Rich Solar panels made with cells Sun Power (SP) range are the most efficient commercially available solar cells worldwide. This range uses standard monocrystalline cells with an efficiency exceeding 22.5%. These panels are used where maximum output is required for a given space. At just 1/8th the weight of a standard domestic panel Rich Solar flexible panels are the ultimate in lightweight flexible monocrystalline solar. The panels are constructed with highly efficient solar cells supported in a unique polymer that allows for flexibility and significant weight reduction. These panels have no aluminium or steel backing like other semi-flexible panels which means they are extremely lightweight. At just 1.5mm thick and weighing from 1kg they are the thinnest and lightest panels available in the world. Do not wire the flexible solar panel in parallel or in series to avoid overheating. Not recommended to glue the panel on top. Leave a space underneath for the back panel to breath.