A prototype control system for a PV power plant was constructed with the movement following the position of the Sun, where the position control takes place in two planes. The principle of operation is based on comparing the voltage values of small PV modules constituting the measurement system. With the use of this stand, the dynamics of changes in light intensity as a function of electricity production using a PV cell was analyzed. The value of energy from two PV cells was compared with the determined efficiency index as the ratio of energy obtained from a follow-motion controlled PV cell to the energy obtained from a stationary cell. The amount of energy generated from the follow-up PV system in the analyzed period exceeds the stationary system in the range from 5% to 74%, depending on the climatic conditions on the observed day.