This paper presents the current-voltage conditions of the laboratory network photovoltaic system. The work consists of a theoretical and practical part. The theoretical part describes the network photovoltaic system and the way solar energy is applied to the distribution network. In the practical part of the work, measurements of the photoconductor power of the DC and AC side were performed and their comparison was made. With the help of the measurement results, the diagrams and their explanations are presented. The measurements were carried out over a period of five days, with one day missing due to difficulty with the measuring equipment. For the remaining four days, there are views of both sunny and cloudy days, as can be seen from the accompanying diagrams. While in the diagram of sunny days the characteristic is rounded, without large oscillations, on cloudy days the characteristic is variative, that is, with large oscillations. In addition, it is also seen that DC and AC power are not equal, as a result of DC / AC conversion and losses occurring in converter components.