This paper presents an experimental study of natural convection V-grooved solar heater. Based on the experimental study, the first law and second law efficiencies and entropy generation have been calculated considering the available radiation under the meteorological conditions of Bhubaneswar, Odisha, India. Experiments were conducted during the month of November 2014 to March, 2015 for studying the performance characteristics of the solar air heater. The results obtained are quite significant with respect to outlet air temperature as compared to other solar heaters. The maximum air heater efficiency was found to be 16.91%, calculated at a mass flow rate of 3.55 gm/s of air and the second law efficiency was 6.72%.