Effective usage of solar power generation and storage battery combined system

Solar power is very useful renewable energy, got anywhere. But it is got only in the daytime on sunny days. On the other hand, sometime the grid cannot receive overflowed solar power when electric demand is small. Recently storage battery is utilized in the grid, in the household, combined with solar power generator for accumulating overpowered electricity and emitting it after sunset. It is very useful to utilize solar power effectively and efficiently. It is also useful on the power failure. But we have very little information of technical traits of storage battery, such as energy loss with accumulating and emitting electricity. Building Research Institute in Japan has a demonstration house, which has solar power generator and storage battery combined system. The authors have measured generated solar power, accumulated and emitted overpowered electricity of solar power generation and storage battery combined system for a year. Lots of traits of solar power and storage battery combined system are got. The authors have made modeling and formulation solar power and storage battery combined system, incorporating these traits. In this way, efficiency and effectiveness of solar power generator and storage battery combined system with any generation, storage capacity, can be evaluated with this formulation.