This paper presents a novel approach to transform the implicit current-voltage (I-V) expression of a double-diode model (DDM) of a photovoltaic (PV) module into an explicit expression. This is achieved by using the Taylor Series expansion of the exponential term in the I-V expression of a DDM PV module. The derived explicit expression is validated against the implicit expression for three different PV modules under different environmental conditions (DEC). The maximum power point (MPP) is estimated using the simple and computationally efficient Bisection method, using the derived explicit expression. The proposed method is then compared with other MPP estimation methods under DEC. The results obtained from the comparison indicate better accuracy of the proposed method. To further validate the results, the proposed method is compared with experimental data collected from KC200GT PV module. © 2020 IEEE.