Abstract: Solar collection systems are provided herein that includes a mobile, self-tracking receiver support member which is suspended from a support beam spanning the two sides of an immobile solar trough concentrator. The self-tracking receiver support member has photovoltaic cells of equal power affixed to two or more downward facing surfaces of the support member. These photovoltaic cells face downward into the solar parabolic trough concentrator and respond to the concentrated light of the path of the points of focus being reflected upwards from a parabolic concentrator. The solar cells are wired to a DC electric motor so that the motor rotationally responds to the disparity in the power output of the solar cells. As the path of the points of focus of the solar concentrator moves to one side or the other of the center of the self-tracking support member, the motor automatically moves the support member, along with and the receiver it is carrying, into the parabolic concentrator's path of the points of focus.