With the continuous development of the “Million Solar Roof Plan” in the United States and the “Energy Transition” in Germany, household energy storage systems, especially the government’s high subsidies for private use of photovoltaic power, have enabled most people to achieve self-sufficiency in household electricity. The ability to store excess electricity has led to the rise of the home energy storage market in Germany and even Europe.
The home energy storage system is similar to a miniature energy storage power station, and its operation is not affected by the city’s power supply pressure. During the low power consumption period, the battery pack in the home energy storage system can be recharged by itself to be used during peak or power outages. In addition to being used as an emergency power source, the household energy storage system can also balance the power load, thereby saving household electricity expenses.
Although the current market demand for home energy storage systems is more driven by the people’s need for emergency backup power, in the industry’s view, the use of home energy storage systems can combine new energy power generation systems such as solar energy, promote the promotion of new energy, and build intelligence The power grid has a broad market prospect.
Home energy storage systems are currently divided into two types, one is grid-connected home energy storage system, and the other is off-grid home energy storage system.
The grid-connected home energy storage system consists of five major parts, including: solar array, grid-connected inverter, BMS management system, battery pack, and AC load. The system adopts a mixed power supply of photovoltaic and energy storage systems. When the mains power is normal, the photovoltaic grid-connected system and the mains supply power to the load; when the mains power is off, the energy storage system and the photovoltaic grid-connected system are jointly powered. The grid-connected household energy storage system is divided into three working modes. Mode 1: Photovoltaic provides energy storage and residual electricity to go online; Mode 2: Photovoltaic provides energy storage and some users use electricity; Mode 3: Photovoltaic only provides partial energy storage.