Yours is called a same-port protection board, and the output and input are all on the same line (in addition, small-power lithium batteries often have separate protection boards , with two ports for charging line and output line). If you want to charge and output at the same time, you need to use one or two, convert them to two identical pins and plug them into each.
Are you considering charging the solar panels simultaneously? It should be equipped with a solar panel voltage regulator and set the output voltage to the fully charged voltage of the lithium battery (for example, the voltage of ternary string thirteen is 54.6V, used for 48 V battery cars)
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