<p>As the globe struggles to mitigate the effects of climate change, there is a greater need than ever for renewable and sustainable energy sources. Because renewable energy comes from nature and has an endless supply, it is becoming increasingly popular worldwide. Egypt is an equatorial country with year-round sun radiation, making photovoltaic PV an appropriate clean energy technology. The design of PV systems for an Egyptian private school building was suggested in this paper. It addresses a practical need for renewable energy solutions in an educational setting. This off-grid setup comprises the inverter, battery storage, and photovoltaic panels. Utilizing SketchUp for design and PVsyst for simulation demonstrates a data-driven approach. With a solar energy system, the maximum peak daily energy requirement is 163 kWh. Depending on the design calculation, the PV modules are set up in 10 parallel strings, each consisting of 8 modules in series; there are 80,200 Ah 12 V batteries and 11 5 kV100A 48 V inverters per string. The PV system's maximum energy production of 7.957 MWh was recorded in May, while its lowest figure was 4.429 MWh. December and January have the highest performance ratio of 85%, while June and July have the lowest 50%. For most of the year, the average sunlight fraction is 97%. The proposed system's overall cost, as determined by the bill of quantities, is 978,875 EGP. Over a 25-year system life, the total energy generation is 1,783,014 kWh. The system's energy cost is 0.54 EGP/kWh (0.018 USD/kWh), and the proposed system will take 3.6 years to pay for itself. If The cost of electricity from wind energy system is compared to this proposed system; it is found that cost of energy is about 0.03 USD/kWh. The cost of electricity generated from diesel generators is about 3.8 times higher than the cost of the proposed system. These outcomes provide access to an environmentally benign energy source for private school buildings and yield the biggest annual cost savings.</p>