220W pv modules,have TUV,IEC,CE,UL,MCS,ISO have ... coating and gives a uniform dark blue appearance.2) pv modules are extruded by a sheet of toughened imported glass ... appearance and electrical performance of every module are tested to guarantee high quality.6) 220W Solar cell modules ,black panels' size ... 10 years and under 20% decrease within 25 years solar module (TUV,IEC,UL,CE,ISO),black panel