A solar battery works by storing excess energy generated by solar panels during the day for later use. When sunlight hits the solar panels, they convert it into direct current (DC) electricity, which is used to power your home or business. If the solar panels produce more electricity than you need, the surplus energy is stored in the solar battery as chemical energy. This stored energy can be converted back into usable alternating current by an inverter when the solar panels aren't generating power, such as at night or on cloudy days. You must have a hybrid inverter installed or previously installed if adding a battery. Solar batteries typically use lithium-ion technology and are managed by a Battery Management System (BMS) that ensures safe and efficient operation. By storing and later using this energy, solar batteries help reduce reliance on the electrical grid, provide backup power, and potentially lower electricity costs by optimising energy use. 

A variety of battery models are available for solar energy storage, each offering different technologies and features. Lithium-ion batteries, such as the Tesla Power wall and LG Chem RESU. These are popular for their efficiency and scalability. Lithium iron phosphate batteries, like Pylontech and Simpliphi Power, are known for safety and longevity. Flow batteries, including the Redflow ZCell, offer long cycle life, while lead-acid batteries, like Century Yuasa and Trojan, are traditional and durable options. Hybrid systems, such as Alpha-ESS, BYD and Redback, combine inverters and batteries for all-in-one solutions. These choices provide flexibility depending on energy needs, safety, and cost preferences.