PV)-cells/modules demonstrated low performance in hot-humid climates because elevated ambient temperature conditions significantly influence their performance. We investigated analytically the behaviour of BPS150-36 polycrystalline silicon (PV)-modules electrical parameters with ambient temperature under standard irradiation conditions (STC), using Servant model. Matlab and r.getdata have been used for the numerical simulations. Results obtained show that (J Ph ) increases exponentially from 7.67% to 65.87% with temperature. (R S ) increases linearly by 7.6% and 9.18% while (V OC ) decreases from 19.4 % to 17.6% and (R Sh ) decreases approximately by 12.6% and 4.8%. The obtained power output (P) losses had been 82.31 % and 31.56%, and the overall linear losses in efficiency (η) had been approximately 27.84% and 5.02 %, while (J S ) increases exponentially from 3.87% to 15.75%. The increase in (J Ph ) with temperature can be attributed to the increased in light absorption owing to a decrease in the bandgap of silicon. The decrease in (η) with temperature is mainly controlled by the decrease in (V OC ) and fill factor (FF) with T. Power output loss is strongly attributed to the decrease of the fill factor (FF) due to an increase in series resistance (R S ) and therefore caused by the (J SC ) degradation.