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https://www.alphaess.com/residential-energy-storage-system

At present, there are two kinds of home energy storage systems:  grid-connected home energy storage system and the other is off-grid home energy storage system. Home energy storage lithium battery packs give you access to safe, reliable and sustainable energy. It ultimately leads to an improved quality of life. Household energy storage products can be installed with household energy storage lithium battery packs. It can be installed in photovoltaic off-grid application scenarios or even in households without photovoltaic systems

Home energy storage lithium battery pack has more than 10 years of service life. The modular design allows multiple energy storage units to achieve a more flexible parallel connection. It is simple, fast, and can significantly improve the storage and utilization of energy.
The grid-connected home energy storage system consists of five parts, including: solar cell array, grid-connected inverter, BMS management system, lithium battery pack, and AC load. The system adopts a hybrid power supply of photovoltaic and energy storage system. When the main loadis expected, the photovoltaic grid-connected system and the mains supply power to the load; When the main load is off, the energy storage system and the photovoltaic grid-connected system are combined to supply power.
Off-grid household energy storage system is independent, and there is no electrical connection to the power grid. Therefore, the whole system does not need a grid-connected inverter, and a photovoltaic inverter can meet the requirements.
The off-grid home energy storage system can be divided into three working modes. Mode 1: Photovoltaic provides energy storage and user electricity (sunny days); Mode 2: Photovoltaic and energy storage batteries provide electricity for users (cloudy days); Mode 3: Energy storage battery provides user power (evening and rainy days).