Despite the abundance of solar energy available for residential and commercial use, very little of it is actually captured since the sun’s rays are so unpredictable. Systems for storing thermal energy that make use of both sensible and latent heat may benefit from high temperatures due to their isothermal conductivity during charging and discharging, storage efficiency per unit area, and other properties. These benefits have motivated contemporary researchers to devote a great deal of time and energy to finding solutions to issues like low heat transfer charges. The PCM-based TES system interacts with each cycle of charging and discharging, phase change substance and heat transfer fluid. The present experimental investigation makes use of an internal heat TES system that incorporates both perceptible and changeable temperatures. Solar power generates the heat. Both the TES system 72 mm and PCM mild steel melting occurred at two different rates of HTF flow (3.6 and 9 lit/min). Two chemicals that undergo phase changes are myristic acid and palmitic acid tested in spherical capsules with a diameter of around 0.25 mm. There has to be testing for every possible charging and discharging method run either in batches or continuously. From a monetary perspective, myristic acid is more cost-effective in India than palmitic acid, and it produces more heat than boiling water. Because of these reasons, thermal energy storage devices should use myristic acid PCM.