Aku 12,8 V/180 Ah Tark

This Victron Energy Smart battery uses Lithium Iron Phosphate (LiFePO4) technology. This chemistry is known for its robustness, efficiency, and long lifespan, particularly suited to demanding applications such as sailing or off-grid systems.

LiFePO4 batteries offer several significant advantages:

Higher energy efficiency: Round-trip efficiency of 92% compared to about 80% for lead-acid batteries.Long service life: They support a much higher number of charge/discharge cycles.Tolerance to partial discharges: Service life is even slightly improved with partial charges, unlike lead-acid batteries which require regular full charges.Wide operating temperature range: They operate efficiently across a broader temperature range.Low internal resistance: Allows for higher charge and discharge currents with fewer losses.Space and weight savings: Up to 70% savings in space and weight compared to equivalent lead-acid batteries.

This Victron Energy Smart battery has a nominal voltage of 12.8 V and a nominal capacity of 180 Ah at 25 °C. This represents a nominal energy of 2304 Wh at 25 °C.

The round-trip energy efficiency (discharging from 100 % to 0 % and returning to 100 % charged) of this LiFePO4 battery is 92 %. It maintains an efficiency of around 90 % even with shallow discharges.

The cycle life of this LiFePO4 battery depends on depth of discharge (DoD):

2,500 cycles at 80 % DoD (deep discharge). 3,000 cycles at 70 % DoD. 5,000 cycles at 50 % DoD. Capacity is considered at 80 % or more of its nominal capacity at the end of these cycles.

The internal resistance of this Victron Energy Lithium Smart 12.8 V/180 Ah battery is 0.9 mΩ.

The dimensions of this battery are 237 mm (height) x 321 mm (width) x 152 mm (depth). Its weight is 18 kg.

The battery can operate within the following temperature ranges:

For discharge: from -20 °C to +50 °C.For charging: from +5 °C to +50 °C.It is important to respect these ranges to ensure battery safety and longevity.

The maximum continuous discharge current for this battery is 360 A. The recommended continuous discharge current is ≤ 180 A.

The maximum charging current for this battery is 360 A. The recommended charging current is ≤ 90 A.

For optimal performance, recommended charging voltages are:

Charge voltage: between 14 V and 14.4 V (14.2 V is recommended). Float voltage: 13.5 V. These values are for a 12 V system. For a 24 V system, values would be double (28 V to 28.8 V for charging, 27 V for float).

Yes, this battery can be stored. The maximum recommended storage time at 25 °C is 1 year. Check the manual for optimal storage conditions to preserve battery lifespan.

Yes, this 12.8 V battery can be configured in series, parallel, or series/parallel to build a battery bank suited for 12 V, 24 V, or 48 V systems. A system can integrate up to 20 Smart batteries. For 24 V and 48 V systems, it is recommended to use batteries with a higher nominal voltage (e.g., 24 V batteries for a 24 V system) if available, to reduce the required balancing time.

Yes, connecting to a battery management system (BMS) is mandatory for the protection and proper operation of the battery. The BMS ensures disconnection in case of cell undervoltage, stops charging in case of overvoltage or inadequate temperature, thereby protecting the battery and the system.

Victron Energy offers several BMS models suitable for different applications when used with Lithium Smart batteries. Compatible BMS solutions include:

The Small BMSThe VE.Bus BMS V2The VE.Bus BMSThe Lynx Smart BMSThe Smart BMS CL 12/100The Smart BMS 12/200The choice of BMS will depend on your system configuration and specific requirements.

You can monitor the battery status via Bluetooth using the VictronConnect app. This app allows you to view cell voltages, temperature, alarm status, and other critical data. It is also useful for quickly locating potential issues, such as cell imbalance.

Victron Energy Lithium Smart batteries can be connected in:

Parallel: To increase the total capacity of the bank (voltage remains the same).Series: To increase the system voltage (capacity remains the same).Series/Parallel: To increase both voltage and capacity.It is crucial to follow the manual instructions for wiring and ensure all batteries are connected to a BMS for proper protection.

When installing or handling, it is imperative to take the following precautions:

Wear protective goggles and appropriate clothing.Use insulated tools and avoid wearing metallic objects.Never place metallic objects or tools on the battery.Avoid short circuits, deep discharges, and excessive charge/discharge currents.Do not open or dismantle the battery.Handle the battery with care; it is sensitive to mechanical shocks and is heavy (use lifting aids).Do not use a damaged battery.Protect the battery from water.

Yes, these Lithium Smart batteries can be connected in series, parallel, or series/parallel to create a battery bank suitable for 12 V, 24 V, or 48 V systems.

A single system can integrate up to 20 Smart batteries, allowing a maximum energy storage capacity of 84 kWh in a 12 V system and up to 102 kWh in a 24 V or 48 V system.

For 24 V systems, it is recommended to use 24 V batteries. For 48 V systems, it is preferable to use two 24 V batteries in series to reduce the required balancing time.

Battery monitoring is performed via Bluetooth using the VictronConnect application. This app allows you to view cell voltages, temperature, and alarm status in real time, which is very useful for quickly identifying potential issues such as cell imbalance.

Each battery integrates a cell balancing and monitoring system. However, connection to a Battery Management System (BMS) is mandatory to ensure complete protection. The BMS performs the following main functions:

To generate a pre-alarm if a cell voltage drops below 3.1 V (adjustable between 2.85 V and 3.15 V).To disconnect the load if a cell voltage drops below 2.8 V (adjustable between 2.6 V and 2.8 V).To stop the charging process if a cell voltage exceeds 3.75 V or if the temperature becomes too high or too low.