The state of charge of an LFP battery cannot be measured. It is a calculated value.
In general, the state of charge of a battery is calculated using the voltage, but other factors such as temperature, current flow and charging behavior also play a role. The calculation of the state of charge is generally more accurate if the battery regularly sees full cycles. Otherwise, SOC calibrations may occur. See also corresponding section in service checklist: https://docs.eft-systems.de/download/DOC-00044&_lang=en
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