Victron Smart-a 25.6V/200Ah Lithium Battery - LiFePO4

Victron Smart-a 25.6V/200Ah Lithium Battery - LiFePO4

Lithium iron phosphate batteries (LiFePO4 or LFP) are the safest among traditional lithium-ion batteries. The nominal voltage of an LFP cell is 3.2 V (leaded: 2 V/cell). A 12.8 V LFP battery is made up of 4 cells connected in series, and a 25.6 V battery is made up of 8 cells connected in series. The status of cell temperature and voltage alarms can be supervised by Bluetooth. Very useful function to locate a (possible) problem, such as an imbalance on the cells for example. It is not necessary to fully charge an LFP battery. The lifespan even improves slightly when partially charged instead of fully charged. This represents a major advantage of the LFP battery over the lead acid battery. These batteries have other advantages such as a wide operating temperature range, excellent cycle completion performance, low internal resistance and high efficiency (see below). For many applications (especially stand-alone solar and/or wind applications), energy efficiency can be of critical importance. The round trip energy efficiency u0013 discharge from 100% to 0% and back to 100% charged u0013 of an average lead-acid battery is 80% The round trip energy efficiency of a lithium-ion battery is 92%. The charging process for lead acid batteries becomes particularly inefficient when the state of charge has reached 80%, giving efficiencies of 50% or even less in the case of solar systems when several days of reserve power is required (battery running with a state of charge of 70% to 100%). In contrast, an LFP battery will achieve 90% efficiency under light discharge conditions. LFP batteries are very expensive compared to lead acid batteries. But for demanding applications, the high initial cost will be more than offset by extended life, superior reliability and excellent efficiency. LFP batteries are equipped with cell balancing and monitoring functions. Up to 5 batteries can be installed in parallel and up to 4 x 12 V batteries or 2 x 24 V batteries can be connected in series: thus a 48 V battery bank of up to 1500 Ah can be assembled. Cell balancing/monitoring cables can be daisy-chained, and they must be connected to a Battery Management System (BMS).