Why not use the inverter_efficiency sensor exposed by the integration?

[kiwipaulrob]

In my install of the integration I have a sensor called inverter_efficiency which tracks up and down. Why is this not used here?

[JensenNick]

To my knowledge sensor.inverter_efficiency only tracks inverter without a battery connected. In my case the sensor is constantly showing 100% on my 10KTL-M1 (the inverter which has my battery connected).