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Monocrystalline panneau solaire
Source google image: https://ae01.alicdn.com/kf/HTB11bVSKFXXXXbPXXXXq6xXFXXXd/Cheap-China-Solar-Panel-12v-20W-Monocrystalline-Solar-Charger-Cargador-Solar-For-Home-Panneau-Solaire-A.jpg