Sol Expert 79334, the DoubleLight PET bottle assembly kit, is a solar-powered educational model designed for instructive and exploratory applications in renewable energy systems. This kit includes a solar panel that efficiently converts sunlight into electrical energy, driving a pair of LEDs housed within standard PET bottles to illustrate practical uses of solar technology. The assembled model serves as a tangible example in educational settings to demonstrate sustainable practices and the principles of solar energy conversion, offering insights into photovoltaic operation and energy-efficient lighting systems. Ideal for engineering students and hobbyists, the kit facilitates hands-on experimentation with solar powered devices, promoting an understanding of basic electronics and renewable energy utilisation.