This book helps the researchers and industrialists working on hybrid solar thermal systems. This books shows basic path for the upcoming researchers to identify the problem in the solar PV thermal systems. The sum radiated energy is extracted b two individual systems such as PV and Solar thermal systems. This book presented a novel approach to utilize both light and heat energies in a single module. In this proposed a novel method to estimate the PV module temperature by Adaptive Nuero Fuzzy Interface System (ANFIS). The energy analysis of different PV/Thermal (PV/T) system configurations are presented. The mathematical model of commercially available PV module and commercially available Thermoelectric Generator (TEG) module are simulated in the MATLAB environment.