Hey i would like to sum 3 values for one sensor, however when i use operand + i am getting a string any sugeestions
TP:
friendly_name: "Main Total Power"
unit_of_measurement: 'KWh'
value_template: "{{ states('sensor.main_l1_power')+states('sensor.main_l2_power')+states('sensor.main_l3_power')}}"