nan as value

[littleyoda]

[A reminder for myself and for the record]
Interface enneox-os

"ValueError: Sensor sensor.sunny_boy_smart_energy_5_0_battery_power_charge_total has device class 'power', state class 'measurement' unit 'W' and suggested precision 'None' thus indicating it has a numeric value; however, it has the non-finite value: 'nan'"

Sometimes the inverter returns "nan" (not a number) instant of a measurement.
One possible way of handling this would be to return an unavailable value to HA.