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This work sets up four photovoltaic (PV)-based solar power systems with adjustable solar panel inclination angle stands. It also varies the inclination angle of the solar panel every five days while recording daily energy delivered by the panels. The study finally compares the output energy recorded for different angles. This was done with a view to studying the effect of building roof inclination on the energy deliverable by solar panel installed on it. The set up consists of PV-based solar power systems with adjustable inclination angle stands for four 10 W solar panels which are on the same axis. Each solar panel was connected to a 42 Ah battery through multimeter and charge controller. A 25 W load was used to discharge the battery at night to allow fresh charge from the panels during the day. The multimeter was used to monitor the daily energy delivered. The solar panels were subjected to 0°, 25°, 50° and 75° inclination angles and faced to South direction at the Renewable Energy Laboratory, Osun State University, Osogbo, Nigeria. Data were recorded daily for 20 days by subjecting all panels to the considered angles for five days. The results obtained showed that the average energy delivered by panels installed at the stated inclination angles are 35.35 Wh, 32.25 Wh, 24.1 Wh and 13.95 Wh, respectively. This means that, for a specific building energy need, the steeper the roof (intended for panel installation), the more the amount of solar panel required to meet such energy. The results also showed various expressions that can be used to estimate daily average sun hour (ASH) based on roof inclination. For example, the estimated daily (ASH) for Osogbo and environs can be taken to be 4.22 hour, 3.15 hour and 1.82 hour for 25°, 50° and 75° roof inclinations, respectively.
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 An Assessment of Solar Energy Conversion Technologies and Research Opportunities. [online]. Available:https://gcep.stanford.edu/pdfs/assessments/solar_assessment.pdf.
 Hussein H., Ahmad, G. & El-Ghetany, H. (2004). Performance Evaluation of Photovoltaic Modules at Different Tilt Angles and Orientations, Energy Conversion Management, 45, 2441-2452. https://doi.org/10.1016/j.enconman.2003.11.013
 Poulek, V.,Khudysh, A. & Libra, M. (2016). Self-Powered Solar Tracker for Low Concentration PV (LCPV) Systems. Solar Energy, 127, 109–112. https://doi.org/10.1016/j.solener.2015.12.054
 Mishra, J., Thakur, R. & Deep, A. (2017). Arduino based Dual Axis Smart Solar Tracker, International Journal of Advanced Engineering Management Science, 5, 239849. doi:10.24001/ijaems.3.5.20
 Hailu, G. F. (2019). Optimum Tilt Angle and Orientation of Photovoltaic Thermal System for Application in Greater Toronto Area, Canada. Sustainability, 11, 6443. https://doi.org/10.3390/su11226443
 Mondol, J.D.,Yohanis, Y.G. & Norton, B. (2007). The Impact of Array Inclination and Orientation on the Performance of a Grid-connected Photovoltaic System. Renewable Energy, 32, 118–140. https://doi.org/10.1016/j.renene.2006.05.006
 Božiková, M.,Bilčík, M.,Madola, V.,Szabóová T., Kubík L., Lendelová, J. & Cviklovič, V. (2021). The Effect of Azimuth and Tilt Angle Changes on the Energy Balance of Photovoltaic System Installed in the Southern Slovakia Region. Applied Sciences. 11(19), 8998. https://doi.org/10.3390/app11198998
 Udoakah, Y. N., & Okpura, N. I. (2015). Determination of Optimal Tilt Angle for Maximum Solar Insolation for PV Systems in Enugu-Southern Nigeria, Nigerian Journal of Technology (NIJOTECH), 34(4), 838 – 843. DOI: 10.4314/njt.v34i4.24
 Mamun, M.A.A., Islam, M. M., Hasanuzzaman M. & Selvaraj, J. (2022). Effect of Tilt Angle on the Performance and Electrical Parameters of a PV Module: Comparative Indoor and Outdoor Experimental Investigation, Energy and Built Environment, 3(3), 278-290. https://doi.org/10.1016/j.enbenv.2021.02.001
 Shareef, S.J.M. (2017). The Impact of Tilt Angle on Photovoltaic Panel Output, ZANCO Journal of Pure and Applied Science, 29(5), 112-118. doi:10.21271/ZJPAS.29.5.12
 Hasan, D.S., Farhan, M.S. & ALRikabi, H.TH.S. (2023). The Effect of Irradiance, Tilt Angle, and Partial Shading on PV Performance, AIP Conference Proceedings, 2457, 050008 (2023); https://doi.org/10.1063/5.0120692
 Som, T., Sharma, A. & Thakur, D. (2020). Effect of Solar Tilt Angles on Photovoltaic Module Performance: A Behavioral Optimization Approach, Artificial Intelligence Evolution, 1(2), 90-101. https://doi.org/10.37256/aie.122020505
 Cano, J., John, J.J., Tatapudi, S. & Tamizh-Mani, G. (2014). Effect of Tilt Angle on Soiling of Photovoltaic Modules, in Proceedings of the IEEE 40th Photovoltaic Specialist Conference (PVSC), Denver, CO, USA, pp. 3174-3176. doi: 10.1109/ICMEAS52683.2021.9692375
 Ajao, K.R., Ambali R.M. & Mahmoud M.O. (2013). Determination of the Optimal Tilt Angle for Solar Photovoltaic Panel in Ilorin, Nigeria, Journal of Engineering Science and Technology Review, 6(1), 87-90. doi:10.25103/jestr.061.17
 Abdullateef, A.S., John, A.O., Alexander, O.O. & Ibrahim, A.A. (2022). Evaluation of the Optimum Tilt Angle of a Monocrystalline Module and Performance in Anyigba Kogi State-Nigeria, Journal of Technology Innovations and Energy, 1(3), 28-32. doi:10.56556/jtie.v1i3.256
 Badamasi, Y.A., Oodo, S., Gafai, N.B. & Ilyasu, F.B. (2021). Effect of Tilt Angle and Soiling on Photovoltaic Modules Losses, in Proceedings of the 1st International Conference on Multidisciplinary Engineering and Applied Science (ICMEAS), Abuja, Nigeria, pp. 1-5. doi: 10.1109/ICMEAS52683.2021.9692375
 Google. (n.d.). Location of Osun State University, Osogbo Campus on Map. [Online]. Available:https://www.google.com/maps/place/Osun+State+University/
 Marsh, J. (2022). What’s the Best Direction and Angle for my Solar Panels?. [Online]. Available:https://news.energysage.com/solar-panel-performance-orientation-angle/
 Lawal, M.O., Bada, M.O., Ajewole, T.O. and Ashaolu, S. (2022). An experimental Approach towards PV-Based Solar System for an Engineering Laboratory, Tanzania Journal of Engineering and Technology, 41(2), 98-108. DOI: 10.52339/tjet.v41i2.783