The upper limit of the charge cut-off voltage of a single-chain lithium iron phosphate battery is 3.65V, and the charge cut-off current is 0.02C.
The voltage platform is close to 3.2 V.
48/3.2=15 strings*3.65=54.75 V,
In order to guarantee the duration battery life, it is recommended that the charging cut-off voltage be 54V.
The discharge cut-off voltage of a single string is 2.5V, so the voltage of Discharge cutoff of the 48V module is 15 strings * 2.5V = 37.5V, which is a conservative 38V.
Since it is a module, considering the voltage imbalance of a single string, it is necessary to add a single string voltage detection. When one of the strings is lower than 2.3V, it is recommended to cut off the output.
The above is just my personal opinion.
The lithium iron phosphate battery model indicates the voltage in amps. The 48 V 20A that you mentioned is incorrect. If the 20A you mentioned is the normal operating current of the battery, you can choose 30A protection. advice. . But you should pay attention to whether you want to specify the instantaneous current of the protection board to protect your working circuit. Will long-term high current burn out your electrical appliances? These are all things that need to be considered when choosing a protection card?