An Estimation of Solar Characteristic in Kelantan Using Hargreaves Model

One of the famous models in statistical analysis for predicting the solar radiation is using Hargreaves model. In any prediction of the solar radiation, the specific site accurately over the long term is needed. This study presents an estimation of the solar radiation in Kelantan, Eastern Malaysia for the year of 2011 using Hargreaves model. This estimation is based on latitude and daily minimum and maximum temperature in Kelantan. The measured and estimated solar radiation data were compared for the year 2011 and analyzed using coefficient of residual mass (CRM), root mean squared error (RMSE), coefficient of determination (R2) and percentage error (e). The results showed that the value of CRM is 0.09, it indicates the tendency of the estimation model to under-estimate the measure solar radiation. Meanwhile, the value of RMSE is 8.21%. and the value of R2 is 0.8661, closed to 1 indicates that about 86.61% of the total variation is explained in the data. For the e, the value is 7.98%, it indicates that the model estimation is good.