Cable winch as a storage unit for use with the solar power case and the generator bike, with gears and a 12V motor, 5-litre water tank as the load, 2 screw clamps for holding in place on the table, control unit for raising and lowering, 12V normed socket for outputting the stored energy. Conduct experiments to determine and compute the energy which is stored and released, and hence the effi ciency.