Congratulations on the work, the discussion is interesting. However, I believe that this analysis may vary by location and current incentives of governmental organizations. Also highlighting the problem of disposal and battery life.
Hybrid PV systems (battery and electrical-grid) with intelligent control deserve to be explored more.
The topic is interesting and hot and the results are promising. This will be more feasible with higher cost of the conventional fuel sources. The use of battery storage in PV grid connected systems can help make the system more economical by:
-Supplying excess power at the peak hour consumption. So, it affects some equalization of the loads.
- The other important factor that it could be used for improving the power factor of the grid.
The draw back is the relatively short lifetime of the batteries. Increasing the lifetime of the batteries appreciably may lead to more benefits for Hybrid systems.