The Centre for Renewable Energies of the National University of Engineering of Peru (CER-UNI) and the Research and Development Group in Solar Energy (IDEA Group) of the University of Jaen - Spain have elaborated the present work that is based on the installation, instrumentation and monitoring of two Grid Connected Photovoltaic Systems at UNI, one with crystalline PV modules and the other with second generation PV modules of thin film, with amorphous microcrystalline tandem technology. An energy characterization of both systems has been made according to IEC 61724-1: 2017 norm, using two procedures: First, plotting the I-V curves of both PV generators and transferring the measured maximum power data to Standard Conditions, SC, using the methods of Evans Osterwald and Constant Form Factors. Then, the Power at SC of the PV generators and the complete systems was obtained under the protocols of the Solar Energy Institute of the Polytecnic University of Madrid, and validated by the IDEA group of the University of Jaen. Finally, the results obtained were analysed and the most relevant conclusions of the work are reported.