Patent ID: 7607427

Claim:
A solar tracking device comprising: a solar module or solar collector adapted to concentrate solar energy, with the solar module or solar collector having first and second ends; a fulcrum located between the first and second ends of the solar module or solar collector to revolve eastward or westward; a first water tank mounted on the first end of the solar module or solar collector and having a first inlet and a first outlet; a second water tank mounted on the second end of the solar module or solar collector and having a second inlet and a second outlet; a first spring secured to and supporting an underside of the first end of the solar module or solar collector, with the first spring compressing as the solar module or solar collector pivots about the fulcrum with the first end moving down and the second end moving up; a second spring secured to and supporting an underside of the second end of the solar module or solar collector, with the second spring compressing as the solar module or solar collector pivots about the fulcrum with the first end moving up and the second end moving down; and an angular movement measuring member mounted at the fulcrum for measuring tilt angle; whereby filling water into the first water tank and draining water from the second water tank under the control of the angular movement measuring member will compress the first spring and expand the second spring, filling water into the second water tank during an afternoon period and draining water from the first water tank during a morning period under the control of the angular movement measuring member will compress the second spring and expand the first spring, and compression of the springs will move the solar module or solar collector so as to provide a solar tracking device without motors for a solar energy system.