Use two entities

[MarkoSchweizer]

Hi,
I am new to HA. The integration of my solar system is my first project. I actually try to display the values of the solarman integration to a power flow card. This is the code:

type: custom:power-flow-card
All: sensor.solarman_activepower_pv_ext + sensor.solarman_activepower_pv_ext
entities:
battery: sensor.solarman_battery_1_power
battery_charge: sensor.solarman_battery_1_soc
grid: sensor.solarman_activepower_pcc_total
solar: sensor.solarman_activepower_pv_ext
inverted_entities: battery, grid

I can't figure out how I can add more than one entitie to "solar".

Please help!

Best regard