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FAQ: Battery protection against discharge
Question: How should the battery be protected against deep discharge
The protection against complete discharge for LiFePO4 batteries is very important.
If you discharge the battery bellow the minimal voltage, the battery is damaged forever.
To make the solution stable, there should be a dual protection. One protection is on the side of the BMS (battery monitor system). This means the battery has its own management that gives input (commands) to control the load from the batteries. The BMS gives “low voltage” and “cut-off” voltage signals. When the “low voltage” status is reported by BMS, the controller should reduce the power of the engine. (E.g. 50% or 30% of the full power). When the “cut-off” voltage signal is reported, the controller should disconnect the load (the engine) from the battery.
However the controller should have its own protection. This is the secondary protection. This protection means that in case the BMS does not send battery signals correctly, the controller will disconnect the load (the engine) from the battery anyway.
Only the dual protection can make the system user-friendly and safe for ordinary customer (user).
