More compact than ever, the Renogy Bifacial 320-Watt monocrystalline solar panel is perfect for the beginner or experienced solar user. Unlike traditional single-sided glass panels, this solar panel is made with a transparent mesh backsheet material that allows for double-sided power generation in real-world use. (i.e. both front and back side together) You can get an additional 5%-30% of power generation compared to traditional solar panels. (Additional power generation depends on the installation environment)The panels feature lightweight aluminum frames andAnti-reflective, high transparency, low iron-tempered glass making them perfect for outdoor applications. It comes with pre-drilled mounting holes, solar connector leads, and a junction box. Allowing you to install, connect it to a controller, or expand with panels without breaking a sweat. The panels are made of premium Grade A+ monocrystalline solar cells that are more efficient than conventional polycrystalline solar cells. Since 2010, Renogy has gained rich experience designing and manufacturing the most efficient and robust solar panels and complete off-grid solar systems. Renogy's focus on testing, quality control, and traceability ensures our solar power system offers industry-leading reliability. Invest in yourself by going Renogy. Renogy solar panels will be your most economical long-term investment yet.