Lithium iron phosphate (LiFePO4) and increasingly also lithium manganese cobalt (LMC) battery systems are the modern basis for a professional power supply.
They have outstanding properties such as very high charge and discharge currents with very good voltage stability, which creates a powerful and safe system. The service life is significantly longer compared to conventional lead acid batteries.
The charging can be done with a normal GEL/AGM – battery charger and adapted characteristic below 0°C. At lower temperatures, charging may only be carried out at max. 0.1 C.
The high current output capability of 1C – 3C charge and discharge current continuously and up to 10C for a short time.
The maximum power is available until complete discharge (no „voltage or capacity collapse“, as with lead-acid batteries) These features make lithium batteries interesting for high current applications e.g. combi inverters.
Unlike lead-acid batteries, lithium iron phosphate batteries can be stored in a partially discharged state for a long period of time without permanent damage.
A 210 Ah LiFePO4 battery weighs 23 kg compared to a lead battery weighing 70 kg with the same nominal capacity.
Existing capacity can be used completely
The full battery capacity is available, whereas with lead batteries only about 50% of the nominal capacity is available in real terms.
The integrated battery management system BMS, in conjunction with an internal or external relay, protects the lithium cells against overcharging and deep discharge and monitors the cell temperature. Individual cell balancing is also performed.
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