Victron Smart Lithium 50 Ah LiFePO4 12.8V Battery

Space and weight-saving batteries with Victron Lithium Iron Phosphate Technology

Why Lithium Iron Phosphate?
The Lithium Iron Phosphate (LiFePO4 or LFP) battery is the safest of the regular lithium-ion battery types. The nominal voltage of an LFP cell is 3.2V (lead-acid: 2V/cell). A 12.8V LFP battery therefore consists of 4 cells connected in series, and a 25.6V battery consists of 8 cells connected in series.

Robust
A lead-acid battery will prematurely fail due to sulfation in the following cases:

• If it operates for a long time in an insufficiently charged state (i.e., if the battery is rarely or never fully charged).
• If it is left in a partially charged or, even worse, completely discharged state (yacht or motorhome during winter).

An LFP battery does not need to be fully charged. The operational life even increases slightly if the battery is only partially charged instead of fully charged. This is a significant advantage of LFP batteries compared to lead-acid batteries.
Further advantages include a wide operating temperature range, excellent cycling, low internal resistance, and high efficiency (see below).
The LFP battery is therefore the best choice for demanding use.

Efficient
In many applications (especially off-grid solar and/or wind power systems), energy efficiency can be crucial.
The energy efficiency of a charge cycle (discharging from 100% to 0% and recharging to 100%) of an average lead-acid battery is approximately 80%. The energy efficiency of a charge cycle of an LFP battery, on the other hand, is 92%.
The charging process of a lead-acid battery becomes particularly inefficient when the 80% state of charge mark is reached. This results in energy efficiencies of only 50%.
In solar systems, this value is even lower, as energy reserves for several days are needed there (the battery operates in a state of charge between 70% and 100%).
An LFP battery, on the other hand, still achieves an energy efficiency of 90%, even when in a shallow discharge state.

Size and Weight
Space saving of up to 70% Weight saving of up to 70%

Expensive?
LFP batteries are expensive compared to lead-acid batteries. However, the higher acquisition costs will more than pay off in demanding applications due to their longer operational life, high reliability, and excellent energy efficiency.

Bluetooth
Cell voltages, temperature, and alarm status can be monitored via Bluetooth. This is very useful for detecting a (possible) problem such as cell imbalance.

Battery Management System (BMS)
The BMS connects to the BTVs and its main functions include:

• interrupting or switching off the load if the voltage of a battery cell drops below 2.5 V.
• stopping the charging process if the voltage of a battery cell rises above 4.2 V.
• shutting down the system if the cell temperature exceeds 50 C.

Victron LFP batteries feature integrated cell balancing and cell monitoring functions. Up to ten batteries can be connected in parallel and up to four batteries in series, allowing for the assembly of a 48 V battery bank with up to 3000 Ah. An example wiring diagram can be found in the product images. The cell balancing/monitoring cables can be daisy-chained and must be connected to a Battery Management System (BMS).

Technical Data:

Documents & Downloads

• Datasheet