automated charging cycles with compatible chargers and alternators. This advanced connectivity, absent in more basic batteries, maximizes charging efficiency and simplifies system diagnostics. It can be connected in parallel without limit or in series up to 10 batteries (for systems beyond 48 V, a separate battery box is required), offering flexibility for various configurations.

Robust design and simplified installation

With dimensions of 341 x 197 x 355 mm and a weight of 25.4 kg, the MLI Ultra 12/3000 features a robust, watertight enclosure with an IP65 rating for its electronic housing, making it resistant to marine environments and shocks. Its M8 terminals and "plug-and-play" design simplify installation, which is recommended in a vertical position but can also be mounted on its long side. An integrated thermal heating pad ensures optimal charging performance even at sub-zero temperatures. The battery is CE, E-Mark, RVIA, UN38.3, and UL1642 (for cells) certified, attesting to its compliance with international safety and quality standards.

Documentation

Type	Nom
	EN - EU Declaration of Conformity - null
	EN - Safety Data Sheet - null
	EN - Quick Start Guide - null
	FR - Manuel d'installation et d'utilisation - null
	EN - Manuel d'utilisation et d'installation - null

Expert opinion

Pol CONIN

Digital Manager

« The benchmark for high-density energy storage in service battery banks »

The Mastervolt MLI Ultra 12/3000 is a cornerstone for modern service battery bank designs. The LiFePO4 chemistry paired with the proprietary BMS delivers exceptional thermal and electrical stability, capable of handling continuous discharges of 200 A. The requirement to use an external safety relay, while adding a step to installation, guarantees absolute safety by physically isolating the battery bank before any critical failure. Its native integration with CZone and MasterBus networks makes it a must-have for centralized digital systems, enabling precise monitoring and automation of charge cycles with compatible alternators and chargers.

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MLI Ultra 12/3000 Lithium Battery

2.310,76€

2.310,76€ ~~2.464,80€~~

Frequently Asked Questions

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What are the main specifications of the Mastervolt MLI Ultra 12/3000 battery?

The MLI Ultra 12/3000 is a Lithium Iron Phosphate (LiFePO4) battery designed for marine and mobile environments. It provides a nominal voltage of 12 V, a capacity of 230 Ah (approximately 3000 Wh of energy), and stands out for its high energy density.

What is the weight and what are the dimensions of this battery?

This battery is very compact compared to its capacity. It weighs 25.4 kg and its maximum external dimensions (including terminals and handles) are 341 x 197 x 355 mm.

What is the lifespan of the MLI Ultra 12/3000 battery?

It offers excellent longevity with approximately 3500 cycles at an 80% depth of discharge (DOD) and an ambient temperature of 25 °C.

Is it mandatory to install a safety relay with this battery?

Yes, it is strictly mandatory. The system requires installation of an external safety relay (not included, product code 7700B-BSS) directly controlled by the battery to isolate the circuit in case of a critical event such as overvoltage or overheating.

In which position can I install the battery on board?

The battery should be installed in an upright position. However, its design also allows for installation on one of its long sides if space constraints require it.

Can I connect multiple Ultra MLI batteries in parallel?

Yes, the integrated management system allows you to connect an unlimited number of batteries in parallel to increase the total capacity of your house bank.

Is it possible to wire these batteries in series to achieve 24 V or 48 V?

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

What is the recommended charging current to optimize the battery?

Although the battery can accept a maximum charging current of 230 A, it is recommended to charge at 80 A or less to maximize longevity and achieve the specified number of cycles.

What discharge current can this battery support?

The battery can deliver a continuous discharge current of up to 200 A. It can also provide impressive peaks reaching 1800 A for 10 seconds to start demanding equipment.

What is the role of the integrated Battery Management System (BMS)?

The integrated active BMS continuously monitors internal temperature and balances cell voltages. It communicates with your equipment to prevent hazardous overcharging or deep discharging.

Which communication networks is the battery compatible with?

The MLI Ultra 12/3000 communicates natively via MasterBus and CZone protocols (NMEA2000 compatible), enabling seamless integration with your boat’s multifunction displays.

Is the battery water- and dust-resistant?

Yes, the battery’s electronic housing has an IP65 rating, providing effective protection against dust ingress and water jets.

What are the allowed operating temperatures?

The battery is designed to operate and be stored in environments ranging from -25 °C to 50 °C. The ideal nominal operating temperature is 25 °C.

What is included in the box when purchasing this battery?

The delivery includes the MLI Ultra battery, mounting straps, M8 hardware for the terminals, a MasterBus terminator, a CZone drop cable, and the user manual. The safety relay must be purchased separately.

What type of terminals does this lithium battery have?

The battery is fitted with M8 threaded terminals, allowing for a robust and secure connection of power cables in your installation.

Does the battery discharge quickly if I don’t use it?

No, the Lithium Iron Phosphate technology has a very low self-discharge rate, less than 3 % per month at a room temperature of 20 °C.

How does the battery protect itself against deep discharge?

If the voltage drops critically, the BMS triggers a safety event (Battery Safety) and sends a signal to open the external safety relay, thereby isolating the battery to prevent irreversible damage.

How to configure the battery for use on a MasterBus network?

Activation is done via the DIP switches located under the cover of the LED indicators. Simply set DIP switch 1 to the ON position using a small flathead screwdriver.

Why is Lithium Iron Phosphate (LiFePO4) technology used?

LiFePO4 chemistry is renowned as the safest lithium technology on the market. It provides excellent thermal stability, a long service life, and poses no risk of thermal runaway unlike other lithium chemistries.

Can I charge this battery directly from my engine alternator?

Yes, but never directly without suitable regulation. A lithium-compatible charge controller (such as Mastervolt's Alpha Pro) or a DC-DC charger (Mac Plus) is essential to protect the alternator and the battery.