This paper presents a novel approach to estimate the maximum power point (MPP) of a photovoltaic (PV) array. The MPP of the PV array is directly estimated from the current-voltage (I-V) curve by using Improved Bisection Method (IBM) under different irradiation and temperature conditions. The five parameters single diode model PV module parameters are estimated from the data sheet values given by the manufacturer under standard test condition (STC). The IBM is simple, fast and returns the MPP more accurately. The estimation of MPP of a PV array under different environmental conditions is presented by using MATLAB program. Also, a comparison of the proposed method with different existing methods has been presented for tracking of MPP of the PV array. It is observed that the estimated MPP of the module is nearly equal to the actual MPP values and thus the performance of the proposed method is more accurate. © 2018 IEEE.