LiFePO4 Victron 12.8V-50Ah Smart battery
LiFePO4 Victron 12.8V-50Ah Smart battery, like all by LiFePO4, ia one of the safest ones on the market. The nominal voltage of a 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.
A lead-acid battery will fail prematurely due to sulfation:
If it operates in deficit mode during long periods of time (i.e. if the battery is rarely, or never at all, fully charged).
if it is left partially charged or worse, fully discharged (yacht or mobile home during wintertime).
In the contrast, LiFePO4 Victron 12.8V-50Ah Smart battery doesn’t need to be fully charged. Service life even slightly improves in case of partial charge instead of a full charge. This is a major advantage of LFP compared to lead-acid. Other advantages are the wide operating temperature range, excellent cycling performance, low internal resistance and high efficiency (see below).
LFP is therefore the chemistry of choice for demanding applications.
In several applications (especially off-grid solar and/or wind), energy efficiency can be of crucial importance.
The round-trip energy efficiency (discharge from 100% to 0% and back to 100% charged) of the average leadacid battery is 80%.
In the contrast, the energetic efficiency of the full cycle of the LiFePO4 Victron 12.8V-50Ah Smart battery is about 92%.
The charge process of lead-acid batteries becomes particularly inefficient when the 80% state of charge has been reached, resulting in efficiencies of 50% or even less in solar systems where several days of reserve energy is required (battery operating in 70% to 100% charged state).
In contrast, a LFP battery will still achieve 90% efficiency under shallow discharge conditions.
Size and weight of the LiFePO4 Victron 12.8V-50Ah Smart battery
Compared to a lead-acid battery with the same characteristics, you can save up to 70% in weight and space, which makes them ideal for applications in boats and caravans with limited space for energy storage systems.
¿Are LiFePO4 batteries profitable?
LFP batteries are expensive when compared to lead-acid, but if yuo gice them a lot of use, the inicial price will be compensated by an excellent eficiency. But in demanding applications, the high initial cost will be more than compensated by longer service life, superior reliability and excellent efficiency.
Thanks to its Bluetooth connection, it is easier than ever to know the status of the battery and monitor parameters such as cell voltage, temperature or alarm status. Very useful to localize a (potential) problem, such as cell imbalance
As it has Bluetooth, the battery can communicate with VictronConnect app. The VictronConnect app is used to read battery information, make or modify battery settings, receive alarms, and update firmware.
LiFePO4 batteries, as a LiFePO4 Victron 12.8V-50Ah Smart one, have control and balance in the integrated cells. Up to 5 batteries can be paralleled and up to four 12V batteries or two 24V batteries can be series connected, so that a 48V battery bank of up to 1500Ah can be assembled. The cell balancing/monitoring cables can be daisy-chained and must be connected to a Battery Management System (BMS).
Battery managing system (BMS)
El BMS is connected to BTV and its main functions are:
1. Generate a pre-alarm whenever the voltage of a battery cell decreases to less than 3,1V (adjustable 2,85 – 3,15 V).
2. Disconnect or shut down the load whenever the voltage of a battery cell decreases to less than 2,8V (adjustable 2,6 V – 2,8 V).
3. Stop the charging process whenever the voltage of a battery cell increases to more than 3,75 V or when the temperature becomes too high.
4. Turn off the system every time the temperature goes over 50°C