These panels come to us from Voltaic Systems, makers of fine solar-powered bags and packs. These are waterproof, scratch-resistant, and UV resistant, and they use 12 high efficiency monocrystalline SunPower cells with 22+% efficiency (praise the sun!). Each cell has a nominal voltage of 0.5V so we call this a "6V" panel https://elecena.pl/product/20221971/6v-2w-solar-panel-etfe 2022-02-02 https://elecena.pl/product/20221971/6v-2w-solar-panel-etfe 2023-09-08