One way pump 53, as shown in FIG. 2A, along with the associated pipes and valves, can also be used rather than pump 23.The third phase is shown in FIG. 6 wherein when the sun is shining, such as during the morning hours, photovoltaic panel 3 is preferably used to produce electricity, which in turn can be used to drive compressor 9 to produce compressed air which can be transferred to and stored wi