Lithium-iron-phosphate (LiFePO4 or LFP) is the safest of the mainstream li-ion battery types. 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 LFP battery does not 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.
Note: Requires one of these BMS options below (sold separately):
VE.Bus BMS- Recommended for systems with our inverter/chargers. smallBMS- Recommended for use in small systems. Battery Management System BMS 12/200- Recommended for use in Automotive and Marine systems having DC-loads and Alternators. Smart BMS 12/200- Recommended for use in Automotive and Marine systems having DC-loads and Alternators. Smart BMS CL 12/100- Recommended for use in Automotive and Marine systems having DC-loads and Alternators. Lynx Smart BMS- Recommended for use in large systems.
Rugged- 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).
Efficient- 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 lead acid battery is 80%. The round-trip energy efficiency of a LFP battery is 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- - Saves up to 70% in space - Saves up to 70% in weight
Expensive? LFP batteries are expensive when compared to lead-acid. But in demanding applications, the high initial cost will be more than compensated by longer service life, superior reliability and excellent efficiency.
Bluetooth- With Bluetooth cell voltages, temperature and alarm status can be monitored. Very useful to localize a (potential) problem, such as cell imbalance.
Battery Management System (BMS)- The BMS will: 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.
*See the BMS datasheets for more features
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