Pylontech UF5000 Series - Page 28

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2) The one with empty Link Port 0 is the Master Battery Module, others are
slaves (1 master battery configuring maximum 19 slave batteries).
3) Press the red SW button of master battery to power on. After the master
battery LED turns on, the LEDs on all the slave batteries will be on at the
same time.
Link Port 0
SW