Abstract:In this paper, electrical energy demand (load) of health centre at Ibeno beach in Akwa Ibom, was estimated based on watt-hour energy demand of the electrical appliances in the health centre. The estimated daily load demand is 35 kWh/day with peak load of 7.735 kW. The sea ambient temperature is about 8% lower than that obtainable on land while the wind speed on sea is about 67% higher than the wind speed on land. The cumulative effect of the lower offshore temperature and higher offshore wind speed is offshore PV cell temperature that is about 18% lower than the PV cell temperature on land. The system is designed with 3 days of autonomy and the resultant load demand will be satisfied by 11.41 kW PV modules and 4765.8Ah battery capacity which amounts to 64 units of the selected PV panels and 24 units of the selected battery.

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Photovoltaic (PV) panels' orientation (azimuth angle) and tilt angle significantly affect the energy output of PV power plants. The reason is because the photovoltaic panels produce more electric energy when their surfaces are perpendicular to the sun's rays. Researchers have developed models for estimating the optimal tilt angle for any given location across the globe. In this paper, a site specific model is developed for more accurate estimation of the optimal tilt angle for fixed-tilt angle PV installations at the Ibom E-Library in Uyo metropolis, Akwa state of Nigeria. The solar radiation data used for the study was obtained from the National Aeronautics and Space Administration Surface meteorology and Solar Energy (NASA SSE) website. PVsyst simulation software was used to perform the transposition of the global radiation on horizontal plane to tilted plane. For the location with latitude of 5.123° the existing model estimated the optimal tilt angle as 7.16035° whereas, the site-specific model estimated 11.5° for the optimal tilt angle. The model has prediction accuracy of 99.77% and root mean square error of 0.002567. The optimal tilt angle model can be employed for fixed tilted plane PV installations in the nearby locations.

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