While the Rooftop Solar PV systems are reaching towards the grid parity, some of the new developments in the battery storage technologies are helping the consumers to go off grid and become completely independent on the grid electricity. Storage technologies are currently expensive and many companies are striving hard in the cost reduction of storage technologies. There are various storage technologies are being explored which include the chemical, thermal, mechanical, bulk and gravitational methods, etc.
Recently a US based firm Aquion Energy has introduced battery storage technology which are much cheaper and at par with the conventional Lead acid battery however the life is double than the lead acid battery. The batteries are scalable for a wide range of interior configurations. These battery storage systems are non-flammable and non-explosive, and can operate over a wide temperature operating range.