Tracking of Maximum Power Point of a PV panel or PV panel array is of essential importance for yielding high energy outputs from solar energy power systems. MPPT (Maximum Power Point Tracking) is utilized by on grid inverters and charge regulators in order to make the system operate with maximum efficiency. The main mission of the MPPT is to adopt the operating point of a module or array usually modifying the output voltage in order to adapt the system to different irradiance conditions and also temperature variations. Within the scope of this study a wide range of MPPT techniques have been investigated. Among all methods investigated much focus has been on Hill Climbing and Perturb and Observe methods. This paper outlines different versions of both method and discusses the advantages and disadvantages of each technique. It overviews the main shortcomings of those two conventional methods.