... OEM accepte TUV, ISO, IEC,CE Poly solar panel high quality and cheap solar panel Electrical Characteristics: Maximum power at STCPmax 20WOptimum ... standard output.3.High efficiency, good quality.4.High transmission tempered glass.5.Rugged design to withstands high wind pressure and snow load, easy ... module output warranty.9.Built-in diode prevents reverse charging high quality and cheap solar panel