The generated solar energy is fed into the grid, which serves as an energy storage device. When the electricity load is large and solar power is insufficient, power is purchased from the city power supply. When the load is small, or when the power cannot be used up, the excess power can be sold to the city power. Improve the mean time between failures of the system and secondary pollution of the battery, and reduce the cost.
                                                                                                                                                    
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