The objectives of this study were (1) To determine the effect of using passive reflectors and coolers on the output power produced by solar panels. The research method used was an experimental method with a true experimental design model, namely in this design there were 2 systems, the first system was treated, the second system was not given treatment. The variations in treatment in this study are as follows; (1) Solar panels without using passive cooling reflectors and (2) Solar panels using reflectors and passive cooling. Data were collected for 4 days from (08.00-14.00) with a sample of 50 Wp solar modules. The data collection technique used was literature study, performance and testing documentation. The results showed that the results of the solar panel testing power with 2 variations of treatment, namely, (1) The solar panel without using a reflector and passive cooling produces an average power of 47.68 Watts and (2) Solar panels using a reflector and passive cooler are 59.63 Watts. The results of this study indicate that solar panels using reflectors and coolers increase the power by 25.07% of solar panels without using reflectors and passive cooling.