1. High cell efficiency with quality silicon materials for long term output stability and reliability.2. Strictly quality control the stability and reliability, totally 23 testing procedure to do quality control3. High transmittance low iron tempered glass with enhanced stiffness and impact resistance4. Solar panel connector leads for easy plug and play use!Type: 30W Solar PanelTolerance: +/-5% Battery Voltage: 18VType of Solar Cell: MonocrystallineOpen Circuit Voltage(Voc): 18VMaximum Ystem Voltage: 18VTemperate Coefficient of : (010+/- 0.01 ) %/CTemperate Coefficient of Voc: - (0.38 +/-0.01 ) %/CTemperate Coefficient of Power Voc: -0.47%/CTemperature Range: -40 Celsius to +80 CelsiusColour:blackMaterial:Monocrystalline siliconSize:280 x 380 x 2.5mmPackage Contents:1 x 30W Solar Panel1 x Connector CoverOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.