For the pure grid-connected system, when the photovoltaic power generation exceeds the load consumption capacity, the excess power will be sold to the power grid company at a low price, and some areas are restricted to selling to the power grid company. When photovoltaic power output is insufficient, users have to buy high-priced electric energy from the power grid. As a result, users still have to use some high-priced electric energy from the power grid even when PV is installed, and the electricity cost is not maximized. In addition, in case of unexpected power failure, the pure grid-connected system will start the island protection and stop running, resulting in light abandonment loss. In order to solve the above pain points, and off-grid energy storage system was born。

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