CV CC Mode as text_sensor

[creepystefan]

text_sensor:   
  - platform: modbus_controller
    modbus_controller_id: mod_bus_controller
    bitmask: 0
    register_type: holding
    address: 0x11
    raw_encode: HEXBYTES
    name: "CV CC"
    lambda: |-
      uint16_t value = modbus_controller::word_from_hex_str(x, 0);
      switch (value) {
        case 0000: return std::string("CV");
        case 0001: return std::string("CC");
        default: return std::string("Unknown");
      }
      return x;

for Constant Curent and for Constant Voltage
you have 2 sensor with on off

maybe its help