Patent ID: 8378521

Claim:
An energy storage device wherein energy from an array of solar cells is storable in a main storage, in particular a hydro-pneumatic storage or any other main energy storage means such as a battery or a flywheel, and in an auxiliary storage comprising an array of supercapacitors, wherein the main and auxiliary storages are alternately operable in first and second charging sequences, wherein in the first charging sequence the main storage is disconnected from the solar cells and the array of supercapacitors is charged from the array of solar cells, and in the second charging sequence the main storage is connected to be charged by the array of solar cells while the array of supercapacitors discharges, the main storage and auxiliary storages being connectable to an AC or DC network, characterized in that the array of solar cells is connected via the array of supercapacitors to the AC or DC network.