The tool used to convert sunlight into electrical energy and increase the temperature of solar cells is called a Solar Panel.To convert solar energy into electrical energy, photovoltaic modules are needed. One aspect that effects is the intensity of light. One of the influential aspects of the conversion is the light intensity. The intensity of this light is directly proportional to the value of electrical energy. The greater the light intensity, the greater the energy value produced by the panel and vice versamore light intensity, the more electrical energy the solar panel gets and vice versa. The solar panel will be optimal when exposed to direct sunlight. Optimization of electricity value using flat mirrors as reflector expected directly more sunlight radiation falling on to the surface of the photovoltaic panel flat mirror aims to focus light on the photovoltaic panel. The greather the light received by the flat mirror glass, the higher the output power by the output power obtained by the photovoltaic panel. The calculation of the voltage and current of the solar panels is carried out using a digital is multimeter. The result of the study, the increase in the output power of the solar panel is affected by the suns temperature which has an impact on the performance of thephotofoltaic panel where the difference in the output, photovoltaic panel without using a reflector is 2.31.