Well that’s an mqtt sensor, not a template sensor like what was discussed above.
For MQTT sensors you must define an availability topic and payloads as well.
Try adding:
- state_topic: energy/growatt
value_template: "{{ value_json['values']['pvtemperature'] | int(0) / 10 }}"
availability_topic: energy/growatt
availability_template: "{{ value_json['values']['pvtemperature'] | int(0) < 2000 }}"
payload_available: true
payload_not_available: false
unique_id: growatt_inverer_temperature
device_class: temperature
unit_of_measurement: "°C"
name: Growatt - Inverter temperature
state_class: "measurement"
You may need to quote the two availability payloads if it does not work.