A battery energy storage system (BESS) is a battery system used to store energy and meet the daily energy needs of a home.
By sourcing and storing power during non-peak times, BESS alleviates the stresses and strains on the grid during peak demand periods. This self-sufficiency helps reduce dependency on the grid, making energy consumers less susceptible to power outages and fluctuations in energy prices

Its main purpose is to use the peak-valley electricity price difference of the power grid to achieve return on investment. The main load is to meet the internal electricity demand of industry and commerce itself, and to maximize photovoltaic power generation for self-use or arbitrage through the peak-valley price difference.

Containerized energy storage systems (ESS) are based on a modular design and configured to meet the power and capacity requirements required by customer applications. Energy storage systems are based on standard shipping containers and range from kW/kWh (single container) to MW/MWh.

Users only need to fix the photovoltaic system on the balcony railing, plug the system cable into the socket at home, and use it with energy storage batteries. A balcony photovoltaic energy storage system usually consists of one or two photovoltaic modules and a micro-inverter, and a battery.