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The main objective of this thesis was to evaluate the technical performance of eight small-scale PV (photovoltaic) systems on the Swedish market. Several parameters were measured for each system from June to November 2020. The measured parameters were the inverter's AC output, the plane of array irradiance, ambient temperature, and module temperature. Since faulty data usually emerge in field measurements, the aim of this study was also to filter measured data. Several filtering methods have been applied to remove faulty data such as linear interpolated values, outliers, and abnormal power generation to assure the quality of the data used for the evaluation.  Based on the results in this study, the installation method influenced the module temperature of the systems to a greater extent compared to the module technology. It was found that building applied photovoltaic (BAPV) systems had lower module temperatures compared to building-integrated photovoltaics (BIPV) systems. However, a clear impact of the installation method on the system’s performance could not be observed. Systems 3 and 6 were BAPV respective BIPV systems and they were the best-performing systems in terms of specific energy yield (kWh/kWp) and Performance ratio (PR). The average PR over the period was 89% for system 3 and 91% for system 6. The specific energy yield was highest during June, it was around 135 kWh/kWp for both systems. The results also indicated that systems with mono-Si technology performed better than systems with CIGS technology in terms of PR, specific energy yield, and energy per area (kWh/m2). Among the four studied thin film systems, system 2 which consisted of CdTe was the best performing system in terms of PR and monthly specific energy yield. In comparison to the mono-Si systems, system 2 had an average PR equal to system 7 which had the lowest average PR among the mono-Si systems. Another finding of this study was that a slightly undersized inverter could cause power curtailment during high irradiance intensities.  Nevertheless, power curtailment due to a slightly undersized inverter did not contribute to significant losses in energy.