Solar energy storage refers to the technology that captures and holds energy generated from the sun for later use. This is typically achieved using batteries, which store excess electricity produced by solar panels during sunny periods. When the sun isn't shining, stored energy can be used to power homes and businesses, ensuring a continuous energy supply. The most common type of battery used for solar energy storage is the lithium-ion battery, known for its efficiency and longevity. Other options include lead-acid batteries and flow batteries. By integrating solar energy storage systems, users can reduce reliance on the grid and lower energy costs.