If a battery is fully charged every drop of energy as passed by the controller is available to the inverter free of charge. The Charge Efficiency Factor only applies if the energy gets stored in the battery.
If a battery charged vigorish to pass power when it was fully charged, it would explode. The controller is the secret. With battery acting as a ballast what percentage of power can it pass direct from panel to inverter. This is a watts loss percentage equation. Panel watts potential to inverter available watts potential should be expressed as well. What are losses at low panel delivery and maximum panel delivery?
