Solar panels are being increasingly installed on roof tops to generate electricity. This paper analyses the performance of grid connected PV system which consists of 3 case studies for the same plant with different orientations. The importance for the change in the collector plane orientations is briefly analyzed by different case studies. Based on these case studies the optimal tilt angle for the installation of PV plant can be selected focusing on the customer's choice and requirements. The on-grid system will be installed on the top of a 5 staired building. The coordinates of site where the study is conducted are 16.54° N and 81.50° E. The grid connected PV system with a capacity of 39.2 kWp is proposed based on the user's needs. The different field orientations of the PV panel namely fixed tilt, seasonal tilt and N-S axis tracking are defined briefly with losses. The performance of these on-grid photovoltaic systems during an entire year are analyzed and the performance parameters are measured. The data is analyzed by using the simulation software Pvsyst. The different parameters including efficiencies of module, inverter, array's initial yield, final array yield, and the performance ratio of PV system are analyzed for the 3 case studies.