Nature Power Polycrystalline Solar Panels take the sun's energy and turns it into electric current. These solar panels are high efficiency 12-Volt solar panels featuring sturdy aluminum frames and high transparency tempered glass tops. They have a scratch resistant and antireflective coating to help keep the solar panel in good shape for many years. They are rugged enough to be permanently mounted outdoors or even on mobile applications such as RVs and boats. The entire module is sealed against moisture. Designed for charging 12-Volt batteries in off grid applications of any scale a solar charge controller is required to keep your batteries from being overcharged. Designed for use with Nature Power 8 Amp solar charge controller or Nature Power 28 Amp solar charge controller. Installation time is minimal thanks to plug and play connections and included flat mounting hardware. Polycrystalline is the most efficient type of solar cell available on the market letting you get the most power per square inch. More durable than amorphous type solar panels the Nature Power Polycrystalline solar panels are warranted to retain at least 80% efficiency up to 25-years. An optional tilt mounting system is available separately.