Empirical Model for Estimating Measured Monthly Average Global Solar Radiation in Lawra using TMY Data

In this study, simple and multiple regression models were developed to estimate the monthly average daily global solar radiation in Lawra, Ghana using ground measurement of horizontal irradiance (Nov 2020–May 2022) typical meteorological year (TMY) data (Jan 2017–Dec 2019). Various predictor variables such as sunshine ratio, minimum relative humidity maximum temperature etc. correlated from TMY data. Many model equations with ranging one eight. The best each category was chosen compared statistical indices determine overall model. We used JMP software’s ‘All Possible Models’ functionality select category. selected where then adjusted R-squared, mean absolute percentage error, root square error indices. equation eight independent R-squared 0.99. can be Lawra locations similar climatic conditions is unavailable but have access National Solar Radiation Database’s (NSRDB)