There are various methods and technologies to store various forms of energy. The choice of energy storage technology is typically dictated by application, economics, integration within the system, and the availability of resources. And they are often used as Residential Energy Storage System or Commercial Energy Storage System for Outdoor Power Supply. Energy storage systems are also involved in converting energy from forms that are difficult to store to forms that are more convenient or economical. http://www.suntrver.com/residential-energy-storage-system/