... 230w Polycrystalline solar panel 1,Using high quality Motech solar cell. 2,Certificate: IEC,TUV, CE and RoHS YingLI 230w Polycrystalline solar panelMaterial: ... Multi and Poly CrystalTempered glass Mounted with tough aluminum frameWorking life: ... large or small on-grid or off- grid solar power station.2, Commercial and industrial building roof ...